Graphite as a Dry Lubricate? Answered

I know that graphite is sometime used as a dry lubricant, can I just use ground graphite from pencils or is there more too it?  Presumably the finer the better, is softer or harder 'lead' better  (4H HB 2B etc.) Expert advice appreciated,  - Tom

Question by madmanmoe64 8 years ago  |  last reply 7 years ago


will graphite pencils hurt a microecosytem ? Answered

And if it does i want to know how and why it's becuase i want to know sometimes in life we got to consiter what could happen in the future in case it happens please show your source its okay if you do not know where its from just let us know please include references that can be search& researched please take it easy on the comments i have not asked a question in a long time on this site

Question by 35Timmy 6 years ago  |  last reply 6 years ago


expanded graphite heat-sink? Answered

Okay , I've searched and searched and cannot find what I'm looking for. Maybe the other diy'ers can help me. 1.What I'm looking for is a heat-sink made of expanded graphite or (carbon, graphite (∥) as it might be known as well) that is actually in the shape of a traditional aluminum heat-sink with the fins and NOT in the shape of thin film as it is very commonly available. I don't even know if it exists or is manufactured by any company. I've tried contacting some companies about it but they have yet to get back to me. The reason I want this is for the tremendous increase in heat conductivity as in this chart shown on this webpage http://physics.info/conduction/ . The application I am trying to use it for needs a raised, elongated surface area to displace heat semi-uniformly, hence why I need fins like a traditional heat-sink instead of the commonly available film expanded graphite online. 2. If it does exist or is able to be manufactured, would it be a ridiculously priced part or would it be a reasonable priced part? (Just doing small scale tests for now so it would be the size of a FET finned sink). 3. From what I've read it seems possible by maybe layering the films into a stacked lattice, keeping heat transfer perpendicular to the lattice, but what are your thoughts all? (I question bonding the layers myself but I don't know if you could hard press the layers together without a bonding agent since any bonding agent being used I believe would reduce the thermal conductivity quite a bit, but I'm not incredibly familiar with expanded graphite). Any and all help would be appreciated from this wonderful community Best regards, Velesh

Question by velesh 6 years ago  |  last reply 6 years ago


How to make a graphite arduino piano?

Hey frnds! I got inspired by this project:    https://www.instructables.com/id/Graphite-Controlled-Step-Sequencer/      and a new project came in my mind which will use arduino but i'm not good at programming. As in the above mentioned project the graphite worked as a variable resistor. Is there a way to use this resistor with arduino to play different tones at different resistivity from the "pitches.h library". I know there can be. So plz if anyone know kindly give the program.

Question by SnehilSensei 4 years ago  |  last reply 4 years ago


Convert Crayons into 2mm+ Leads Like Graphite Lead

Hello! I want to recycle crayons and thought of converting them into 2mm lead or larger in diameter (since there’s only a certain thickness where crayons can be sturdy). I also thought the crayons should be mixed with something since they’re wax. I was thinking of buying a silicone mold rubber to make a mold (may make the lead bend since it’s flexible but easy to remove), a polyurethane mold rubber, or a protruder like the old fashioned way. Silicone mold rubber is expensive ($30+). I originally thought of it as a craft, but it’s too complicated for a craft. Thank you for your time!

Topic by TrixiaL 1 year ago  |  last reply 1 year ago


Would it be possible to make a cold heat toaster using pencil graphite strips? Answered

I am thinking of making a bread toaster using graphite rods which would heat up when a high current is applied to them. How would I go about doing this? What voltage would I need to use to supply it?

Question by lardbob 9 years ago  |  last reply 9 years ago


Source for long carbon fiber / graphite tubes?

Hello everyone, I am trying to help a friend who is searching for graphite tubes, exact measurements are negotiable but he's looking for 5/16" x 72-84". I've searched all the slightly off the beaten path places I could think of, including kite making supplies, fishing rod building supplies and so forth... is this going to have to be custom made? Thanks!

Topic by Grundal 11 years ago  |  last reply 11 years ago


Make supercapacitors from graphite in a DVD burner

The outline is that you can deposit graphite oxide (a cheap bulk material) onto a film of PET (the plastic used in Coke bottles), hit it with a commodity infra-red laser (such as the one in a $30 LightScribe DVD burner) and end up with a form of activated carbon material that can be used as the electrode in an electrolytic capacitor.  Add some aluminium foil, separator membrane and electrolyte and you've got cheap, robust energy storage.  The headline numbers are a few hundred milliFarads per cubic centimetre at a few volts, which works out to 1.36kWh per cubic metre of stacked capacitors.  It's still about 50 times less energy per volume than lead acid batteries, but you could store as much energy as your house will need overnight in the size of a garden shed or a set of bunk beds.  They charge/discharge in seconds and retain >95% capacity at 10,000 cycles so seem suitable for storage to even out intermittent energy generation from, for example, solar or wind power. I'm really thinking about cost here- unless I'm missing something fundamental it doesn't seem like producing these on a high volume roll-to-roll process would be excessively difficult, and the cycle life means the replacement time would be many years even in heavy usage.  Could you get sufficient kWh per dollar to make these a viable storage mechanism for home-scale renewables? There's a more informative article here.

Topic by PKM 7 years ago  |  last reply 7 years ago


Show off your drawings!!!

Though there's no members at the moment I figured I'd go ahead and start a topic. In this one, just post pics or scans of some of your drawings. Here's three of mine:

Topic by LoneWolf 9 years ago  |  last reply 8 weeks ago



Removing rust from the inside of a motorcycle gas tank using the electrolysis method? Answered

Which is better for removing rust from the inside of a motorcycle gas tank using the electrolysis method? Steel anode or carbon graphite anode? I have tried both. I like the carbon graphite better. It seems to be a cleaner process and to work just as good as the steel anode. Should I use 12 volts or 3 volts? Does a pulsating DC work better than a continuous DC? What is the best amperage?

Question by Goldwingracer 6 years ago  |  last reply 6 years ago


What metal doesn't react with sodium? Answered

I am trying to make sodium. I used graphite and copper wire at the anodes and cathodes. Both of them combine with the sodium and corode. That leaves me with 0% sodium.

Question by chinarian 8 years ago  |  last reply 8 years ago


What i should buy?

A Nokia C3 Graphite or a Samsung S5350 Shark black? I know all the features of those phones but what i should choose  and why???I dont care about the price.

Question by hellrider75 8 years ago  |  last reply 8 years ago


pdf file does not download

I  cannot download the pdf file from: https://www.instructables.com/id/Graphite-Controlled-Mono-Synth/ I have tried a different browser and get the same problem. Thanks

Topic by marcorexo 6 years ago  |  last reply 6 years ago


What Do You Like To Draw?

What type of art do you do? (i.e. painting, sculpting, pastels, graphite, charcoal etc.) What do you like to draw? (i.e. landscapes, animals, people etc.) 

Topic by LoneWolf 9 years ago  |  last reply 3 years ago


Printing Graphene?

Has anyone tried this? I have a lightscribe. Looking at the video it seems that all I need is some graphite oxide. I tried embeding the video but I don't think it is going to work. Here is a link to the video. The Super Supercapacitor | Brian Golden Davis from Focus Forward Films on Vimeo.

Topic by ehudwill 6 years ago  |  last reply 5 years ago


Help me identify this stuff??????

I found it in my treasure box i dont know what it is but thar black rod that looks like carbon or graphite is having very high magnetic properties i think that is a metal used to make very strong electromagnet i cant remember the name and not sure that it is that metal                                      PLEASE HELP!!!!!!......

Question by Atul009 6 years ago  |  last reply 6 years ago


Voltage vs. Ampage (electrolysis of water) Answered

I want to electrolyze water.  I am currently using a 12V adapter power supply with graphite electrodes.  I want to increase the process.  Which would do it better: more voltage or more ampage?  I suppose more of both is best.  Thanks in advance for answering my question!

Question by Valos_Cor 8 years ago  |  last reply 1 year ago


DIY Rechargeable Cell Chemistry?

Hi i was wondering if there was any electrically reversible battery chemistries that can be made from around the house materials like copper wire, iron nails, galvanized nails, graphite rods, aluminum foil, and other items like those.

Question by LiquidLightning 8 years ago  |  last reply 6 years ago


Can a new lock need lubricated?

I had new locks put on my house.  A few months after they were installed, we had troubles getting the keys to unlock them.  I put some powder graphite in them and the locks seems to work fine.  I have been told however since the locks were new they should not have needed lubricated?  Is this true?  Or could the locks be bad and need to be returned?

Question by kyboy03 8 years ago  |  last reply 8 years ago


Can someone help me make a conductive (resisitive) paste?

I need to make heater using about 6K resistance working off the mains vltage of 240V ac (i.e., about 40mA or 10Watts). Is it possible to make a resistive paste perhaps using graphite and some glue (pl suggest glue) for this application? I can then screen print the paste on the surface to be heated. The result needs to be consistent over about 200 pcs. Thanx in advance.

Question by n6080 8 years ago  |  last reply 8 years ago


need a driver for gameport to usb adapter?

I have a Gravis Blackhawk Digital joystick that plugs in via gameport. I want to use it on my Compaq Presario c500 to play a game that I need two joysticks for. The other joystick that I am using is a usb Cyborg Graphite joystick. it works just fine. I used to have the Blackhawk  working when I ran windows vista on this computer but it hasn't worked since I upgraded to windows 8. I connect the controller using a gameport to usb adapter that I got cheap off of ebay a while back. I have been searching the internet for a couple days now and cant find anything that will make it run. I cant even get an xp machine to recognize it when it is plugged in with this adapter. can someone please provide me with a solution of some kind or a driver. thanks

Question by tvsamuel 5 years ago  |  last reply 5 years ago


soldering alternatives - conductive glue, soldering paste ...?

------------------------------------------------------------ SOLDERING ALTERNATIVES - CONDUCTIVE GLUE/SOLDERING PASTE ... ? i am looking for a reliable, not-too-expensive alternative for soldering connections & found conductive glue/paste products as listed in the following; .... i assume that there is nothing that really replaces soldering but would like to know, if you probably tested any of these or may recommend a specific product suitable for "sticking" components onto pcb's ... any hint is highly appreciated! ------------------------------------------------------------ PRODUCTS http://de.rs-online.com/web/c/?searchTerm=loet+paste&sra;=oss solder paste/solder glue ... based on silver http://www.ponoko.com/make-and-sell/show-hardware/2201-a-solder-paste-50g-leaded?source_node=ponoko_united_states#main-image solder paste ... needs heat to harden out, cheaper than silver based glue http://www.thinkgeek.com/gadgets/tools/b70c/ "Wire Glue" ... does not need heat to harden out, based on graphite powder, cheapest of all i found so far https://www.instructables.com/id/Make-Conductive-Glue-and-Glue-a-Circuit/ ... selfmade, based on graphite powder ------------------------------------------------------------ TESTS/RATINGS/COMMENTS http://forums.reprap.org/read.php?70,21723 "Wire Glue" ... it's consistence might be too brittle, using additional expoxy might make up with this issue

Question by marc_is_curious 7 years ago  |  last reply 2 years ago


Help with a small LCD display? Answered

(Refer to picture below) I've got this watch, but due to space restrictions for this particular project I'm doing, I can't mount it as it was, it's kinda too thick. Can anyone offer ideas as to how I could make a good electrical connection to those black pads on the LCD screen? I don't even know what they are made of (...graphite...?). I can find old ribbon cables from other LCD displays, but I dunno how to connect them to this. Thanks in advance

Question by .Unknown. 7 years ago  |  last reply 7 years ago


DIY Railgun?

Hey guys, I recently built a coilgun and want to move to something bigger, namely a portable railgun. Check out this link: https://www.youtube.com/watch?v=xqxB6I6rooI I want to do something similar, perhaps in pistol form. I have more power (450v 1120uF) than the one in the link and have graphite to use as projectiles. What kind of range can I expect? And how powerful could it be? Can it be done? The requirements seem pretty simple.. (If I make it, Instructable coming soon!) Thanks. BTW I have lots of experience dealing with high voltage.

Question by IndianHacker002 3 years ago  |  last reply 3 years ago


Is there a ceramic extruding head for a 3D printer application?

I have followed the evolution of the 3D printer and I can see its potential as a real tool for home use. Ceramic krafts have been a fairly easy home size cottage kraft for centuries. Now If you had a small kiln and you were able to model Items from house wares to mechanical parts to ceramic molds (ie Cookie or decrotive bread pans or a Ceramic motor block to an Air Motor). I thought if you Cure/ dry it (ceramic paste) as it was extruded on to the model with focused lasers (ready for deburing and then a bisque firing) as in using lasers for curing/ hardening of a polymer mediums. The variety of Ceramic Mediums/ materials that could be used to fuel a boon to the unemployed as a way to make money. Maybe printing out one use molds, to form cores to Graphite products that could be washed out after and have the mold material reused. If there was away for me to follow through with the possibilities. Extruding those oven cured clays, that could stretch its usefullness. I am trying to figure out a way to get out from under the pile and recycle as much as possible and use as many American made parts and electronics as I can. Graphite fiber empreganted ceramic material, is there such a product out there that could be utilized in 3D printed parts? Is there a Market for Products made of these types of materials? So many questions, so many possibilities.

Question by bigfoot03242 7 years ago  |  last reply 6 years ago


Silver recovery from photographic fixer solution at home level.

I wa trying to recover silver from photographic fixer solution using home made electrolysis unit having 12v and 3 ampere DC source, small graphite, and stainless steel dinning plate, plastic container of 25 L size.  But, after 6 hours, i was unable to get  the expected more than 60gm silver. in fact i get nothing at all. Why it went wrong? what is wrong with the anode, cathode, power voltage and amperage, volume of fixer used, NaOH added---? With regards!!!

Question by dese 7 years ago


Cold fusion experiment

I have reproduced some experiments on Cold Fusion. not as a source of energy but how to blend a wire of iron from 2mm with less than 2 ampere or obtain gas fuel from the water and graphite (coh4) without using dozens of amps.Do you think may be is interesting to do an instructabels to the matter? are not my nventions!I have same video of this experiment on my youtube channe http://www.youtube.com/user/alessiof76 Almost all in Italian language.. but with a little explanation also in EnglishThe power supply that i use and the experiments can be dangerous.. I would not like someone to dye !

Topic by alessiof76 10 years ago  |  last reply 3 years ago


Another Baby Bear knife

I found some more metal and decided to make a third Baby Bear knife. Thanks to Alan Folts for the original design. He sells these now and I did not like the price, so I decided to make my own. Here is a picture of the semi-finished knife. It has curly(flame) maple handles that I found in the wood pile. I would like to make a Kydex sheath for it, but have not found a source that will let me buy a few or one sheet  at a good price. Still looking. Anyone know of a good source please let me know. I only need a few sheets to start with. Carbon graphite looks cool.

Topic by triumphman 7 years ago  |  last reply 7 years ago


Tactiontape - Touch Sensitive Tape for Rapid Prototyping

Hi everyone, Tactiontape is a one-dimensional touch sensor that curves. It's designed to make building interactive physical prototypes easier, even ones with non-planar or complex surface geometry. It functions as a flexible potentiometer and uses a strip of graphite to express a linearly resistive electrical signal, one that corresponds to how far along the tape you've touched. Each sensor is hand-made using materials from an art supply store. Here's a demo: http://www.youtube.com/watch?v=0ggYn70TpZY For purchasing, photos, and more detail: http://www.etsy.com/listing/87989636/tactiontape-curved-touch-sensors-for

Topic by davidholmandotme 7 years ago


Stirling engine displacer design? Answered

I am designing a gamma Stirling engine (this type) and I am unsure how long the piston should be and how long its stroke length should be the specs for the cylinder and piston pipes are below. The pipe for the cylinder is stainless steel. Wall thickness: 1.56mm Outer diameter: 31.7mm Inner diameter: 28.6 Length: 200mm (can be cut smaller) (Stainless steel cap will be welded to one end, the other end where the shaft comes out will be plugged with this nylon/graphite stuff) The pipe for the displacer piston is aluminium pipe.  Wall thickness: 1mm Outer diameter: 27.88mm Inner diameter: 25.88mm Length: ? (Two aluminium plugs will be used to seal its ends) How long should the piston, cylinder and stroke lengths be based on the specs?

Question by The MadScientist 7 years ago  |  last reply 7 years ago


Waterproof Leads

Hi guys! So i was done with this instructable: https://www.instructables.com/id/Water-Level-Indicator-with-Alarm/ Everything is working perfectly except for one small problem: our best friend, CORROSION The wires that go into the tank are getting corroded. Its forming greenish layers(i assume copper oxide) and after reduces conductivity and also after a while, it washes away with water. I want to attach a metal, which is more resistant to corrosion, to the wires so that i can seal the wires themselves and only expose the metal leads, and since they conduct electricity, my indicator will work fine. The only problem is : WHICH METAL? I have no idea which metal i should use. Anybody suggest something which is commonly available and resistant towards corrosion? Also, can i use graphite leads, the one they use in pencils? Or will it cause any problems?

Topic by charmquark 6 years ago  |  last reply 6 years ago


How to identify a metal ?

Hi ! Into a terrain near a very old volcano and a river, my brother found fragments of obsidian of various sizes and colors. Some of them are "glued" to metallic stones, and some others contain marbles of metals ... He also found a heavy metallic rocks (encrusted with obsidian) who reacts with magnet, and an other light one (without obsidian) who does not react with magnet. Do you know a mean to identify those metals ? (I Googled but found nothing very useful so far) Or do you have a clue of what it could be ? #1 is a metallic rock encrusted with obsidian. It must be iron because it's heavy, the rust is red, and it reacts to magnet. #2 and #3 is obsidian with marble of metal who reacts to magnet. #4 is an unknown (metallic ?) rock. It is light (150 grams for 200 cm3 - 0.33 pounds for 12 cubic inches), of the color of silicon (or the graphite of paper pen !), does not react to magnet but is (electric) conductor with resistance near 0 ohm.

Topic by chooseausername 11 years ago  |  last reply 11 years ago


All right, let's clear this up: What the hell is inside of a battery?

Really frustrating: I accidentally closed the tab I had been working on for about 15 minutes, so I'll probably be missing a couple of questions I had been meaning to ask.So anyway: When I peel off the outermost metal covering of a zinc-carbon battery, I'm just taking away a protective steel covering, right? When I get rid of that, am I looking at the actual zinc "case?"What is the sticky, black material that surrounds the graphite rod? Is that manganese dioxide? Is manganese dioxide the same thing manganese oxide?Further outwards from the center of the battery, there is another black substance. Is this ammonium chloride?I haven't actually chopped open a carbon-zinc battery all the way yet. Is there a good technique for removing all of the contents?How can I tell the difference between the two black substances? Is the moist, black paste ammonium chloride? If this is so, then why, when I pull the graphite rod out of the battery, is it sometimes coated with a sticky, black substance? Do the substances mix with each other or are both substances sticky and black? Is one a powder?Is it okay to drill through one end of the battery? If I drill into the negative terminal of the battery, what will fall out?Basically, what are the physical properties of all the materials? How can I tell the difference between them?Now: On to alkaline batteries...Both types (carbon-zinc and alkaline) appear to use manganese dioxide. Is this so? On Wikipedia's article on alkaline batteries, manganese dioxide is described as Zn/MnO2, with the two as a sub-script. Does the slash mark mean that zinc and manganese dioxide are interchangeable?What will I find if I open up an alkaline battery? Is it safe to do so? What is a good, safe way to open one up?Are there any particular "fun" applications for these chemicals? Think explodiness ; )I've heard that manganese dioxide can be used to produce oxygen. How do I do this?There might be some yellow tag-box notes on these, pictures. For the context, visit my Instructable on how to make your own carbon arc light. I'm not trying to advertise, I'm just anticipating someone asking about them.

Topic by carbon 12 years ago  |  last reply 1 year ago


new type of search suggestion

Hi, it's me fidgety2. I am finally on summer break and have some free time on my hands. Considering I am a loyal devotee of instructables I want to get building except I have one problem. All of the instructables I want to do require things I do not have. For example, I do not have any cameras of the disposable nature. Or for conductive glue. I don't have graphite and being on a limited budget I can't go out and buy the necessasary items inorder to create these amazing instructables. So therefore I would like to suggest that a new search is created called the materials search. This search would be just like any other search on instructables only you could put in a material such as iron filings and all instructables using iron fillings would be the result. Now this would be as easy to integrate into the instructables website as the keyword(s) that the instructable makers type in. I believe that this will be a great asset to the instructables community. Thankyou, Fidgety2

Topic by fidgety2 10 years ago  |  last reply 10 years ago


how do i make lead dioxide electrodes? Answered

Hello, i want to try and make some lead dioxide electrodes, but i have no clue as to how. i need to make lead dioxide, then apparently mix it with a binding agent to make an electrode, and thats all the info i could find could someone please fill me in on the rest? like what that binding agent is and so on, what is the proccess involved in turning lead into lead dioxide? i have some old car batteries due to go to the dump as they are working at less that 50% efficiency which was apparently enough reason for my dad to say theyre ready for the dump! is it true that the lead sheets inside the batteries are just pure lead dioxide? the reason i need it is to make sodium chlorate, and in extension, potassium chlorate, and i dont want to use graphite electrodes as they will errode away, plus i cant afford any platinum electrodes, nor can i find them for that matter!

Question by oldmanbeefjerky 8 years ago  |  last reply 3 years ago


Chemicals people would want to make?

Basically I want to know what lab chemicals you want to make, if you know how to make any useful chemicals. please post, I am not responsible for and injury's, fatality's, or "bad things" of any sort that come from this thread, all things posted here are to assumed for informational purposes only.

Topic by mr.space 9 years ago  |  last reply 8 years ago


Makey Makey Build Night @ Boise State's Albertsons Library

On January 27th, 2015, students, staff, and faculty came together to discover how to use bananas as piano keys, graphite drawings as game controllers, and program in Scratch to use play dough as piano keys. This was part of the Library's new Discover by Doing workshops, and our first Instructables Build Night! It was also the first official event for the newly formed Creative Technologies Association student group. We had 20 curious and excited faculty, staff, and students come through that evening, and they all left with a smile...unless they lost at tetris. There were three stations, one to play tetris with a drawn game controller, one to play the "bianano", and a "free for all" table with a variety of supplies. Each table had a student facilitator and all the supplies needed to complete the project. It was inspiring to watch participants work over the course of the night, and to see them working together to solve problems. Including one student's discovery that if he licked his fingers, he achieved better conductivity with the bananas (don't ask). The Creative Technologies Association is currently working with faculty on writing Instructables for the piano that was created using Scratch, and the discovery and design of the "earthly" connection wristband. We can't wait to share them with you, and are looking forward to future build nights! 

Topic by BSUlibrarian 4 years ago  |  last reply 4 years ago


Iron Man

Hello. No one seems to have done anything in this group at all since inception. That honestly sucks, as I was hoping that someone would have put in some time and at least come out with some sketches, or put their thoughts down on paper. Well I am not one to complain without doing something about the problem. First up is the issue of powered movement. That is the core of Iron Man's super strength. You have 3 real options here. Hydraulic, Stepper Motor, or Servo Motor. I have filtered out hydraulic simply because it is not as easy to work with as the other electrical motors. I found a comparison chart, and a link to it is posted below. http://www.legacycncwoodworking.com/stepper-vs-servo-motors/ Based on the information it contained, I would say that a stepper motor is the most efficient way to go. It takes more power to run, and generates more heat, but neither of those problems is difficult to deal with. Heat syncs, and a propane/natural gas generator will solve both of those problems readily. The next problem is the exoskeleton, the armored body of Iron Man. I have looked into materials, and the difficulty in casting them, or machining them. ZA, or Zinc Aluminum alloys seem to be the way to go. They are relatively easy to make, requiring only about 900F to melt them, they cast extremely well, and they make extremely fine detailed castings. When they set up, they have hardness equivalent to that of Cast Iron. They also lend themselves readily to sand casting, mold casting, and to graphite casting. Alright, I have put my 2 cents in. Lets hear from the rest of you.

Topic by xarlock667 8 years ago  |  last reply 7 years ago


Help (advice) with building a Nautilus

I believe that nature in itself has the solution for all our problems . I believe that a combination of mechanical engineering and marine biology (marine comparative bio-mechanics) can provide a new scope of development . I have always been fascinated and intrigued by marine animals which have survived billions of years and great changes of the Earth . ( eg . nautilus)  [http://en.wikipedia.org/wiki/Nautilus ] . Its my understanding that this cephalopod has the most effective and energy conversant method of locomotion. It uses water jet propulsion for motion and uses the air cavities inside its shell for buoyancy  . These mechanisms of locomotion can be studied and modified for creation of low-speed , high-efficiency underwater locomotives . The Nautilus v.1 is a fusion of both biomechanics and state of the art electronics. It uses the habitual and operational features of the living fossil nautilus. The living nautilus is the sole inspiration reason for this underwater utility simply because of its magnificence. It has survived for millions of years in the open oceans which is a remarkable feat in itself but surprisingly it makes a daily trip of 150-200m from the ocean bottom to the surface nocturnally for feeding. Even though Nautilus v.1 uses many of the systems used by underwater rovs , it stands a class apart by achieving partial autonomy . The Nautilus v.1 is far superior from its rivals such as openrov, sea perch, etc. because of its low power consumption and longevity. It attains this by excluding power consuming components like propellers. Its operation is completely on the basis of neutral buoyancy attained by productions of gas bubbles by simple water electrolysis. The gas bubbles are collected in different gas chambers for operation at different water levels. The salinity of sea water facilitates water electrolysis and more gas can be produced with less currents. Graphite electrodes are used to prevent electrode corrosion. The electronics part is still under discussions for an optimum control unit. This will act as the base for addition of sensors and locomotive systems. Currently the main two platforms under work are the beaglebone black and the android versions. Both have their own advantages and disadvantages. Beaglebone would be optimum for component level additions, such as sensors can be added on, whereas in the case of an android system such as a smartphone, most of the sensors are inbuilt and their raw data can be attained. For progress till now, please visit http://opennautilus.wordpress.com/

Topic by cecilj 4 years ago


Im starting an ebay gadget store. what are some cool fun things to sell?

Well technically ive already started, but now, ive made enough profits to begin expanding. At the moment i sell 70mw green laser modules (not pointer pens), carbon graphite rods 5/7/10mm wide at any length and from time to time i try and get rid off my liquid a$$ stink spray, though people tend not to buy that as postage is $6, and lastly long range, but very cheap, 433mhz receiver transmitter pairs . All of this , from within australia, i plan on selling things which are awsome, as well as generally inaccessible by many australians. Currently i intent to buy up 6v spark gap ignitors , identical to those on sparkfun, different coloured laser modules, titanium to weld to my MMO anode mesht cuts, more wireless receiver/transmitter pairs, though, this time, toggle/momentary ones, currently my ones are latching, i plan on buying small shockers, and lastly, Nitrates, Aluminium powder, sulfur, and all those chems which are so hard to find in australia. Also, i will start buying more, and in larger amounts, thermochromic pigment. I also plan on building DC-DC HV converters, for charging coil gun capacitors, (based on the instructable of the same name, once i get permission to use the schematic to base my design off to sell), small shocker modules (to make taser things from), Various oscillators, like flyback ones, 3D printing services and 1W regulated 808nm burner modules. Now, ever since i discovered the spark gap ignitor wholesaler, ive been thinking, "what else could i sell thats awsome and hard to come by?", but legal too, this is ebay after all. I would really like some help in finding things which arent especially expensive or big (im not buying stuff which costs like $100 a peice), but also things you would like to see sold in your local gadget stores. Really, just anything in this general catagory, stuff which is really awsome or very hard to get, either in australia or anywhere, but not illegal. like novelty gadgets, or things which do amazing things, such as mini spy cam bugs or something. I really need help, i know what kind of things I LIKE, and want, but not what others like and want. please help me out!

Question by oldmanbeefjerky 6 years ago  |  last reply 4 years ago


The future of "mobile" energy...

Right now our current standard is still to use LI-Ion batteries when it comes to rechargable and power demanding devices.We all want more power for our phones, laptops or battery powered tools on the job.And we also want to be able to charge our batteries faster and faster.Back in the old days a D-Cell like lead acid battery in a flashlight was good for about 3 hours until it started to dim a bit.With up to 4 batteries inside they were not just heavy but also quite hazardous.Chargin was usually done over night and you just hoped they were not blowing up while charging.I spare you the other types that came after and that we still use as they all have their good and their bad sides.If we trust our marketing experts than quite soon we will only have electric cars on our roads and battery the size of a suitcase shall be able to run your car for hundreds of miles.The ideas of graphite based batteries or those using crystals and their forming reactions are all great and promising.Some will certainly make it to the consumer in a few years.The one thing that we are never told though is where all the energy to charge those batteries is supposed to come from.Replacing the combustion engine with electric motors is one thing but if no fossil fuel is used....Energy does not come out of thin air!Right now a lot of countries already struggle to provide a reliable power supply grid and distribution network.If you ever enjoyed a scorching hot day during a blackout caused by everyone using too much electricity you know what I mean...The population is growing as fast as the energy demand for our industries.Solar and wind are well and good but without proper storage solutions of not real use because no one can really predict how much they can produce.You know, weather and such things...If we trust our so called experts than all will come together really nice.By the time we have really powerful batteries we will have enough alternative energy supply chains up and running to keep them charged.I have a few issues with this entire concept, so let's see what other people have to about this:Imagine you have a nice and big cabin somewhere really remote and beautiful - but with no electricity for miles.Obvious solution for the modern hunter or nature lover is to invest into free energy.Free because that is how your solar, battery and inverter system would be advertised.You buy the stuff and after that all the electricity comes for free - the things pays for itself!Reality is a bit off though as you need to maintain and replace the costly batteries over time and such things.All this however totally changes for a residential home.Getting a huge solar system on your roof is no problem.Getting off the grid next to impossible.You see, once (or even before) you sign up for an electricity contract it is defined that your home is in a residential area.This brings certain limitations like the requirement to connect ot gas (if available), water, sewage and electricity.Only way to enjoy your "free" energy is by getting a good deal with your supplier.Some countries do it differently but around here it goes like this:Whatever you use still comes right off the grid.That is because your solar system really struggles to cope with load changes and providing surplus back to the grid.And since your meter is not capable ofworking properly with it either...To make it "fair" it is metered how much you use and how much you supply.Most companies here even do this on at least an hourly base - just to fair...For your bill the amounts are then adjusted.What you supplied is taken off.Sadly in most cases going negativ is not an option - if you provide more than what you use only your supplier is laughing.To make things worse what you supply is valued far lower than what you get from the grid.Often the difference is above 20%.Control....Around here quite a few people basically covered house, shed, carport and all with solar panels.This was while we had a great subsidy from the government to go solar...After now over three years most of these people still struggle to get anywhere near even for their investment.Without the grants the timeframe to break even was estimated to be around 12 years - which is about the time for when you need to replace the lot anyway and start over.Some do get nice savings on their bills though but families with kids not so much...If you have little to no chance to get your investment back before you have to replace it, then it is not really that much of a good deal after all.Imagine in town with hundreds of small houses everyone would be able to get the same money back for the electricity they provide...Pay 18 cents per kWh from the grid and get 18 cents perkWh for what you supply and once you provide more than you use you get money back.The providers won't allow this to happen as it means they not just loose some money but also they would lose control.How could they justify another price hike?How could they explain the blackouts?Why should tey pay you at all... ;)If a city with enough open and unused space would decide to go solar on a huge scale and while add also add a lot wind turbines....Someone would need the electricity provided and someone need to step in for those times where demand is above supply.Here the old triangle of power goes into full swing....You see a city or town would need also need a sub station to handle the electricity and to distribute it to the town houses, shops and so on.Funny thing is that only a "provider" can do such things.Doing it privat is usually only possible in really remote areas, like big mining outposts that just have no other option than using generators or solar/wind.And in most areas a town or city is no longer allowed to be a provider of electricty - at least not in the drirect form.Buying in bulk is no problem, having your own supply system however is not in the books.Right now most, if not all the big wind and solar farms are owned and operated by energy providers.There is billionaires everyhwere who could build a solar and wind farm the size of Texas if they really wanted but they won't do it either...Starts with the land, goes over the usage rights and won't end with activists claiming how bad it all is.Means it won't happen and if it does then the energy providers get together and claim they guy might have money but does not have the right to provide energy unless he actuall starts a corresponding company and plays by their unwritten rules.Can we still dream about it though?The dream is kept alive like the fire of hope that is only a tiny amber.If you sign up for electricity you are asked if you would like to pay bit extra so your electricity comes from alternative sources.Why is that bad, after all it is green?The initial investment might be huge for a wind farm but after that it is more or less just providing mone out of thin air.You can look the cost up for the new windfarm build near you.Same for the electricity prices in that area.And also the expected output of the entire farm.Do the math and calculate how quickly they break even....Once they do it only profit but you still pay the extra to go green.A bit like the new road that came with a toll....After 5 years the motorists paid it off but 10 years later they are still being charged while the road is disintegrating...Now add electric cars and our constantly rising consumption to the mix...We can't provide the electricity ourselfs as we don't get fully paid for it, we can go off grid either.The atom as the source of electricity is being phased out slowly as well.Finally as some might say, considering the thausands of years we have to deal with the produced waste and what aftereffects the storage might bring.Our providers will keep their grip on us for as long as they can.No government will stop them as in return they wouldn't have electricity.A cold war if you like.We never cared how much fuel our cars use until the OPEC decide to limit supplies and drive the prices up.And you can see the riches especially in Saudi Arabia.For most of the big OPEC players it really does not matter anymore whether or not they have oil or not.They make the same or even more money by other means and more modern means now.After this initial shellshock we woke up and decided that for the shopping trip of the wife a small car with just 4 cylinders will do.Overcrowded cities and roads also pushed us more into thinking small.Again it took force to go further, this time by governments slowy "going green".Emmissions, greenhouse gasses, polution, particles and corbon monoxide...Sounded all godd in the ads but it meant we could no longer afford our old car or even got banned from entering the town center with it.But a lot people still can't afford a modern car that meets the standards.Once they finally got the money and car the laws change again and they need yet again a newer car.This created a huge export and recyling market and profits for other people though.And what differenc did it all make in reality?While we were forced to improve and lose money countries like the US refused for years to even consider reducing the pollution.Countries like China and Russia even increased their pollution to impossible levels.We all remember how Bejing was literally shut down for the Olympics so the athletes have a chance to survive the games...We know how the pollution or global warming problem is misused to make money.The governments get huge payouts in the form of taxes from those cars that can't meet the specs.The dealer smiles with the increased sales of cars.And again the government smiles too as they get taxes from this as well.We know it happened before and is still happening with everything realted to fossil fuels, global warming and pollution, so why would electricity be any different?Reactors and coal fired power plants are phased out with basically nothing to replace them.Solar and wind will provide and till then we keep what we really need to keep....There is no plan for what comes after coal and the atom.There is no alternative.Batteries need electricity.And providers will always be the middleman controlling both the price and the availability.So how does this actually work you might wonder...No matter who invents or produces a new device to provide electricity - there is a very limited market for them.A farmer can't buy a full size wind generator and place it on his land...But an electricity provider can buy thausands of them....And if you go bigger than ask yourself who would need a 10 or 100MW fusion generator?Providing electricity is only a viable option if you go big and if you can sell the excess with a profit margin.Leaves only our electricity providers as customers.If you don't have to care about the buying price because it will be put down one way or the other onto your customers than it is like a credit.Only difference is that once it is paid off you start to get money back!Imagine that for your bank account ;)And if you know what you sell can have a very generous profit margin because your buyer does not care then the solar or wind farm will be quite costly to build..."We know we are not cheap, but who else can deliver you what you need?"And like our big supermarkets there will be an agreement on what the wind generator can cost.Ressources....Be it wind, be it solar or just the modern electric motor in your car - they all require stuff that is very limited on our planet.Take Neodyminum.Without it we have no wind generator or fancy motors as we wouldn't have powerful enough magnets.Vital elements and mineral required are only available in a few spots on our erth in quantities justifying mining them.I won't make this much longer than it already is, so please look up what is really needed to keep our future solow and wind projects alive.Then go and check where we can find thes things in good quantities.Once you did you might realise why the world tolerates the abuse of human rights, freedom or just self expression in other countries ;)If only China would stop today to export and sell their rare earths and prcious minerals basically our entire production worldwide would suffer quickly.Entire industries break down quickly and prices for certain things would literally explode.The US already started to re-open long abandoned mining projects as suddenly even the most costly operations become viable again.Think about this next time you fancy a world free of cars and truck using combustion engines ;)

Topic by Downunder35m 22 days ago  |  last reply 18 days ago