Post links to large K'NEX gun targets here! Please post the link with an optional comment!
Topic by NatNoBrains | last reply
I need to make a LARGE metronome. I am teaching a beginner band, and the small metronome I have now cannot be seen or heard when everyone is playing.. Something like this would be great: http://www.youtube.com/watch?v=O219Pm9Sl5Y but I need it to be HUGE, like 5 feet across.. Similar to a beta brite LED sign array.. ALSO: I want to be able to control the BPM, not just a dial that increases speed and slows it down, I need to be able to put in "80bpm" or "90bpm" etc.. Could I use the above
Topic by 3DPiper | last reply
I just made a gun with a 10 bullet magazine that shoot's 72.1784778 feet!!!!!!!!!!!!! with four rubberbands!!!!!! I think it can hold more but I haven't tried yet. What I wanted to know is how to make a good measurement system for proving range, I would appreciate if someone could tell me. (Also I told people my oodammo sniper shot 90 feet, this was a mistake, I thought a meter was 4.5 feet). I will soon post a video proving the (unangled) range. Edit: I will not post the video since there is so little interest
Topic by Mr. Muggle | last reply
I'm looking for a relatively cheap motor that would be large enough to spin around a nerf Vulcan. I don't know much about what kinds of motors would be good, or where I could get them. From what I've found, they're not that common and they're super expensive. Does anyone know where I could get one for under 100 dollars? It doesn't need to be fast. Thank you in advance for your help.
Topic by alecnotalex | last reply
I am thinking about getting into large format photography & I was hoping that I could get some questions answered by other photgraphers on here. 1: How many of us out here use large format cameras? 2: What is the type of technique that causes the pictures to appear w/ a yellow or brown appearance to it that is used in vintage photo sessions? 3: Can I get some tips on developing w/ an enlarger it has been about 10 years since I've used one so I don't remember anything about that. Any help w/ this would be greatly appreciated, thank you ahead of time.
Topic by sofiadragon1979 | last reply
I am looking for some advice on polishing large stones. I am from New Jersey, and there is a plentiful supply of bog iron. I can't dig a hole in the ground in my yard deeper than 8 inches without coming across some of it. Some stones are small but most wiegh about 20 to 30 lbs. I have several that are at least 150 lbs. I have tried to use them in as many ways as I can think of to decorate my yard. But bog iron is not always an attractive stone. I have seen some small polished samples on the internet and I like the way they turned out. I would like to try and polish some of my larger stones. I could do it by hand but it might take months or even years. I'm not sure what a sandblaster would do to it, but I don't own one and am not looking to buy one. Does anyone have any ideas or suggestions for a faster way to polish a large stone. Thanks in advance.
Topic by feign | last reply
I was wandering the web, looking for information for a future Instructable, when I got ever-so-slightly side-tracked.I came across this blog entry about a bunch of people who made their own, rather unique, sundial:Our friends in the village are building a garden from scratch, to go with their new house. A key part of garden planning is to get the major design "features" sorted out ahead of the planting. One of the things that the boys wanted was a sundial, so work has started there. The plan follows the traditional method of sundial construction, as you will see from the pictures:1. Buy a World War II anti-aircraft gun (preferable the portable kind)2. Put it in the garden.3. Make sure the safety catch is on.4. Invite some like-minded nutters round for a barbecue and get them working the elevation controls.5. Set the barrel to exactly 52 and a bit degrees elevation (to match the latitude of the garden).6. Do some nifty work with a calculator and a compass to figure out where the hour markers go for precise "Northmoor Time".7. Unilaterally declare independence - and if anyone argues....:lol:Link to Blog
Topic by Kiteman | last reply
Could someone tell me how to ground a large electrical circut.I have a die-cast aluminum box, on which there is a strip wire connector which connects all the tiny goundings on the circuit and finally to one terminal.Now, what wire to use for grounding, about 18 gauge or so?I have no idea ,but is is better if the wire is NOT flexi-type.I want it to bend(and stay so) into different angular bends(not a curve)Also i need to put a copper tube on the end of the GND wire, how to attach it to the wire,by screws?? I put pic of non-flexi wire in the post too
Question by mhkabir | last reply
I am working on a project and have a large tank full of product kind of a greasy substance trying to heat up to temp of 180 degrees. the tank currently has a 4 inch pipe running inside wall all around tank for heat transference.. At this location a boiler is not a option at this time . I was curious if anyone ha s ever attempted a large induction heater build one that would encase a 4 inch pipe and heat liquid inside so thermal transfer would heat our product. Sorry for not including all details at this time i just curious if large induction heat was possible or efficient ?Thanks,
Question by andy1917
Hello,Is it just me, or there's something wrong with "Large motors" and "Electronics class" by randofo? It looks like there's nothing in comparison to just yesterdady, whereas I bought a premium account just to download his classes. Another problem is that I can not enroll or download any classes.Can You help me?
Topic by Emerid | last reply
I'm wanting to build a large shipping scale with capabilities of measuring up to 2400 lb's. I'm curious if anyone has done anything like this and could give me advice. I was thinking of combining 6-400 lb. scales with an arduino and simply displaying the sum of their weights on an LCD screen. Do you think this would work?
Question by Spaceman Spiff | last reply
I am not particularly gifted at the finer points of building things and would love your thoughts: Have you made, seen, or have ideas for a very simple automated, rotating DIY roaster that could be used to roast a large amount of nuts? Or on a simpler scale, Ideas for adding a motor to one of those whirley pop popcorn stovetop jobbies to get the handle turning automatically? Thanks all!
Question by susie | last reply
I have a large exercise ball that has a 2" gash in it compliments of the cat. i'm a nice shade of green and re-purpose/reuse everything i can. I have thought of a planter,a tiny 'pool' in the garden for critters and a beach bag. I would love to get a few mre ideas to what i can do with it.....anything but throw it away. it never really goes away anyway. Bring on the suggestions! :)
Question by diymentality | last reply
As a participant in AngryRedHead's Photo challenge, I've noticed that, as the thread gets longer, navigating it to find my past comments and replies is getting... odd. Using the next and previous buttons seems mixed up. Sometimes you don't get a new set of comments, sometimes you get a few extra comments in between the ones you already saw, sometimes nothing happens. Similar things happen on other topics with large numbers of responses. (Running XP and up-to-date FireFox)
Topic by Kiteman | last reply
I've noticed that a lot of my pictures in my instructables appear fuzzy, blurry, or just plain compressed. I suppose that's because they are. I like to upload large images (720x1280, for example), but it would seem that when they get shrunken down to fit the instructable, a lot of the quality is lost. In fact, a 300x500 pixel image ends up looking better! So what can be done about this? I could definitely upload smaller pictures, but I really would like to have the large ones there for people to see should they want to. I suppose the root of the matter is that I don't want people to think I'm posting lousy pictures when it's just the jpeg compression working against me.
Topic by jeff-o | last reply
Pictures used to display intermixed with the text of an instructable. Now all I see are the little 'icon' type pix for each step that are at the top of the instructable. The little pix are not enough to see the detail of what is being done in the instructable. How can I get the old display style back?
Topic by servant74 | last reply
Problem-i am building a large knex bazooka that needs a customized firing system. it needs to hold on to the projectile with some sort of fingers, which are to release when triggered from the rear of the holder, and the holder needs to ride in the rails of the gun, and it needs to be able to attach to a length of string. operation is-latch projectile in claws, pull both claw and projectile into barrel, pull to rear of barrel, stop motor, pull trigger, which through a series of levers will push to release on the back of the claw, launching the projectile. can anyone create such a claw as im stuck. ive got the gun, motor, gears, and projectiles, but i need some claw befor i build the trigger so they'll be compatible.
Topic by Nyanman | last reply
I have a large 8ohm speaker with a "12W500" rating, and another sticker saying 3/38/5 (QC check?) ~18cm Magnet and 30cm Cone. I want a signal generator for chladni plate (vibrating plate) I know how to make a signal generator from a 555, but i dont know how to drive the speaker magnet. Do I put the output to a "power transistor"? I have only used them for signal amplification before not power supply.. Will it run on 12V, 3V 24V? What kind of amps may it draw 200mA 500mA? 1A? 4A? I don't even know ballpark figures! Any tips, Circuits or transistor reccomendations will be VERY appreciated... I am fairly proficient at electronics, but this eludes me completely as it is taken for granted in most instances, or they use a 300€ amplifier.... I already build a signal generator. Cheers
Question by oliverkellow | last reply
This has been troubling me a bit: After watching Comic Strip Presents - Complete Collection [DVD] (I got it from HMV) I wondered about a segment from Mr Jolly Lives Next Door - In the film, the pair Mayall & Edmonson order 1,574 (large) Gin and tonics in a "traditional old-English illegal-drinking establishment" called The Neon Tee Pee. (Script can't be found, or un-blocked video clips any more) The thought occurred to me "How much did one large G&T; cost then?" We know that they had no money at all before receiving a brown envelope stuffed with bank notes. The brown envelope should have contained £3000 and I'll assume that it did. In being exact about the quantity of G&Ts;, I conclude that they knew exactly how much money they had, and how much the drink cost. If follows that all the £3000 was counted, why leave any in the van if you're going for that much alcohol? Later the £3000 is acknowledged, but 2 pound notes remain. At a maximum of £2998, 1574 G&Ts; work out at £1.90 each which sounds reasonable for 1983. But that leaves £7.40, and the £2 of course. What did they do with the £7.40, what was the £2 for, why did they not ask for 1578? Cigarettes? And if so, how many? Or is there some special significance to 1574? L
Topic by lemonie | last reply
I need to make gears that are approx. 4 feet in diameter for a float in a parade. The gears will line the perimeter of the truck and are going to be made out of 3/4" plywood with metal bracing on the teeth to prevent the plywood from chipping and attached to a plywood background. It would be awesome if we could alternate 4 foot gears with 3 1/2 or 3 foot gears for visual interest. It needs to look childlike - so we are not using sawteeth. I'm going to try to attach a picture with our logo for ideas. Any help with designing a template or where I could go to get measurements would be appreciated! Thank you!
Question by ttmoon | last reply
The Large Hadron Collider(LHC) is to be unveiled this year. It is designed to solve the much talked about energy crisis, and hopes to do so, but can it be worth all of it? From Wikipedia- (On October 25, 2005, a technician, JosÃÂ© Pereira Lages, was killed in the LHC tunnel when a crane load was accidentally dropped. The construction of LHC was approved in 1995 with a budget of 2.6 billion Swiss francs, with another 210 millionfrancs (Ã¢ÂÂ¬140 M) towards the cost of the experiments. However, cost over-runs, estimated in a major review in 2001 at around 480 million francs (Ã¢ÂÂ¬300 M) for the accelerator, and 50 million francs (Ã¢ÂÂ¬30 M) for the experiments, along with a reduction in CERN's budget, pushed the completion date from 2005 to April 2007. 180 million francs (Ã¢ÂÂ¬120 M) of the cost increase have been due to the superconducting magnets. There were also engineering difficulties encountered while building the underground cavern for the Compact Muon Solenoid. In part this was due to faulty parts lent to CERN by fellow laboratories Argonne National Laboratory or Fermilab (home to the Tevatron, the world's largest particle accelerator until CERN finishes the Large Hadron Collider).  The total cost of the project is anticipated to be between US$5 and US$10 billion. On March 27, 2007, there was an incident during a pressure test involving one of the LHC's inner triplet magnet assemblies provided by Fermilab and KEK. No people were injured, but a cryogenic magnet support broke. Fermilab director Pier Oddone stated 'In this case we are dumbfounded that we missed some very simple balance of forces.' This fault had been present in the original design, and remained during four engineering reviews over the following years. Analysis revealed that its design, made as thin as possible for better insulation, was not strong enough to withstand the forces generated during pressure testing. Details are available in a statement from Fermilab, with which CERN is in agreement.)
Topic by BkrevWlevqe | last reply
The Large Hadron Collider has been tested on 10, September, 2008.Look here on Wikipedia if you don't know what a Large Hadron Collider is.Proton beams have already been injected into the first metres of the LHC, to test the injection process, but the first attempt to circulate beams all the way around the LHC will be on the official start up day. If everything proceeds according to plan the beam will circulate all the way around the 27 km long LHC. Over the following months the LHC scientists and engineers will commission the LHC, running beams at higher energy with the intention of beginning collisions, using relatively low energy (5TeV) beams, towards the end of 2008.Continued on this link...
Topic by Plasmana | last reply
Hey, could someone please make an instrucable which enables your average person to make a tripod which can fit in ones pocket but expand to full standard tripod height when pulled out? Large tripods are too bulky to carry around, but small tripods aren't very practical for taking pictures from the right height.
Topic by ShaunHill | last reply
I need several glass tubes (10-20) that are around 30-40mm in diameter and 6 feet long. They also can't be rediculously expensive, I've been searching for a while, but all I've been able to find is glass with a length of 4 feet and a diameter of like 10mm. Any help?
Topic by guyfrom7up | last reply
I have a large outdoor wooden table, approx 2.4m long by 1m wide, made of spalted beech. Over time it has dried out and in places there are now large cracks in the surface, about as wide as a finger, all the way through the table top (about 10cm deep). What would you advise as best way to repair these ?
Topic by stevenpeeven | last reply
I know back a few years ago you could get huge sheets of cardboard from Home Depot and it was some great stuff, but now they dont do it. Does anyone know where to find large sheets of honey com or 3 ply cardboard these days? Or any 4' x 8' sheets. Thanks, Ethan.
Topic by mindstormmaster1 | last reply
I am currently working on a project which requires a larger NC switch. The concept is that when someone sits on the switch, the current will be blocked and not flow. When the person stands up, the current will flow through the circuit. This specific switch has to be flat enough for someone to sit on. Does anybody have any ideas on how to build one?
Topic by SamuelD79 | last reply
I am looking into a green power system but, I would need 4500 psi hydrogen tanks. They are way to small to be practical, even the large 144 c.f. ones (biggest I could find). Is there anything special about hydrogen storage tanks, or will any 4500 psi tank work, and does anyone know were to get big ones, like huge. If not, any ideas on how to fab one. I know a guy who is high pressure certified so he could weld it, but what thickness of metal is needed for say a 12" diameter tank about 10-15' foot long. (yea, that big)
Question by jj.inc | last reply
Hello, I am currently designing a large shed. I Have got the main look and all the lengths planned out, but I would be greatful l if someone was able to give my guidance of the constructiont, ei. Wood needed, The structuring of this wood and techniques etc. Electrics have already been planned out. I will be using insulation in the walls and floors. The walls will be plaster board, The building will need to be pretty structuraly sound so this is why I thought i would ask! This is all I have planned on construction so far. All feedback and/or critism is welcome! I have attached a sketchup file for better viewing aswell as a few photos! The sketchup file has the exact measurements. For the whole building it is 620cm x 350cm Edit: Sketchup upload has not worked so will give a link to it, I will also give out patches to anyone with very good advice! Sketchup link: http://sketchup.google.com/3dwarehouse/details?mid=df6f6cc57f109a415cde8f73f76c923&prevstart;=0 Many Thanks Oscar
Question by oscarthompson | last reply
Hundreds of picture frames in a family room is overwhelming and cluttered. Instead of having an individual picture frame for each photograph you want to show off, display all of your pictures on your wall with this plexiglas photo display found on anh-minh. You could have a few smaller versions of this in one room. Keep it tasteful by being conscious about where you place the displays and be sure to not clutter your walls!
Topic by Carleyy | last reply
I have an LCD that I salvaged from an old portable DVD player... I was wondering how it is possible for me to interface it with my computer. I want to do the project just for fun but I don't really know the first thing about controlling an LCD. Please help! I can post pictures and answer questions about the connections and stuff. I don't know the pixel width and height. Thanks! Sam
Question by martzsam | last reply
I have a Milwaukee Brewer themed golf cart and the only thing it is missing is a helmet for a roof. It needs to be just a basic 80's baseball helmet (no ear flaps...like the ones they used to give away at the game) that is big enough to cover or replace the top of the my EZ-GO golf cart (about 80" long). Has anyone seen one of these done before? What kind of materials would I use to fabricate something like this?
Topic by kermtfrg | last reply
Hi Guys, I need a simple switch with a large footprint to light up an LED bulb. I was thinking to use a 12 or 16 key membrane keypad or maybe an old keyboard keypad and rig it for this purpose but I've never used either of them for anything like this. My switch will be DC momentary switch with probably not more than 3.5V maybe 6V running through it off a battery. To make the entire keypad a sort of big single switch, would it be a simple matter of gathering all the positive wires from each of the keys together into one common wire and do the same with the negative wires or, maybe they have one ground wire? Then if any of the individual switches get pressed, will the switch activate ok? If so, if two or more of the keys are pressed at the same time, will that cause a problem, like a short or over heating? Please let me know. Thank you so much!!! Bretina
Topic by Bretina | last reply
Hey everyone, I hope im posting this in the right spot. I run a large farming operation and get my water from a well that pumps into a large storage tank about 10 feet deep and 6ft diameter. Because the well is very old I'm not able to add things like a float that will turn it on or off for me so I'm constantly having to check the well though out the day and if the cows are more thirsty one day they can drink the storage tank dry and that causes me problems with my pump, or if i leave it to long it will overflow and it makes a terrible mess. So im wondering if there is a way that I can wire up a water level indicator in the well-house and have a light board in my house that shows me the level of the well. So for a 10 ft deep well id have an led light for every 1ft or so and when the water level gets to the top foot a buzzer would go off and when it hits the bottom foot or 2 ft then a buzzer would go off. Ideally a wireless transmitting to the house would be best but I have no idea how that could work. And wired would be hard with the well house being a few hundred feet away from my house. I've done a lot of googling and haven't found anything that would suite a large scale water tank like this. I purely want to be able to see in my house where the water level is and have it warn me when its too high or too low. I apologize since i don't have a lot of experience in electronics. Any help is greatly appreciated as i have no idea where to start or if its even possible. Thanks guys!
Topic by rpfarm25 | last reply
So, recently, I was at school, and trying to use my laptop charger ( I was the only person in the room to be doing so) However, it didn't work. Using it at home, however, it instantly kicked the RCD or safety switch thing off, switching off everything running off the mains Upon further inspection, I found that the power cable had been damaged, so that the active wire was in contact with the ground wire. My question is, how come the power at school didn't get shut down completely ( the lights were still on, and wall outlets in other rooms around the school still worked) but at home, everything was completely shut down. I thought that there'd be at least a fuse or something, if not a safety switch...
Question by .Unknown. | last reply
The motor System So I am working on building a robot using wheelchair motors. I'm trying to control it via an arduino potentially but I'm not sure how to do this. My plan is to potentially use an 8channel 10 amp relay board connected to the arduino, but I'm not sure if 10 amps would be enough for the wheelchair motors? Also how do I go about actually powering the motors (12v Lead Acid Battery?) and interfacing that with the arduino (can I?). My other problem is that I would like to have at least a couple servos on each of two arms of the bot....so could I potentially control all that with the same arduino or would I need either a second arduino or an arduino mega with motor shield to do that? The navigation My other problem is navigating/control..... For that I'm thinking of using an ultrasonic ping sensor or two if that's possible, again I don't know if I can fit all these things on an arduino or not. and Lastly to actually control it, I know I should be able to program it autonomously with the arduino but what do you think is the best way if I wanted to be able to manually control the bot as well? Thank you so much for any guidance you guys can give on this large project!
Question by dstech | last reply
Hello. I'm in a bit of a hurry as there is a competition I want to enter by Friday but I just need to know before doing so if this is possible in theory. ( I only have to enter the image on Friday not the the object) My final aim is to have an intricate image laser cut into metal sheet (5' x 7'.) at a metal fabricator's. I have imported an A4 sized single colour tif. file into Illustrator and have converted it to a vector using Livetrace; it is now an ai. file. This as far as I have got . But the question is ; I plan to use one of the available convertors to change this ai. file to a dgx. file. Do I simply then take that to a fabricator and then that's it ? Have I missed out a hundred steps and complications ? Or is there a better way ? Or is it not possible to scale up an image this way? It's obvious that I don't know what I'm doing so any advice will be appreciated. Thanks FOH
Question by FriendOfHumanity | last reply
I'm so excited, I now have + hours of video to cut and share :)Today we:Finished the split standSet the finished plug in the stand and aligned our waterlineBondo'd stand and plug for a flange lineApplied mold release waxSprayed PVA (Poly Vinyl alcohol)Applied a polyester tooling resin with cabosil (A silica thickener) to serve as the inner mold face (outer shape/surface of final product)Applied 4 layers of chopped fiber with polyester resin (took about an hour and we're still a tad bit high - even with good ventilation)Mind you the resin is catalyzed with MEK-P (Methyl Ethyl Keytone Peroxide -- some call it rocket fuel. It will eat the flesh off the bone and then eat the bone.Why am I so excited? Because we finished today and the catalyzed resin was COOK-ING. "Too hot to touch" is about 180 for the average meat human. It's well above too hot to touch - in fact, the radiant heat is a bit much for most meat peoples. And that's with the prescribed 1% catalyst.More information coming soon :) It's going to take 8 hours to capture all that video :PPhoto: Adding more PVA to the pot in the middle of the second coat.
Topic by trebuchet03 | last reply
I am a collector and amateur restorer of wristwatches and I have a couple of projects which require purpose made watch cases. This is because they are old pocket watch movements that are typically 40mm plus in diameter and in one case the crown is at 12 o'clock not 3 like a normal wristwatch. The standard OEM watch cases are generally too small and I am looking for something a little more elegant (but still masculine) to show off these beautiful vintage movements and dials (as such I intend to use a crystal back as well as front). I would like to do one of the watches with a yellow gold front bezel (if not a gold body) to set off the gold leaf/plate(?) numerals and hands (on a white dial). The body, lugs and back crystal bezel could be in silver (may even be preferable) as the exposed side of the movement is predominantly white metal with gold train and jewel holes. I have been thinking stirling silver for the main body and perhaps 18Kt gold filled base metal or solid 18kt gold for the bezel. I have no experience with jewellry making and would be very grateful for any suggestions regarding techniques that a keen novice could use to get a professional result. I would also be looking at jewellers screws to connect the 3 pieces. Just out of interest the second movement does not have a particularly interesting or aesthetically worthy dial so I am toying with titanium for the second project...........
Question by handles63 | last reply
I used to be very active on this site MANY years ago. However, school took priority and I let knex sit for a while. Now i'm kinda interested in the physics of it. However, it seems as though the community has died a bit. If ANYONE is still involved in the knex gun making community, PLEASE comment here! I'd like to gauge how large it is. THANKS!
Question by knexsniper1 | last reply