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My first Stirrup Pump build...

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 » Sat Feb 27, 2010 5:34 pm

Big-E wrote:I used a 3/4" machine screw anchor, it's a two piece steel fitting that is crushed together when you a machine screw in it, and it presses into whatever the screw is going into. I sealed it up with JB Weld Epoxy, and threaded it onto my rod. once cured, I used a dremel, a couple of files, and sandpaper to make the grooves for the o-ring and air relief notches.

The o-rings I used were:

5/8" I.D. (13/16" O.D.) x 3/32" wall for the piston
1/4" I.D. (3/8" O.D.) x 1/16" wall for the check valve.

I used thicker, L Rated 3/4" tubing for the pump body.

I think I may cast my piston entirely from epoxy and for the grooves what bit did you use
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Unread postAuthor: Big-E » Sat Feb 27, 2010 5:39 pm

Cutoff wheel on the dremel, I used the steel in the piston to help guide the tool on the o-ring groove, as even cured JB Weld is easier to cut than steel.

If I have time, I'll snap a pic of the machine screw anchor, I bought two of them.
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Unread postAuthor: clemsonguy1125 » Sat Feb 27, 2010 5:49 pm

Ok thanks that will help a lot
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Unread postAuthor: LovableAirGuns » Mon Apr 18, 2011 9:02 am

WOW :O what a nice pump, great work.
Iv nearly finished mine, hope mine works just as good as yours.
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Unread postAuthor: Big-E » Mon Apr 18, 2011 9:37 am

Wow, now that's kicking up an old thread, LoL!

I hope your pump works well too. Be sure to post some info on it when it's all together. :)

I have made some changes to my pump recently; For one thing, I don't use a schraeder chuck anymore; it's been replaced by a male quick-connect fitting. I also reworked the check valve a bit to fix some issues (it stuck open around 300 PSI once) and reduced the dead space at the bottom some more.

Oh, and I have a stand for it now, and added a bit to clip the air hose to when not in use. Maybe I'll post some pics later. I also updated thunderbess a bit too. Updates all around perhaps?

I was thinking of making another pump with a 1/2" pump body instead of a 3/4" one in the near future as well. When I get around to it I suppose.
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Unread postAuthor: LovableAirGuns » Mon Apr 18, 2011 9:23 pm

Update pictures sounds good and hopefully i can post pics of my pump today even though my pump has so much dead space that i need to get rid of :/
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