Well I'm guessing that the box that plugs into the wall is some kind of inverter. But I honestly have no clue. I just figured that if it was a dc motor that plugs into the wall there would have to be some form of inverter.

Looks about the right size for a drill press. No more stepped belts. :) Check with the manufacture of the speed controller. Most have programmable ranges. Items such as accelleration, minimum, braking rate, maximum speed and such are often just software parameters. [/url] Unfortunately I don't thin...

Anyone have any cool ideas for what to do with a large industrial motor? There is a separate speed controller that allows the RPMs to be adjusted from 100 to about 700. And there is also a large inverter/power supply thing. Only the motor is pictured below. I was thinking either a compressor, a fan,...

I've never done it so I'm not sure, but can't you build your own model rockets with cardboard tubing and wooden fins? It seems like you could make one with more room inside. And you could use multiple rocket motors. Even if it was a complete failure, it would be hilarious. I kinda want to do this no...

A pocketwatch without the band is very light and an electric match is pretty much weightless.

Ok, if you wanted to make a time release balloon, couldn't you use a shitty digital watch with an alarm? You could connect electric fuse (the ones used to launch model rockets) wires to the little speaker connections, so you could set a ~5 second alarm and then you would need that igniter to somehow...

I'm bored and have a surplus of money. I want to build a PVC (or other pipe) raft that can be used to haul things. Like my friend's jetski could tow it and we could load coolers and maybe 1-2 people on it for island parties. I was wondering if there are any useful ways to maybe make the raft self-po...

Sorry to double post, but could anyone give me a quick answer? It's all I need to know to start buying parts. Thanks!

I've never messed with QEV's or homemade piston valves (I've made a modded sprinkler), but could I basically make the above cannon with a QEV replacing his homemade valve? Seems like it should work, but I want to know if I'm right before buying a QEV online.

Thanks

Do most metal water bottles have a common thread size for the cap (for use as an air chamber)? If so, what is it?

I'm looking to make something similar to this:
http://www.spudfiles.com/forums/viewtopic.php?t=15091&

Also, if you can be bothered please suggest proper barrel/chamber sizes.
I would like the barrel to be ~4-5 feet long.

And any other suggestions/ideas would be great!
Thanks.

Pneumatic Idea: 3" SCH 40 Chamber: -Schrader Valve -Quick Connect Valve (maybe, in addition to the Schrader) - ~80 psi Relief Valve (to maintain continuous pressure without explosion) -0-100 psi Pressure Gauge 1" Sprinkler Valve -Modified w/ Blowgun Valve, electric solenoid sealed w/ epoxy putty) 1....

no your both just not doing it right.

other people have used it in he past to great success

Yeah...Which is why I'm confused. I've tried everything.
Oh well, hair spray might be worse for the cannon, but at least it works.

Ok, I just did a quick test.
For some reason, I spray in a small amount, put on the cap, ignite, nothing happens. But then when I take off the cap and try to ignite it, it ignites.
???

I've tried using just quick sprays, and I have been airing it out. I'll try using a small amount later. I know I'm not using too little, that's for sure.