I made a cool mechanism. I don't know what it can do, but maybe someone will find out. Here is a video. I also updated the pictures and video.
Topic by Mintyhippo | last reply
I have tried to build a sear system on some of my guns, but it is so hard! I built one that kind of worked but couldn't fit on my new rifle that i just made (i might post but has a block trigger right now). Who knows how to build one of these sears, and is it really worth it? What if a block trigger just works better?
Topic by Mintyhippo | last reply
Hello everyone, I want to create feeder cart with seperate section, that will be hangin on rails. Feeder cart will have four positions: First one (First load) will be bottom gates closed, middle gates open to the top. Second (Second load) will be bottom gates closed, middle gates have to be locked in horizontal position. Third position (First unload) bottom gates open, middle gates have stay locked. Fourth position (Second unload) bottom gates open and middle gates also open, that stuff drops out. I want ask you advice how to design bottom and middle gates open, closing and locking mechanical mechanism (without any electronical parts). This feeder cart will be operating by one man. I have created middle gates mechanism, but maybe you have better solution. I really appreciate for any ideas. Sorry for my english mistakes. English is not my native language. Link to my feeder cart design: https://cad.onshape.com/documents/9bf2057d221de0e07143093b/w/42b5cff40a9a1fb3bed3cb14/e/cbc213062709ad380b4cb17b
Topic by DonatasD4 | last reply
I recently motorized a mountain bike and it is great. I bet I can top 40MPH!! Only problem is, I have no way of knowing for sure how fast I'm actually going. I could buy a digital speedo for like $10-20 but I want the look of having a speed gauge on my bike, plus it's a little harder to read a digital speedo at a quick glance when the screen is like 2 inches long and wide! I saw this mechanical speedo on ebay for $10-20, but some reviews of it on other sites says it breaks really easily, or as soon as it hits 30 MPH it goes crazy. Does anyone know where I can get a reliable mechanical (analog) speedometer?
Question by aeronut01 | last reply
My rear disk brake is in a sad state. I squeeze the rear brake lever as hard as I can, yet, my stopping power is nil. I wiped down the rotor with rubbing alcohol, but to no avail. It might also be relevant that I ride frequently in snow and slush, and also in dusty areas. The bike is the Specialized ''Rockhopper," 2009 edition, with about 450-550 miles put on it. What can I do to fix the brake so that I won't have to rely on the front brake?
Question by tincanz | last reply
So I am trying to do this instructable here >>https://www.instructables.com/id/How-To-Build-A-Catapult/ and the author doesn't seem to be answering questions anymore. I am wondering if anyone else knows what to do with the firing mechanism if using fibreglass pipe. Because if a hook is screwed in it, it seems like it would probably break out of it under the strain. Anyone have any ideas what i could do for the firing mechanism? Thanks!
Question by Tin.Man | last reply
I am thinking of using modified jack stands on the ends to hold up the spit or pole the hog will be on. I need something simple but safe. Thanks
Question by tall1smokey | last reply
Https://www.instructables.com/id/Make-a-Two-Bladed-Pocket-Knife/ could this be rendered to have a lock on the side
Question by daniel123456789 | last reply
I need create a machine for cotton picking can anyone suggest an idea for harvesting the cotton upto 150 to 200kg per day so what can I do that and what mechanism is followed for that?? and what are setup should be made for making a machine for that cpacity
Question by SaiV72 | last reply
Hi ppl, thinking about building a tandem bike (with the idea of turning this into my mechanically powered water raft) and just wondering if anyone had advice? or, an Instructable on how to do so, had a quick look on here and couldn't find anything so any links would be appreciated. Thanks
Topic by drummer ian | last reply
Check out the Top 5 April Fools' Day Pranks You Can Build in the Office I put together for Popular Mechanics! Certain holidays seem to have been created for DIY-ers, and April Fools' Day is certainly among them. No store-bought hand buzzer can stand up to a well-built, well-executed homemade prank, so we asked the chief geek from the gonzo builders at instuctables.com to pick his favorites from their new practical joke contest. Once you're suitably inspired by these projects, share your own antics right here to win $200--and enter PM's DIY Rally 2008 (only one day left!)
Topic by ewilhelm | last reply
I am working on desighning an airsoft "noob tube" or grenade launcher, and plan to make a modular fuel/payload combo as shown in the picture. my only problem is I need an efficient way to transfer propane from my tank, shown in picture, to the assembly.
Question by the mechanical engineer
I ordered these bearings from mcmaster to use in my new electric bike that i'm building for my senior project, but they spin really easily and im not sure wheather or not im supposed to grease them. and if I am, what kind of grease would be best? http://www.mcmaster.com/#ball-and-roller-bearings/=b15r5n
Question by the mechanical engineer | last reply
High wheel bikes have a bigger wheel that would turn the generator more often per pedal. right? Would there be a greater mechanical advantage? or would it just increase the work load like going into a higher gear?
Question by Houdinipeter | last reply
Hello there, I was wondering if you could help me: I need a simple program to design a basic gear, a pair of twin wheels. I need to set the number of cogs and the diameter of the wheels; this mechanism has to be as tight as possible. The idea is to print the wheels on paper and then cut a metal sheet accordingly; can you tell me a way to transfer the image directly on the metal? That would be of great help... Thanks.
Topic by Madness helps | last reply
This is the latest design of my new rifle. it is a pump-action RBG rifle, that has semi or full auto capability. it uses a fairly small amount of pieces and has a detachable stock and extendable barrel. it is true trigger, and uses a new design for the fireing mechanism. i need atleast five people to ask me to post it, or i won't bother. comments welcome, and if anyone wants more pics, just ask.
Topic by Rage | last reply
I have 2 horses and have composted their manure since I've had them (5 years) but have always had to shovel it into a small wagon and spread it with the shovel and rake. It gets pretty tiring. I thought maybe a wheel driven type? I'm not very mechanical, but if someone can help me out with this I would be sooooooo greatful!
Question by sparky1856 | last reply
I've been reading a lot of information air cannons, some say it's better to have the chamber, directly and back up the barrel for best performance.some say it doesn't matter, it's all in the trigger mechanism. What is the best, piston or sprinkler valve? Thanks I actually do have a lot more questions but I feel the need to be brief.
Question by Leedo | last reply
I have a 1978 suzuki dt25 outboard which is running a 6 spline/key way propellor shaft. since a 6 spline propellor is incredibly hard to find these days could i replace that shaft with a 10 spline shaft which is more common? cheers. william horton
Question by billbobaggens | last reply
I know this site has a fair amount of people who truly do airsoft. I just got one and i was wondering what you think. It's a Colt M1911A1 i got from Dick's sporting goods. I'm not doing battles or anything, it's just for fun. Price: $34.99 Ammo i use: 20 gram white pellet Magazine capacity: 12 Firing: spring Material: mostly plastic, but mechanics are metal. FPS: 315 So, what do think? 1-10.
Topic by NYPA | last reply
I know this is kind of random, and I just now, moments ago, accidentally discovered this, but there is a GOODHART's LAW :-) It states: once a social or economic indicator or other surrogate measure is made a target for the purpose of conducting social or economic policy, then it will lose the information content that would qualify it to play that role. This almost sounds like a parallel to the famous Quantum Mechanics rule of effecting the state of a particle by observing it. This bulletin was brought to you by the Totally Random Goodhart Reseach and Useless Information Recovery team. Thanks for reading.
Topic by Goodhart | last reply
I live in northern New Jersey. My summer project is to build an electric bike/motorcycle. I plan on using a regular beach cruiser pedal bike, removing the pedals and mechanism, and powering it with an electric motor. I'm estimating it will go anywhere from 20-25 mph. I know the laws about mopeds and motorcycles, but what would this fall under, since it will be custom and home built? I'm using Radioactive_Legos' Flat Tracker as a reference https://www.instructables.com/id/48V-Electric-Flat-Tracker/
Question by AudioMaximus | last reply
I used my nerf vulcan EBF-25 for a long time, then one day it just stopped working. I opened it up and fixed the tooth moves the belt advance wheel, then I put it back together. When I tried it in full-auto the belt advance wheel wouldn't move, and the firing mechanism wouldn't work. Oh and the only modifications I made on it was conbineing the two belts and pounded out the air resistors from the belt. Any help is welcome.
Question by Nerfgenius | last reply
The cabin came with an outhouse when we bought it, but now, 8 years later, we have to do something soon. I've looked into composting toilets, but I'm not convinced that $1,000+ later that the mechanisms will be easy to maintain. We want it to be as no-fuss as possible. We leave no heat on in the winter, and our water is a long distance down 4+ flights of stairs and to the back of the property. We pump it up (recent) or hand carry it in buckets. Can we assume that if the current outhouse is working well with the soil that a new outhouse about 6 feet to the right of it will work well, too?
Question by cabingal | last reply
So I have purchased a 25cc 2 cycle homelite brand trimlite weedeater, and have decided to put it on a bike. my drive system of choice is friction drive. i have a 1 in diamater alluminum knurled roller that is held on by set screws. my question is, it doesent work. i have no cintrifigul clutch, so i must first pedal to start the bike. then i throttle on the motor and stop peadaling. the motor turns on, but quickly bogs down and dies, and i don't know why. am i doing something wrong? please help. this is very close to the system that i have. https://www.instructables.com/id/How-to-Strap-a-Leaf-Blower-Engine-to-a-Bike-and-Go/
Question by the mechanical engineer | last reply
I am having my first halloween in my first house. My neighbors said they go all out for holidays, and I've always wanted an awesome halloween haunt. My only problem is I've never had any electronic experience past screwing in a light bulb. I don't want to attempt programming dealing with relays or microcontrollers, etc yet. I'm just looking for things that will be fun and basic. Any body know of any ideas to get my props moving without zapping myself?
Question by lpfan3217 | last reply
Mechanic said that it was water in the gas... the tank has been emptied, the carb cleaned, new plug, and new blade. It still stalls after about ten minutes of running, and then may start back up when it's cold.... I've been thinking that it is a coil problem.. That's the only thing left unchecked because it fired up at the shop , so they sent it home.... And I am curiouse to know a safe way to check a coil while the engine is hot... I have a multimeter, I just don't know how to use it on a coil , or what readings I may be looking for. Thanks for any advice I can get Slacker
Question by slacker0473 | last reply
For the past 2 days I've been working on a new fully automatic mechanism, and heres how it works. This new system uses a 'Rack and pinion' which starts off with the pinion pulling back the firing pin until it has no more teeth to grip to the firing pin with so it lets go and the firing pin goes flying forward shooting the bullet. after this the firing pin is returned back to its original position it is ready to be pulled again, this all takes around 2 seconds. Range: around 15ft(Blue rod) Firing rate: every 2 sec remember this gun is only a prototype so suggestions are welcome (needs a hopper), and remember that this gun only uses a weak motor so if you were to use a motor like the one a on oodalumps machine gun and with that you could possible double the range and firing rate! Enjoy:)
Topic by Shadow64 | last reply
I want to make a tiny (about the size of a standard watch) circuit that emits a human-like voice(may sound very electronic) or even a siren at a very high volume(100DB or so)..sort of like a personal alarm system.I know such systems are already present, but I want to make one myself(to gets ideas for further miniaturization)...I'm sorry if I sound like a noob, but I'm a student of computer science and know VERY little about electronics(do want to learn though) any ideas in this direction?should I start off with an amp or a mechanical siren(like the air raid ones). I have very little idea in this regard and just need a start off point. (or should I just get one of those sirens and try to reverse engineer it?)
Question by gaurdianknight | last reply
Very long story short, I'm making a BB gun. I've got the basic ideas and mechanics almost done, its just a matter of making it work and materials. One of my big problems right now is that the gun will be .177, but it's going to mimic the look of an old flint or caplock muzzleloading pistol, which ranged from .36 all the way up to .80 in the largest ones. Obviously the barrel will have to be concealed within a larger, false barrel. My problem is making the real barrel attach securely without negatively affecting accuracy because it's off center. fitting the breech of the real barrel with a nut or a thread insert has crossed my mind, but I'm not sure if It will be enough. pictured are some examples of caplocks so you have an idea of what the finished product is planned to look like
Topic by Bando_Red | last reply
Eepybird, the "Coke and Mentos Guys" used 108 2L bottles of Coke Zero and 648 Mentos to propel a car/bike 221 feet! An explanation of how it works, from their YouTube video: "The Coke Zero & Mentos Rocket Car uses a piston mechanism: a six-foot long rod sits inside a six-foot long tube attached to each bottle of Coke Zero. When the Mentos drop into the soda, the pressure tries to push the rod out of the tube. With 108 rods all pushing at once, that gives us a lot of power. All that power is pushing against a wall braced with 3,600 pounds of cement blocks. So all the force is directed into moving the Coke Zero & Mentos Rocket Car forward. We get one big push for six feet, and then it's all coasting from there." via msnbc
Topic by Jayefuu | last reply
Hello you all, Not new from visiting, but anyway, I have these parts, etc, that I am hoping someone is able to tell me a way, or how I can use them, to build an aeg, or something of the like _ a few motors with a gear on them. Some plastic gears. Airbrush thing from testors, and propellant can, the remains, everything but the gearbox, one of the gears. the remains of a umarex, sig 5522 commando including the plastic outside, mag, and all, just the gearbox is totaled, and so is one of the gears, and the one of the soddered on cable joints to the motor has come off again. plenty of large and small springs. maybe some wood if any, paperclips. With the stuff, or some mentioned, Can anyone tell me how I can make a mechanism, or something so the sig can shoot again. ;D would greatly appreciate help. Crews
Topic by ccrews
No, I'm not hear to recruit.... A friend of mine recently signed Delayed Enlistment paperwork (Army)... The final decision is all him (he's 26 - capable of decision making) - I'd appreciate not having the negative sentiment at the moment (I'd rather not get into the personal story and such).What I would like to know... Does anyone know of specific details to look at on his contract? I know a few vets that have been screwed over in benefits after getting out (especially in the money for school details). I've already found one lovely "gotcha" that locks his GI Bill rates at the time in which he signs - NOT the time in which he is discharged or when he begins to use those funds (the GI bill is what gives vets money for school for those wondering).So does anyone know specific details to look out for? This is a 3+3 DEP contract (3 years active - 3 years army reserve). He's scored very well on all of his tests, and is going in as an E3 rank (he'll be a turbo machinery mechanic).
Topic by trebuchet03 | last reply
I'm pretty keen to build a motorized go-cart with my friend, but we both have run out of chores to do for money, too young to get a job and are on a pretty low budget. We've already got a go-cart that doesn't have a motor, but is well-built (welded frame) and has a proper steering mechanism (not just rope attached to the front axle). Two questions: Would it be easier to make an entirely new go-cart or to adapt the go cart we've got now to suit the engine we get? And What's a cheap option for a motor that has some torque and can go around 40-50km/h? I'm talking cheap like under $100NZ (around 70$US I think?) EDIT: PLEASE DON'T SAY BUY A LAWNMOWER ENGINE UNLESS YOU CAN GIVE ME A DETAILED DESCRIPTION OF HOW TO USE A LAWNMOWER ENGINE ON A GO-CART - Lawnmower engines have vertical driveshafts, and you can't just tip them sideways. A V-belt is not ideal.
Question by DELETED_isaacwilk | last reply
My electric bike, seen here, was built for my senior project. I was limited on motor choice, and had to go with the best I had, an old powerchair motor. After 2 successfull attempts at building an electric bike, I have discovered that it is impossible to go faster that 25 mph with with one of these motors. As you can see on my instructable the bike has 6 speeds, with a top speed of 20mph in first gear. however, when I shift gears, the motor rpm's decrease instead of the speed increasing. I have heard before that it is possible to run an electric motor at higher voltages than it is rated, so I was wondering, if i could add a seperate switch and a "booster battery" of sorts, that as long as I monitered the voltage so as to not let exceed 24 volts, if this would be feasible. My only other option would be to add a second motor in parallel with the first, and on the same drive belt. The first option would be the easiest, if it could work without damaging the motor. Any help would be appreciated. Thanks, iloveairsoftstuff
Question by the mechanical engineer | last reply
I need to know how to install a water system from my well asap. Full details of hookup. I have an existing well with a submerged pump in it, but don't know if pump still works. Presently digging it out to put power to it and find out. Water "spout" coming out of ground also plugged and am trying to clear. I have a pressure tank ordered that I hope will work. Pipe to house all ready dug, checking patency and damage. If pump doesn't work, is it repairable?, ie., how does it work so I can repair. How does pressure tank work? Any tips to make this easier are greatly appreciated. I am senior, disabled gal who is at war with water company because they are partially, if not completely, responsible for my house burning down a few months ago. I lost everything. I am OK with a good basic knowledge of mechanics, but this has me stumped, pls offer any comments that will help. I am not the only person of my community victimized by our county government. RClark0240@att.net
Question by RClark0240 | last reply
I've been tooling for one of these for ages, or how to build one. It has to be low-tech: no electronics, no batteries if at all possible. I want to measure the highest-speed winds per day, not the actual windspeed at that particular moment. I live in a wind-tunnel and I'm curious to know just how strongly it blows My very vague idea was: windsock with a cord attached to the far end gauge with vertical slider, wind speeds marked, sliding part fitted with ratchet system so it can move up freely, but not down again cord on the end of the sock connects to the back of the slider: theory: the harder the wind blows, the higher the end of sock will be lifted, and the higher the slider will be pulled. Each day I'd be able to take the highest reading, then reset the slider back down for the next day I've got a cheap cup anemometer but I've no idea how to use its rotation speed to make measurements of course, marking the gauge accurately would be a bit tricky! Does anyone have any thoughts/tips/suggestions? Thanks! I've been looking vainly for "mechanical anemometers" but usually get the "take four paper cups" type, or the pukka ones at £££ or $$$. it'd have to stay outside all the time, so a battery one wouldn't be much use
Question by HelenaTroy
Some time ago, Lost started on British TV. I'd heard it was good, but I missed the pilot. I also heard that, if you missed the pilot, nothing else made sense. So, I avoided watching the series, figuring I'd catch the repeats. ...and suddenly they're on season five, and I haven't seen any of them! So, I bought season one on DVD. Seven discs, twenty-five episodes and a bunch of extras. I picked it up on Saturday, and despite spending a day in school, and a day visiting a friend and her new baby (awww.....), and managing to hunt down my first Mediterranean Gull, I've just watched episode 13 17. Please, no spoilers, I just wanted to say... Whoa! UPDATE: All done. Twenty-five episodes, and the extras (except the commentaries - I don't like commentaries). We never got to see the Big Scary Monster (although it sounded distinctly mechanical by the end), we never found out where Ethan came from, nor the polar bears. What about the four on the raft? Last we saw it was still burning, and little Walt! So, I'm now haunting ebay for Season Two - we need to find what's down that ladder....
Topic by Kiteman | last reply
So... While brushing my teeth - I first rinse my brush, turn the faucet on, brush, then rinse the sink/mouth. Yes, I turn the faucet off while brushing. And if you're counting - that's two on/off cycles per brushing...I've been playing with this tool: http://www1.eere.energy.gov/femp/procurement/eep_faucets_showerheads_calc.htmlAnd I pose an open question for discussion.. But first, my data/research...I'm estimating 3 minutes of use per day - 365 days/year. According to the tool... I use 2190 gallons per year. Lets say that's 5 uses per day (2 for teeth - 1 for bathroom use). The tool seems to estimate an 8.4 year service life - so that's a total of 18396 gallons of water over it's life as a faucet.So If I leave the water on while brushing - that's 3 on/off cycles per day.butIf I turn the water off while brushing - That's 5 on/off cycles per day (40% more cycles).Realistically, a faucet's wear comes from on/off cycles - each use bringing it closer to retirement. So 40% of 8.4 years is 3.4 years.Now... Leaving the faucet on an extra 4 minutes per day (2 minutes per brushing) consumes 2920 gallons of water per year.The difference over 8.4 years is: 30660-18396=12264 gallons. At about $4 per 1000 gallons - that difference is $49.06. BUT, the direct replacement for my faucet (as priced today in home depot to the exact model) is $75. So after 8.4 yearsFaucet remaining on will cost me:$49.06 + $75 = $124.06Faucet being turned off will cost me:$75 + $30(prorated cost of faucet for 3.4 years of wear on a new faucet) = $105Differences:$19.0612,264 gallons of waterThat is to say - due to extra wear on my faucet - it's only marginally more economical to turn my faucet off while brushing my teeth. If I wasn't me, and not able to DIY replace - it very well may be cost effective to leave it on given the cost of a hiring a handy man or plumber...Okay... Now that you've read the above... please discuss your thoughts. I am very much aware of the assumptions I have made (no need to point them out) - just looking for opinions :)UpdateLets turn this discussion on it's head now... As several have pointed out, conserving is more important - bonus as it's close to an economical wash in my fictitious scenario above (it's not 100% real and based on data from the link above and some hefty assumptions).My car uses .3 gallons of gasoline per hour at idle. Lets take a 100% city drive in heavy traffic (my drive yesterday). I was at a complete stop due to traffic lights or traffic for 20 seconds or more a total of 12 times to travel ~10 miles (yes, I freakin timed it). So that's a total of 4 minutes (wow, that worked out nice) of idle time. That time consumes 0.02 gallons of fuel costing me $0.06. If I were to make that commute 5 days a week, twice daily - that's a cost of:10.4 gallons of gasoline$31.2 worth of fuelSo, a new starter for my car costs $130. Typically the motors don't actually die - just the contacts. But lets assume I don't want to fiddle with that and just want to direct replace (corollary to valve washers :D).This means - using my starter an additional 24 times per day - it will take 4.2 years for the fuel savings to pay for a new starter. In 4.2 years - averaging 12,000 miles per year - I will have traveled 50400 miles.Okay - now lets consider the cost of fuel to restart - 24 times.... According to mechanical engineering magazine, a V6 engine used 5 seconds worth of idling gasoline to restart. So - redoing some math to compensate - that's a savings of7.8 gallons of gasoline per year$23.4 per yearTime to recoup 1 starter: 5.6 years (equating to 66000 miles)So, I'm having some problems finding data on starter life cycle - all I have is anecdotal evidence... *My personal car has 115K miles and is ~8 years old - and I've been doing this since I bought the car >2 years ago. *My last car was sold at 98K miles and this was done for a little less than 2 years (the car was 8/9 years old when sold).*My first car had unknown mileage (estimated around 150K), was 10 years old and the engine was killed at stoplights.*My parents own a conversion van (seldom used now) that is 12 years old, 120K miles - did not shut the engine (v8) down at traffic lights.None of the cars above have had their starter go.*Father had a truck that had it's starter replaced around 220K miles - unknown age. That car left us with a blown connecting rod around 300K milesBatteries... Yes, this does put more strain on your battery... I'll go more into that when I can find some better data (more than anecdotal :p)...But, that's to say... It's economically viable to turn off your engine at traffic lights... So much so, it's illegal to idle (over a certain period of time) at traffic lights in some countries...
Topic by trebuchet03 | last reply