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hollow punches to make pistons

A place to ask general spud cannon related questions.
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hollow punches to make pistons

Unread postAuthor: jackssmirkingrevenge » Thu Apr 12, 2012 3:04 pm

I often advocate the use of solid rubber pistons for coaxials punched out of thick rubber sheet using a sharpened section of chamber tubing. Turns out there are tools specifically made for the job:

Image

Metric and imperial sets with most common diameters are available online for not much, some examples:

http://www.ebay.com/itm/Stainless-Steel ... 43ae8465cf

http://www.ebay.com/itm/NEW-6PC-LARGE-S ... 3ca69180bb

http://www.ebay.com/itm/12pc-Hollow-Met ... 27c4d00b61

These would be especially useful to those making penguns or similar small caliber pneumatics but are struggling with the piston element.
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Last edited by jackssmirkingrevenge on Thu Apr 12, 2012 3:08 pm, edited 1 time in total.
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Unread postAuthor: wyz2285 » Thu Apr 12, 2012 3:08 pm

Cool, but now that I can make solid nylon pistons... :lol:
If you found out earlier, I probably have bought one.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 12, 2012 3:25 pm

Apart from pistons these would be useful to make sabots too, I'm sure you could cut through thin plywood for example.
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Unread postAuthor: warhead052 » Thu Apr 12, 2012 6:39 pm

I had actually looked at that not long ago, planning on getting some at some point so I can make small pistons.
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Unread postAuthor: Crna Legija » Fri Apr 13, 2012 1:50 am

I have a set that also marks the center of the circle perfect for making sealing faces and gaskets for bolt/washer pistons, it wasn't cheap $200 that's 10-60mm in 5mm increments
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Unread postAuthor: Zeus » Fri Apr 13, 2012 4:21 am

Personally, I wouldn't run out and buy these, they might not fit the barrel as tightly as a piston cut with the housing material.

Excellent idea though, and it'll be ideal for sabots.
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/sarcasm, /hyperbole
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Unread postAuthor: Brian the brain » Fri Apr 13, 2012 12:43 pm

Ehmm..

This is new to you?

I have a complete metric set of them... :D
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 14, 2012 3:51 am

Brian the brain wrote:This is new to you?


:oops:

I spotted a set in the maintenance room at work, had never seen them before. I have a set of home made sharpened tubes so never felt the need to seek a "proper" alternative...
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Unread postAuthor: Petitlu » Sat Apr 14, 2012 4:20 am

I also, including a number of 20mm for cutting rupture discs
:D
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Unread postAuthor: Brian the brain » Sat Apr 14, 2012 4:48 am

I have a complete metric set of them...

But this is still true:

they might not fit the barrel as tightly as a piston cut with the housing material.


then again; a set of these will come in handy.
I've used them on several occasions, for spudding and cutting engine gaskets alike.


The set I have allows for coaxial use of two at the same time, cutting perfect washers as a result.

The seal for the counterbalanced valve was made by cutting a ring out of some thick teflon sheet.

So yeah.. I can recommend them.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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