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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 02, 2011 3:24 pm

jrrdw wrote:All tools found in the epoxycave are uni-measurable!


Ironically, I measure everything in feet :D
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Unread postAuthor: dewey-1 » Sun Oct 02, 2011 3:27 pm

What about the depth of 6mm hole?

JSR; bare feet or socked feet? :)
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 02, 2011 3:30 pm

dewey-1 wrote:What about the depth of 6mm hole?


I'm guessing that's just to compensate for the beaded epoxy so not that critical.

bare feet or socked feet? :)


Depends on the season ;)
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Unread postAuthor: Gun Freak » Sun Oct 02, 2011 4:12 pm

I'm guessing that's just to compensate for the beaded epoxy so not that critical.

This man.... Is a genius.
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Unread postAuthor: warhead052 » Tue Oct 04, 2011 2:29 pm

Can I get a estimate for the price on this. I need it .750" by 3" long. The back part has to stop the shell from going all the way through the pipe, so if you have a piece of sch 40 3/4" pvc, make sure it won't go all the way through.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 04, 2011 2:42 pm

If the grey parts could be pre-existing pipe, the rest could be machined relatively cheaply and the whole thing epoxied together.
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Unread postAuthor: warhead052 » Tue Oct 04, 2011 2:46 pm

This is for my shotgun project, so I need it to be safe to put pressure in, and not have to weaken pvc. I am going to try a version like that, but I would like to know if it can be made?
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 04, 2011 2:50 pm

warhead052 wrote:I would like to know if it can be made?


Anything can be made. I'm just suggesting you look for a way to make it easily and quickly with the minimum of machining, so that you can have it cheaply :) remember, materials are cheap, time costs much more.
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Last edited by jackssmirkingrevenge on Tue Oct 04, 2011 2:51 pm, edited 1 time in total.
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Unread postAuthor: warhead052 » Tue Oct 04, 2011 2:51 pm

Ok, well any tips on what I should use that will fit in 3/4" pipe?
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 04, 2011 2:52 pm

warhead052 wrote:Ok, well any tips on what I should use that will fit in 3/4" pipe?


A 12 gram CO<sub>2</sub> capsule fits perfectly.

How many of these are you planning on purchasing?

Also, what's the calibre of the inner pipe?

What pressure do you need it to hold safely?

Mad Bull SS6 cartridges cost $13 each. I doubt anyone will machine, assemble, test and sell you a cart for less.
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Unread postAuthor: warhead052 » Tue Oct 04, 2011 3:01 pm

I need it to safely hold 200psi, the caliber would be 1/8" ID pex tubing (fits airsoft bb's like a tightbore barrel). As for how many, it would depend on how much it would cost to buy.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 04, 2011 3:07 pm

Using delrin/acetal parts, I would say $30 each assembled including schrader. Brass/steel/aluminium parts significantly more. I would consider the commercial item I linked to above before thinking about having them custom made.
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Unread postAuthor: warhead052 » Tue Oct 04, 2011 3:11 pm

Ok. Well I suppose its time to go back to the drawing board...
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 08, 2011 6:52 am

A little something I'm making for jakethebeast in exchange for his lovely little blade, I like <s>trucking</s> milling :D
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Unread postAuthor: Gun Freak » Sat Oct 08, 2011 3:56 pm

What is it going to be?
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