SpudFiles

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

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

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

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.

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.

OK thanks hopefully I won't have any problems thanks

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

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?

sagthegreat wrote: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?

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

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

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

jackssmirkingrevenge wrote:

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

sagthegreat wrote: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.

but mouse pads have holes in them...

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