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ARGHHH Pistons

Discuss miniature cannons built from things such as pill bottles and pen caps.
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ARGHHH Pistons

Unread postAuthor: sagthegreat » Sat Feb 18, 2012 12:15 pm

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
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Unread postAuthor: killerbanjo » Sat Feb 18, 2012 12:36 pm

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
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Unread postAuthor: sagthegreat » Sat Feb 18, 2012 5:05 pm

isn't a 6mm piston too thin? also how would I make one out of epoxy. thanks
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Unread postAuthor: killerbanjo » Sat Feb 18, 2012 5:13 pm

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.
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Unread postAuthor: pneumaticcannons » Sat Feb 18, 2012 9:25 pm

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.
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Unread postAuthor: sagthegreat » Sat Feb 18, 2012 10:56 pm

OK thanks hopefully I won't have any problems thanks
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 19, 2012 1:18 am

Solid rubber pistons are simple and effective.

Image

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

Image

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

Image
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Unread postAuthor: sagthegreat » Sun Feb 19, 2012 2:00 pm

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




*Also would e-6000 epoxy be suitable for attaching brass parts?
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 20, 2012 1:30 am

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 :P


No.

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


Is it actual two part epoxy though?
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Unread postAuthor: sagthegreat » Mon Feb 27, 2012 5:53 pm

ok i got the barall attached, now i still cant find a suitable piece of rubber for a piston, have any ideas?
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Unread postAuthor: sagthegreat » Mon Feb 27, 2012 5:59 pm

also, can someone describe how snug the piston should be in the main housing
(srry for being noob)
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Unread postAuthor: Gun Freak » Mon Feb 27, 2012 6:01 pm

You should be able to move it by blowing in the pipe. For rubber, bike inner tube, some mouse pads, rubber washers, etc.
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Unread postAuthor: mark.f » Mon Feb 27, 2012 6:01 pm

jackssmirkingrevenge wrote:Image


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.
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Unread postAuthor: sagthegreat » Mon Feb 27, 2012 6:03 pm

but mouse pads have holes in them...

:)
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 28, 2012 2:37 am

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.


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