Small 2-stroke Turbocharger

I was wondering if any one had heard of attaching a small turbo charger to a lawn mower or weed whacker , if anyone has heard of it could you explain how, as i am anxious to try this with my recently salvaged 2 stroke and just see as much power i can suck from it.

Topic by firemanfu   |  last reply


creating a light that works on a blood pressure sensor/heat sensor

Hey I'm new here and have recently been thinking that I want to create a light that would work (i.e. turn on) when specific readings from the body are met. So far I have when a low and stable blood pressure reading is met (indicating happiness) or when a specific temperature reading is met (also can indicate happiness) I think I'm more inclined to want to build it with the blood pressure reading as the heat one could just turn on if you are hot. However I have HONESTLY no expeirience in building electronics but am really keen to learn! Could anyone point me in the right direction to where I should be looking please and what some of the steps I am going to need to take are please?  In my mind it would work when a blood pressure reading is taken and the monitor shows a reading within the healthy and happy range. However I literally have no clue how to tell a lamp to turn on when this is achieved  please please help me out!  thank you so much in advance Holly :^)

Topic by holly_westall 


how to get my printer up and running for 3D hubs?

Dear: Instructables Last summer I had fixed my 3D printer. Since then I have been printing stuff, a lot of stuff. So anyways now I want to get a job for 3D hubs with my printer and my family says that I should probably get my printer printing more reliably and honestly I have to agree with them. I saw for the 3D printing class there were four classes on this site. I feel like I might do better taking the last class since I already know so much. I can print stuff the question is if it is of decent quality. Do you think it is a good idea to take the last 3D printing class or should I take all of them if it can get me ready for 3D hubs? Thanks!!! From: Noah

Topic by nschreiber0813   |  last reply


Rock substrate to place in experimental flume

I plan on making an insert that goes into an experimental flume.  The frame of the insert will be about 3" x 24" and will be constructed of acrylic.  Onto the surface of the insert i will affix a rough bed of stone/rock.  Stones will be ~ half-inch diameter.  Does anyone have guidance as to what type of material (epoxy?) I should use for the base of the flume into which the rocks will be placed?

Topic by Jeff MacDonald   |  last reply


create "black body" and measure radiation

Hi i have been looking for some experiment about black body radiation how can i make a black body at home and how can i measure the black body radiation using inexpensive materials... i would like to measure plank's constant and so... i didn't find anything on the net any suggestions? thank you!

Topic by yitzik25   |  last reply


How to make a mold

Hi there! :) In a couple of weeks I'll receive my first 3D printing! I'm so excited about it! One of my first projects I would print is a Flower Pot and... I'd also like to print a mold of this Flower Pot but I have a question: > First check the image of the Flower Pot dsign< How should be the design of the mold to allow me to make a new models with concrete (cement). I don't know how to solve the holes. Look, if I do with two external parts and one internal part... how can I do the holes and after take out the mold? I will think more about it but, if you have any idea... it's going to be great read it!! Thanks a lot!! =)

Topic by Kitus87   |  last reply


What kind of power supply for this LED array?

Hi, My grow light failed on me recently. It's a series circuit of perhaps 3W diodes.  LED array pic: http://i.imgur.com/YQfJSrZ.jpg There are 18 diodes, and the colors are:  10 x 660nm (red), 3 x 630nm (red), 1 x 610nm (orange), 1 x 520nm (green), 1 x 430nm(blue), 2 x 450nm (blue), Total: 18 pieces Driver: http://i.imgur.com/Fpt2x4q.jpg I'm not really that knowledgeable about electronics, so what specs should I look for when buying a replacement driver? Is it as simple as getting something that is 8-12W like in the image, or is there more to it than that? Thanks.     

Topic by horsebones   |  last reply


3D Printing Pen ABS plastic

Hi there, So I've seen a lot of stuff online about 3D printing releasing what are potentially toxic fumes, and I'm wondering how this transfers over to 3D pens?  We are looking to use them for workshops for kids, and there have been some concerns about it, so I'm just looking to see if anyone can point me in the direction of some info? All I can find is about 3D printing, and I can't imagine that using a 3D pen for half an hour on and off is the same as printing a whole object fume wise? Thanks!

Topic by sb9   |  last reply


Thoughts for a fan for venting a homemade 3D printer enclosure?

Hello all, I'm in the early stages of building my own enclosure for my 3D printer. I'm going the route of building it using Ikea Lack tables. I'd very much like to put in a fan to vent the fumes from printing out the window via a hose. Originally, I was going to use a USB fan, but I'm starting to wonder if that will move enough air to make any difference. I was going to go with USB because I have no electrical work skills. I'm curious if any of you have thoughts, or have already come up with solutions for this. I'd be interested to hear any suggestions or advice anyone has. Thanks!

Topic by JesterPoet   |  last reply


Need Help on Orrery gears

Hi, I'm planning on building an orrery and I need some help. I've been doing some research on instructions on how to build one. The main thing that I'm not completely understood with is the gears and how they actually work. I know a bit about some basic principles of gear ratios and stuff but not like the actual mechanism (ps i like to look at diagrams). I'm also planning on making 9 planets (i mean 8 + pluto and the moon and the sun). Any help would be appreciated, thanks!

Topic by xelasetahevets   |  last reply


Old CD/DVD Drives with 2 wire DC Motors for DIY CNC

With a lot of old electronics lying around, I embarked on taking them apart  with the intention to use the sled motors to build my first CNC. Unfortunately, I found only 2 wire DC Motors with limit switches on the laser sleds.  Here is a list: 1.Sansui DVD with Sony Laser Carriage- 2 wire sled motor with Limit switch 2.DVD player from 32cm Bahun TV        -2 wire motor with limit switch 3.CD Drive from Dell Laptop                    -Miniature motor with LS & 2 track ribbon connectors. 4.Mitsumi 31/2" Diskette drive                 -Stepper with less travel The only 4 wire stepper motor was on the diskette drive. Is it possible to use the 2 wire DC motors in my project? What sort of logic control will be required. How did they function in the DC/DVD drives?

Topic by Dolon12 


i need more amps for my hho generator.......HELPPPPPPP

I've built a hho generator (the spiral electrodes kind) and am trying to use it as a welder i use salt as my electrolyte (should i use something else???) THE PROBLEM IS THAT WHILE I DO GET A CONSTANT FLAME, I DON'T GET A BIG ENOUGH FLAME (it melts metal but it takes ages to do so) does anyone know of a way how i could get more amps to speed up gas production or of any way i could get more preasure (+maybe my gas isn't pure enough because i use salt as an electrolyte, could that be it?)

Topic by CrtSuznik   |  last reply


Advice needed to fix a jammed seatbelt

Hello to anyone reading this, I have a jammed seat belt in a 1998 Ford Taurus, and I was looking for some help with fixing it. I've seen videos on youtube that offers an all-in-one fix for jammed seat belts for various car models (including ford), but I'd like get some opinions here before I consider using the video's steps. I've included a picture of the jammed seat belt. Any help would be most appreciated. Thanks in advance.

Topic by SR91   |  last reply


Fusion 360 on Apple MacBook

Hello - I've recently been having troubles running Fusion 360 on my Windows 10.1 laptop. I've seen that most people use Apple MacBooks with Fusion 360 CAD software, and it runs quite fast and reliably too! So, I was wondering which MacBook would be the bet for this application? I am thinking about getting the new MacBook. Let me know what you think, and past experiences you have had.  http://www.apple.com/macbook/ Thank, Dylan

Topic by DylanD581   |  last reply


Cathode Ray Tube and Cloud Chamber Combined - Possible?

Is it possible to build a cathode ray tube and observe the path of electrons in a combined (or linked) cloud chamber? I would want to apply a uniform magnetic field to the cloud chamber but not the CRT so that electrons travel in a straight line into the chamber and are subsequently deflected. Oh, and ideally using materials that were available in 1917! Thanks in advance.

Topic by boroman   |  last reply


arduino

I would like to meet how integrated the fuctions interrupts in the encoder for increase the count in the car What am I doing. help!

Topic by gabon   |  last reply


Best Type and Source for Omni Directional Wheels?

I am currently in the process of compiling a shopping list for an omni directional robot a team and myself are planning to put together. For this, wheels that go both forward/backward and left/right are needed. From what I have found, there are two variations: Omni and Mecanum wheels. Due to our design, we will be needing Omni style wheels.  However, doing some research, I haven't been able to find much of a selection! So far, robotshop is the only website that actively stocks them, and they sell two brands/types, one being VEX.  Is there a generic name for these types of wheels? Where would I be able to find more/a different source for them? Why are they so expensive? If you've used an omni wheel, what type/brand was it, and what was your opinion on it? The big problem is, is that we need to mount the wheels onto 5mm stepper motor axles. Half of the wheels I found on robotshop had square bores, and the other half used an interchangeable hub, none supporting a 5mm axle. Any ideas as of what to do here? We would like to get four wheels, preferably for less than 50$.

Topic by RocketPenguin   |  last reply


Know how to make Butanol/BioButanol?

I've been recently reading up on Bio diesel and I've found that butanol is great for cars that run on gasoline/unleaded petrol.Does anyone know where there is any reliable information on how to make bio-butanol, Maybe out of algae?Wiki Biobutanol reference

Topic by thermoelectric   |  last reply


Magnetic actuators - anyone here ever made one?

Magnetostrictive alloys like Galfenol are not only quite cheap but also quite possible to produce and machine at home. As it seems that right now I can't finnish anything without being stopped by something else that got my attention I am a bit stuch on all ends now LOL Anyway, I still have a few kg of rare elements like Gallium, Bismuth, Antimony and such that I misused for my testing of home made ferrites. So apart from making some fancy metals that melt at very low temperatures I thought a much better test usage would be to make something that for once has some real world use :) If you look up some of the research papers for Galfenol use or magnetostrictive materials in general you soon learn two things: a) You need a degree or have studied something related to fully understand the technical stuff behind it. b) Finding something that would give you enough info to make something that works as planned is next to impossible. I don't mind wasting some time on melting steel, machining some samples and do some testing but of course this takes a lot of time... So I was wondering if anyone here already experimented with magnetostrictive materials and their possible uses? Apart from micro actuators for minature things I don't have I was thinking of generator use. A lot of things produce wanted and unwanted vibrations, magnetostrictive alloys are capable of transforming them into electrical energy by simply using a coil around the material. For example the recoil of your favourite hunting rifle could in theory charge your dot sight or laser sight/flashlight. Or the otherwise useless vibrations of big machines or rock tumblers can be turned into something to charge your phone. Not to mention impact sensors or flat surface loudspeakers....

Topic by Downunder35m 


IGBT ZVS Induction Heater?

Among the many tutorials for building an induction heater out on the internet, there are two primary types. Some heaters use a ZVS circuit, and are quite simple but generally limited to a power of around 1000 watts, not enough to melt most metals. Other heaters use PLL controllers and coupling transformers to add charge the primary coil/capacitor loop, and these can be much more powerful but are significantly more complicated (and expensive) to build. It seems the limiting factor in the power of the ZVS circuits is that they can use only 2 MOSFETs, and each must conduct large amounts of current. However, if these could be replaced with IGBTs, which could conduct far more current, a much more powerful ZVS induction heater could be built. Is there any reason IGBTs couldn't be used for a ZVS heating circuit?

Topic by PleaseWork55 


Safety Shutoff Bumper on Electric Wheelchair

Friend has Parkinsons.  I'm setting him up with electric wheelchair. Best if he doesnt run it through walls, or run over anyone. need electric shutoff on bumper front and back. How, exactly? and. Go.

Topic by Toga_Dan   |  last reply


converting a bike to a trike?

Anyone have info on converting a bike to a trike? My disabled son has balance issues but wants to ride with the family, however we can't afford a new adult tricycle or one of the expensive conversion kits. He's much too large for training wheels to work. I'm hoping to find a way to convert an old bike with minimal expense and no welding.

Topic by valr   |  last reply


Fusion 360 instructor wanted

Does anyone know where  I could find hands on instruction here in the San Francisco Bay Area?  I have tried posting in local media for a part time instructor but have had no luck. Thanks Wayne

Topic by WayneD59   |  last reply


IC connection with Arduino .

How to connect IC L298n with Arduino ??

Topic by manjusulagna154   |  last reply


GoPro Scuba Cylinder Mount

Hi there, I'm new here. I've recently found an entry-level 3D online modelling software, Tinkercad and have been Tinkering ever since. I'm into scuba diving and I've long wanted to design a GoPro mount for the cylinder to give a 3rd person view of me while I'm swimming about enjoying life underwater. (Think a less-sexy Lara Croft!) I wanted to run it past you guys to see what you think. I've attached 2 screenshots, because as you can see, the mount I've designed is collapsible, to save space in my GoPro bag. I've done the maths (Pythag) so each side is perfectly lengthed to create a right-angled triangle, with the hypotaneuse (long edge) is facing down my body, towards my feet, so that the camera view won't be obstructed. I've used a Pythag triple, so the arms measure 3", 4", 5". This was done for 2 reasons: a) It was easier to desine using these measurements and b) I don't want it sticking too far up from my cylinder so that it doesn't catch on wildlife/coral/divers. As this is my first GoPro mount that I've designed, I've had to go on deimensions I've found online for the actual hinges. I've settled on approx 3mm for each prong as well as the gap in between. I have actually shaved off .25mm from the middle prong of the 3-pronged-hinge, and left the 2-pronged-hinge at 3mm for the gap and prongs. I'm going to get the pieces 3D-printed by a local service I've found on 3DHubs.com, either in ABS plastic or in resin, though I'll probably go for ABS as it seems to be a bit more hard-wearing, even if it's not so detailed. In terms of mounting it to the tank, I will use 2 headstraps, with the over-the-top strap removed from each one and glue the plastic bits of each of them together, at the correct length of course. I would join them using a seperate piece of plastic and either a hot glue gun, superglue or even some sort of epoxy, whatever lasts longest in prolonged exposure to seawater. I would probably place it nearer the top of the tank, near to where the strap of the BCD jacket goes round it. Does anybody have any advice for me in terms of the design from a functional point of view as well as from whether they think it would actually get a good shot on the camera please? I look forward to your feedback, good or bad!

Topic by JackIsted   |  last reply


Bicycle & Folding Shopping Cart

I've been trying to find some DIY instructions on how to attach a folding shopping cart to a bicyle, but get no where. I once saw someone on a bike who did just that, but I didn't get a close look at it. Nor did I ask them how they did it. Both of us were on errands, so.... Anyone out there who can figure out how to do this, without welding & metal bar cutting, as I don't have such tools to do that. However, if a hacksaw will work for any cutting needed... Thanks

Topic by MelPhleg   |  last reply


Advice on how to go from 3D model to laser cutting vector file?

Hello,   I've been getting my feet wet in 3D modeling to try to build board game inserts. These are generally a series of boxes and trays that fit together to hold components and fill the space of the box properly. I have access to a 3D printer, but I can't figure out how to go from my model (in tinkercad or sketchup, generally) to the 2D vector files of the components I need for Corel to print them on the laser cutter. I suspect the process is more than someone could explain to me in the confines of this forum, but if someone in the know could give me a push in the right direction to find the resources I need, even that would be great! I've done a lot of research trying to figure this out, and all I have come up with are some Sketchup plugins that no longer seem to work, or websites that will lonely let me build one box at a time with no extra features (like scallops for card draws). Thanks in advance for any help anyone can offer. Todd

Topic by JesterPoet   |  last reply


Power genration by Foot steps

The main purpose of this Project is that to design a system that convert the mechanical energy harvested from human motion into electrical energy.This project report contains the complete literature review and implementation of an alternative to electrical power supplied by batteries for portable electronic devices and for computerized and motorized prosthetics. The report presents the idea to generate power harvesting from human motion. Electrical devices have been liberated from the wall socket. Battery powered computers, phones and music devices come along everywhere we go. The limiting factor is electricity. In the end the battery always goes dead. Ironically, when we move around with our portable devices we produce a lot of energy. But a lot of this energy is lost as heat. If that mechanical energy could be converted into electricity, our very mobility could charge our mobile devices. Using the working principal of dynamo, we intend to generate a small power which then can be used to charge the portable devices. We are charging mobile battery for testing purpose.

Topic by engr.zainshah   |  last reply


Can someone help me with common cathode leds and push buttons?

Hello everyone! Im planning on doing a thingy like this for my son, can it work? Im going to use a 3V 1A power source to connect 3 push buttons to a common cathode led, like on the image included. I was planning to use this led: http://www.ebay.com/itm/2p-10mm-RGB-LED-Common-Cathode-4-Pin-Tri-Color-Red-Green-Blue-3v-6v-9v-12v-FCL4P-/290802586540?hash=item43b52f53ac:m:m6IDFR2pATn4PfCbuH-kqzw and switches like this: http://www.ebay.com/itm/152146897080?_trksid=p2055119.m1438.l2649&ssPageName;=STRK%3AMEBIDX%3AIT is says: Light Voltage DC 3V In my mind it looks like this: if u push the red, the led will turn red, and u can add additional colors to it with the other 2 buttons. Could this work? If I figured it out good, I wont need a resistor for the blue and green, but I will need one for the red. How big it should be? Is it a good setup that I solder the positive to the switches and the black/negative to the one led? Can I add an another lead from the power supply to an another independent switch and single color led?

Topic by Smitiz   |  last reply


Is there a software where i can download and make my own 3d printer items?

Is there any software where i can make my own custom 3d printer items to download and make through mine?

Topic by Carbonado   |  last reply


Leyden Jar

Any suggestion on how to charge a Leyden Jar?

Topic by YoloPeeps   |  last reply


Learn Spanish & English

Happy new year!!! 2017 This group was created for estabishing a Knowing of the other countries students, young people, and meet people from universities. Please note: (This group is for to mmet people not for loving or sexting).

Topic by erik_montesdeoca   |  last reply


Turbine generator with heat pump

I got another weird idea that I like to share as I don't see me putting into reality anytime soon but someone else might do it for me after reading it ;) If you like me and call home where it is far too hot for most of the year you might have wondered how to cut the energy bills down. Especially if you in a remote area "off the grid". Sounds interesting? Then just do me the favour of posting here if you plan to put into reality and keep us updated ;) Technology has come long way and with some mirror like Mylar foil anyone can build big reflectors to use the sun for heating all sorts of things. Modern solar hot water systems are designed to produce a temp high enough to kill all harmfull stuff that might otherwise grow in our system but we can one step further: (Keep in mind it is just an idea with no prototype to proofe the concept works as expected!) Using heat pipes in a round reflector that is linked to solar tracker would allow us to boil water for as long as the sun is out there. Don't know if the flat types used for hot water systems are capable of producing steam but someone might have an old one at hand and is willing to test it on a sunny day? Anyway, assuming we can build a large enough array of solar ovens heating water pipes it is possible to drive a turbine with the steam. A linked generator of suitable size would now provide the electricity we might need to charge batteries or to power other things. But of course this would be total waste of the remaining energy in the steam! Plus we could really need some airconditioner, don't we? So in my vision we don't want to waste the water either, which mean we not only use the heat but also reuse the water to go back into the solar oven. If we now use an uscaled version of our RV fridge and instead of a heating element or a flame our remaining heat from the steam we can power a big fridge and an airconditioner on the same continous-cycle-ammonia-fridge type to cool what we need. Depending on the size and insulation rating of a house it is possible to be totally independent from the power grid during the sunny times. During the winter times the same generator can be combined with a ducted heating system where the waste heat of it is used to produce the steam we need. Of course integrating this into one unit would be the prefered option to keep the physical dimensions small. Combine all this with some good sized battery backup and inverter system and you might have enough juice to spare to make it through a cloudy day or two. Add some wind generators if you are in a suitable area to provide additional electricty. I think with new parts and some handy work it should be possible to create such a system for under $3000US. With access to some well sorted scrap yards even for free, not counting consumables, selants and so on... Sadly I don't own a house and currently not even have a garage to set up a little workshop so for now it stays an idea only... Tried to find some sponsors or at least people with interest to create something like this down here but it is like trying to explain quantum physics to a hundred year old in the retirement village. Sure, you can build something that would give me electricity and cooling for free? ... Of course it will work, so come back and show me once you made it.... If that crap could work, why are still buying fridges that run on electricty and airconditioners that drain our bank accounts?... We have 5 cooling containers outside runningon generators that use over 200liters of fuel every day and come try to tell me a steam generator can cut me fuel bills down by at least 50% if not more?... Just some of the more friendlier responses I got after trying to find some interest. Don't know if it is problem of the Aussie mentality or if I am just unable to make someone understand that we can use the scorching sun for free :( But I am not willing to give up on the idea itself, so what do you think? Oh! You have the financial means and access to create some prototype to integrate into a new cool house or  self sustaining home? Please feel free to contact me so we can start and make a living out of it ;)

Topic by Downunder35m   |  last reply


Swapping out a lead acid electric bike battery for a Lithium Ion one.

Hi folks. I have a fairly old but still quite serviceable Thompson Euro Classic electric bike that runs on a 36v lead acid electric battery pack with a brushless motor. I've just been offered a 36v lithium ion bike battery that I would love to use but I'm not too sure if it would be the right choice, my main reason for the change is simply weight consideration, the current battery pack comprises of three 12v batteries and weighs in at a hefty 28lb the replacement weighs a little under 4lb, this would very obviously make quite a difference in the bikes 87lb overall weight. However weight isn't the only consideration, I would like to extend the range of my bike and with a little work and some suitable wiring and a couple of switches I could quite easily use the battery as a second power source for longer rides, I fitted a large plastic  tool box onto a rear carrier when I first bought the bike which would easily accommodate the battery or I could possibly even add an external carrier for it behind the seat, the current battery is good for around fifteen to twenty miles depending on how many hills I hit & how much I feel like pedalling, I hoping that an additional battery would double the range meaning I could rely on it to visit nearby towns without having to worry about finding somewhere I can give the battery a booster charge. My main worry is about damage to the motor, I know very little about electric bike motors and having read so many stories about these batteries suffering from overheating problems and even catching fire I am more than a little concerned I could damage to my only transport, I usually ride motorcycles but thanks to a couple of health issues I'm currently grounded so apart from walking which can be pretty limiting this bike is my only way to get around without spending a fortune on public transport I'm looking for advice from people who know about electric bikes and their motors who could give me some simple advice in layman's terms on how to proceed, please don't blind me with all sorts of technical jargon as it really wouldn't help, I'm not stupid it just isn't my field of expertise. Thanks in advance for your help. NG.

Topic by Nostalgic Guy   |  last reply


Arduino

I am new in the programming stuff and i have, un familiar error problem. I hope you guys cold help me. thank for all the answers!!

Topic by ברקו   |  last reply


Help Please! Rube Goldberg Project Rutt

Hi Everyone I have a problem! I am trying to find a way to make a Rube Goldberg project where I have fake lego man with magnets on his hands and feet with acrobat bars that "swing" back and forth and the man is suppose to clip to the next bar of increasing strength of the magnetism till he gets to the end of platform on the other side. I problem right now is I am trying to find a set of magnets in increasing/decreasing strength to finish the project but I have no idea where to find them. If any one has any ideas I could really use some right now! I have concept drawings! You would have my undying gratitude. Thank you!

Topic by seerofsorrow.   |  last reply


Xaxxon Oculus Prime

I have bought and built a Xaxxon.com OculusPrime, While the unit is sound i have had problems with LIPO batteries charging wrong even though it has a balance feature , I have also had calibration and program (python) issues where it will work for a day or two then out of nowhere it stops working Does anyone know or have one of these units that could send some much needed help?

Topic by cybersarg 


Parrallel Load to a Charging Battery???

This is not an instructable but a question. See the images for circuit here the 9v battery represents a 12 DC V from an Adapter and the Capacitor represents the Chargeable Battery. Diodes are placed before Chargeable Battery and LED in the direction of current to prevent current in opposite direction. Suppose I have a Chargable Battery of 9v, A 12 Volt adapter (12 volt to charge 9v battery), and a segment LED Strip (3 LEDs in Series.) Now I connect discharged 9V Battery to LED, and adding the 12V DC Input in Parallel as well. I want 12V DC source to charge Battery and Light up LED. I will add protection Diodes as well in positive terminal of led and battery so the current wont flow from the battery. Will the LED light up at 12V at its full intensity? I found somewhere that while a battery is charging, adding something in parallel will draw less current at first and then the Amperage will increase with increase in battery level and then after a lot of time, it will draw as much as current as it would in 12V directly? Is it so, how can I avoid it, i.e, I need the Load (here LED) to get 12 V while that same 12V source should charge the Battery. Sorry for any grammatical mistakes because I am in a hurry. Please answer me. Thanks.

Topic by The Engineer Pro - Mohammed Ayaz Quadri   |  last reply


Elmers Glue + Super glue =?????

I was making some stamp glue where i mixed some Elmer glue and vinegar. but wanted to see Wat happens when i mix Elmer's glue, vinegar, and super glue. like in 10 seconds the solution turned into a rubbery solid which took the form of the container. can any body tell me why this happened. it held its shape and slightly reminded me of molding silicone. it wasn't sticky and came out of the plastic cup easily.

Topic by chrischavez   |  last reply


3D Printer XYZ Axis Problem

So, I finished building my 3D printer. I installed the firmware, etc. Whenever I try to print in repetier the X and Y axis move really fast while the Z axis doesn't go up nor down. I have tried so much to fix but I just can't find a solution. Also, I have the MK9 Extruder and for some reason the extruder doesn't feed the filament, it just stays there. In case you ask, I have not be able to print anything. There is a video of the process, and sorry for the mess.

Topic by JoeM286   |  last reply


Which low boiling fluid to use (that won't corrode metals and plastics)?

I'm having a bit of a headache trying to chose and procure a working fluid to use in my solar device. It needs to be low boiling, but as my device so far is involving copper, aluminium and maybe some plastics and rubbers, it would also need to be as non corrosive as poss. Cheap and plentiful are also important, not so much for the prototype, but when these things are ultimately used, they need to be easy to assemble. The four options I'm aware of so far are: Methanol boils at 64.7 °C, I thought it would be easy to get but is turning out quite difficult and maybe expensive, also apparently eats through every material I plan to use. Ethanol Boiling Point: 78.4 °C, easier to get but still corrosive. Hexane Boiling Point: 69 °C, not corrosive (?) but not at all easy to get or cheap. Water Boiling Point: 100 °C, which may be a bit too high. The fluids will be boiling in a non-pressurised but sealed environment, so no atmospheric water will be able to get in or out. Help?

Topic by SolarFlower_org   |  last reply


can someone explain me why some crystals have different shape ?

I'm a french student (15 years old )and for my final exam of this year I have to make a presentation about the crystalisation. So I'm asking for help to know why some crytals have diferents shapes ?

Topic by julien-fr   |  last reply


NST in tesla coil

Hey,I was thinking of making a Tesla coil for my science fair.The fact that NST (neon sign transformer) are a bit expensive, could anyone suggest me another way for its power supply other than using it

Topic by Энтони   |  last reply


Car Air conditioning without Engine Running

Thinkin of running the AC from batteries at times I don't have the engine running. So- electric motor rather than direct drive from engine? How long will battery last? maybe need to have a second battery for this?

Topic by Toga_Dan   |  last reply


HHO powered car

One of my friends asked for my help for a project for his school expo. He wants to run a car on water and I have told him not to be too optimistic. when I googled it all I found was that it was not possible(as of now), but no other detail. I did stumble upon an old episode of myth busters in which they came to the conclusion that a car can run on hydrogen, but they were unable to provide enough hydrogen from their electrolysis setup, however, I noticed that the HHO generator created by king of random produces way more gas then theirs. so I wanted to know your opinion and knowledge on this matter and whether this can work or not.  

Topic by Ahtasham Ahmad Mohtashim   |  last reply


Would you guys like an instructable for this gas powered bicycle?

I was wondering, who would like to see a detailed instructable with step by step instructions, lots of pictures, and parts lists for how to make this powerful motorized bicycle from scratch (without a kit)? The motor is a heavily modified 79cc horizontal stroke predator engine from harbor freight. The bike has a top sustainable speed of about 40mph. It also has enough torque to accelerate uphill, take off from a standing start with no pedal assist, leave Lance Armstrong in the dust, and do wheelies even with my 29" tires. Gearing can be adjusted for higher top speed at the expense of having less acceleration and hill climbing power. (Although in all honesty, I wouldn't gear it to go much more than about 45). Other features include an automatic clutch, the ability to get 170 miles per gallon, allowing you be cooler than all your friends, and costing a fraction of what you'd pay for a vespa. If you want me to make an instructable, comment below! Also tell me whether you might actually build one, or whether you just want to see how I did it.

Topic by TheNecromancer13   |  last reply


Isolate Boron?? Boron Carbide T-Shirt?

How would I isolate elemental boron??  Can I remove it from borax?  Also can anyone tell me the ratio of boron to water to make a boron carbide tshirt.

Topic by Moonman0922   |  last reply


Transformer not behaving...

I hope someone here can help.  I have a AC to AC step down Unrectified transformer, i.e., no circuit board whatsoever.  Primary winding has continuity, secondary wire has continuity.  No continuity between primary and secondary wires in any way.  In short, power goes in, but no voltage comes out.  If someone that knows precisely how transformers work can explain to me how a magnetic field can be generated but no electricity generated on the 2ndary wire I would appreciate it.

Topic by PeterE56   |  last reply


Finfing This 3D printer for Students

Hello I received this subject and instructable for a cheap printer 3D, but now this page its not here. Somebody may help me in this search. Thank you so much. $60 Hi-Res DLP 3D Printer This was constructed with an old pc  Regards

Topic by Janethbee   |  last reply


Bluetooth speaker with Usb port

Hi, I need some help here..iI have a small 2.1 bluetooth amplifier and I would like to add on it a usb port inorder to plug my usb mp3...is it possible?

Topic by VassilisT   |  last reply