Search found 342 matches

by Gepard
Sat Oct 06, 2007 10:34 am
Forum: General How-To & Discussion
Topic: High-Tech Pneumatic?
Replies: 36
Views: 5639

You won't have much control though - DC motors are the best way IMO......
by Gepard
Sat Oct 06, 2007 8:07 am
Forum: General How-To & Discussion
Topic: High-Tech Pneumatic?
Replies: 36
Views: 5639

You can make something like this (he's a SF member BTW):

Just remember to reinforce any bits where recoil could bend it.

It all depends on the size of cannon your going for.
by Gepard
Sat Oct 06, 2007 7:10 am
Forum: Pneumatic Cannons
Topic: How to make a Supah Valve
Replies: 20
Views: 4454

Pictures of the insides of a Supah are in the Wiki
by Gepard
Sat Oct 06, 2007 6:46 am
Forum: SpudFiles Discussion
Topic: something that needs to be added.
Replies: 42
Views: 6160

But surely then don't you cut down the posts they can search? And if you do make them visible they'll be "how do I post in these forums"?
by Gepard
Sat Oct 06, 2007 5:44 am
Forum: SpudFiles Discussion
Topic: something that needs to be added.
Replies: 42
Views: 6160

So they only see one forum and post all their stupid questions in that and then what, all the forums suddenly appear?
by Gepard
Sat Oct 06, 2007 5:40 am
Forum: SpudFiles Discussion
Topic: something that needs to be added.
Replies: 42
Views: 6160

What we need is a system where members can flag posts (or threads) as unsuitable (rude/didn't search/dangerous take your pick) and then if the number of people exceeds a certain point it gets deleted automatically or moved to another section where if theres a huge fuss over it mods can move it back....
by Gepard
Fri Oct 05, 2007 7:02 pm
Forum: Pneumatic Cannons
Topic: Grey Electrical PVC???
Replies: 4
Views: 1285

Cap it off and hydrostatic test it till it bursts. Repeat as many times as you can, then divide by 3 to give you a max working pressure.
by Gepard
Fri Oct 05, 2007 7:00 pm
Forum: General How-To & Discussion
Topic: High-Tech Pneumatic?
Replies: 36
Views: 5639

Singularity, you suggesting he uses tiny stepper motors from CD drives hooked up to a '84? *Shudder* Not sure how high-tech your looking at going.....but if you want top of the range look at using a DC motor with either optical or magnetic (hall effect) feedback. Servos are too small, slow and expen...
by Gepard
Fri Oct 05, 2007 11:55 am
Forum: General How-To & Discussion
Topic: Solvent Welding Course Recommended For ALL
Replies: 46
Views: 52527

I did it and got my certificate sent a few weeks back.

Didn't think they'd send it to me in the UK.......
by Gepard
Tue Oct 02, 2007 3:29 pm
Forum: Off-Topic Hobbies
Topic: Sling Shots
Replies: 11
Views: 2153

Launch Pete's M48 nuts :D
by Gepard
Tue Oct 02, 2007 12:57 pm
Forum: General How-To & Discussion
Topic: Customs - need a cover story.
Replies: 69
Views: 8647

But if BB guns are banned, I can't see them allowing a 16yo to make an air cannon.......
by Gepard
Tue Oct 02, 2007 12:46 pm
Forum: General How-To & Discussion
Topic: Customs - need a cover story.
Replies: 69
Views: 8647

Say you need PVC tube/sheet and imperial pipe is the right thickness....

Otherwise won't they just ask you why your not using metric?
by Gepard
Mon Oct 01, 2007 3:55 pm
Forum: Pneumatic Cannons
Topic: Foam pistons
Replies: 32
Views: 5251

The best way would be too make a polystyrene one then just add a couple of layers of fibreglass (using Epoxy resin as polyester melts polystyrene). Should make them strong and light in fact that's how they make nose cones for rockets for exactly that reason, and it shouldn't cost a alot at all.
by Gepard
Mon Oct 01, 2007 3:52 pm
Forum: Pneumatic Cannons
Topic: large cannon
Replies: 20
Views: 2806

I'd be surprised if you couldn't send it.....Even if X-rays can't penetrate it (I think they'll show up on an X-ray since they're a different density to the body though) then they'll just open it up if they're that suspicious. I believe they get dogs to sniff them out first and then X-ray them if th...
by Gepard
Mon Oct 01, 2007 1:07 pm
Forum: Pneumatic Cannons
Topic: Foam pistons
Replies: 32
Views: 5251

You can't compared the polystyrene cups and the "blue foam", they're both polystyrene but different manufacturing processes. Technically you shouldn't call the cups Styrofoam as thats a Dow Registered Trademark for the blue (and pink) polystyrene boards. And the Styrofoam boards won't compress anywh...