ARGHHH Pistons

[sagthegreat]

I am currently building a Pneumatic Pen Gun, and have been browsing the forum. I was wondering If anyone would like to tell me what i should make the piston and barrel seal out of. thanks
-sagar

[killerbanjo]

I used hot glue for the piston and 1.5mm neoprene sheet for the piston head.

Epoxy would be better though. You could also use as solid rubber piston from a 6mm sheet like this one...

http://www.ebay.co.uk/itm/6mm-thick-neo ... 2a192ac127

[sagthegreat]

isn't a 6mm piston too thin? also how would I make one out of epoxy. thanks

[killerbanjo]

No, should be thick enough providing your careful with the mesurments. But if your worried about not geting it perfect make an epoxy piston with a 1.5mm head, hot glue if you have to but epoxys better.

[pneumaticcannons]

Try getting ahold of rubber test tube stoppers. They work great and are more than thick enough. Then just sharpen a pipe the same size as your chamber and drill a piston out.

[sagthegreat]

OK thanks hopefully I won't have any problems thanks

[jackssmirkingrevenge]

Solid rubber pistons are simple and effective.



http://www.spudfiles.com/forums/mini-0- ... 20101.html



Cut from rubber sheer with a sharpened piece of chamber tubing, be careful though

[sagthegreat]

how did u sharpen the tube, and were did u get rubber that thick, and a skin piston looks like a good idea




*Also would e-6000 epoxy be suitable for attaching brass parts?

[jackssmirkingrevenge]

how did u sharpen the tube

1) clamp drill in vice

2) clamp piece of chamber material in drill chuck

3) use file and sandpaper to sharpen

and were did u get rubber that thick

found it at work, but there are plenty of sources, synthetic wine corks for example.

and a skin piston looks like a good idea

No.

Also would e-6000 epoxy be suitable for attaching brass parts?

Is it actual two part epoxy though?

[sagthegreat]

ok i got the barall attached, now i still cant find a suitable piece of rubber for a piston, have any ideas?

[sagthegreat]

also, can someone describe how snug the piston should be in the main housing
(srry for being noob)

[Gun Freak]

You should be able to move it by blowing in the pipe. For rubber, bike inner tube, some mouse pads, rubber washers, etc.

[mark.f]

I'll have you know spousal abuse is a serious offense no matter which side of the ocean you live on, jack.

ok i got the barall attached, now i still cant find a suitable piece of rubber for a piston, have any ideas?

Check a plumbing supply store. They ought to have tap washers in the thickness you need which you could cut a 6mm piston out of.

[sagthegreat]

but mouse pads have holes in them...

[jackssmirkingrevenge]

http://www.ebay.com/itm/25Pcs-Rubber-St ... 20c2fea32a

ten bucks, loads of potential mini-pistons.

I'll have you know spousal abuse is a serious offense no matter which side of the ocean you live on, jack.

No no, it's my right hand