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Pump Shaft Usable?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: clemsonguy1125 » Thu Jun 17, 2010 1:06 pm

Gun Freak wrote:Or do as deathbyDWV suggested to me, use a brass nipple... they're smooth on the inside and threaded....

That would work but would be extremly expensive a 3/4 by 5 inch brass nipple is 7.95 so for a 18 inch one you would be paying big bucks
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Unread postAuthor: saefroch » Thu Jun 17, 2010 2:18 pm

... and I paid $27 for a stainless steel pump shaft. It's really not that much money when you consider that what you're buying you will probably never replace.
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Unread postAuthor: c11man » Thu Jun 17, 2010 2:25 pm

why stainless? alluminum would work just as good
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Unread postAuthor: saefroch » Thu Jun 17, 2010 2:26 pm

Aluminium is softer... MUCH softer. You wouldn't believe how easy it is to hack that stuff up. Also, on McMaster, the stainless is actually cheaper than brass or aluminium. But aluminium and brass are VERY soft. I've taken chunks out of aluminium and brass parts with my vice, only scratches with steel parts.
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Unread postAuthor: spudtyrrant » Thu Jun 17, 2010 3:37 pm

saefroch wrote:Aluminium is softer... MUCH softer. You wouldn't believe how easy it is to hack that stuff up. Also, on McMaster, the stainless is actually cheaper than brass or aluminium. But aluminium and brass are VERY soft. I've taken chunks out of aluminium and brass parts with my vice, only scratches with steel parts.
well it really depends on the temper and make-up of the metals, jack hogg used his aluminum piston to more than 35 bar with no bumper, and it wasn't damaged at all
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Unread postAuthor: Mpeddlesden » Fri Jun 18, 2010 12:46 am

copper pipe here is none reliable with limited attachment's and more work the galvanized pipe seems better that the only work it needs is to drill out the inner weld.
the one way valve will be the only real work needed. :) :) :)
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