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Old 07-20-2012, 10:44 AM #1
russc
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Pump Shoebox Build

I'll be entering the MCB "pile of poo" buildoff with an old broken Shoebox shocker. I think I can turn it into a pump for under $100.



Basically I'll be replacing the firing noid with a 2 or 3 way valve. I'll ditch the bolt noid and manually control the bolt with a backblock, and have a cocking rod thread into the dump chamber valve to open it and "cock" the gun. Meaning, it can't shoot at all without being pumped, not even dry firing.
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Old 07-20-2012, 11:26 AM #2
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Ha nice, those solenoids are expensive. You'll certainly have the biggest pump gun at he field.
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Old 07-20-2012, 12:07 PM #3
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Fantastic plan sir! Where did you get that visual representation of the marker mechanics?
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Old 07-20-2012, 12:11 PM #4
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zdspb.com, it's a great site run by ydna. Lots of marker animations, and a ton of technical info on Smart Parts guns.
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Old 07-20-2012, 12:32 PM #5
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Quote:
Originally Posted by russc View Post
zdspb.com, it's a great site run by ydna. Lots of marker animations, and a ton of technical info on Smart Parts guns.
Excellent thank you!
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Old 07-20-2012, 03:57 PM #6
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This seems well thought out. I was thinking it would be much less professional. I'm actually interested to see the finished product.
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Old 07-22-2012, 11:02 AM #7
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I have to think back... some where a friend of mine did a pump PVi Shockers. he did it electronically, with two boards that ran either part of the gun and two trigger switches.
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Old 07-22-2012, 12:19 PM #8
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Old 07-22-2012, 09:22 PM #9
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You can actually remove the rod and fire the gun, I have done this just to see what would happen.

It uses an ungodly amount of air. I had a N2O tank on it for the test and it dropped approximately 50psi on the tank per shot. Very inefficient and you may have to shake the gun forward to get the valve to seal again.

I like your idea and I look forward to seeing what becomes of this hunk of aluminum.
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Old 07-22-2012, 09:22 PM #10
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Instead of a back block couldn't you rig a three way to the pump arm? Much like a pheumatic assisted pump cocker? Then have your two way running the dump.chamber?
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Old 07-23-2012, 12:07 AM #11
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Quote:
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Instead of a back block couldn't you rig a three way to the pump arm? Much like a pheumatic assisted pump cocker? Then have your two way running the dump.chamber?
Yeah I could, and I was actually thinking about doing it that way, but I kind of feel like a backblock system is a bit more of a traditional solution. Full pump as opposed to pneumatic assist, right?

I think I can actually keep most of the stock bolt by drilling through the back cap and using a longer rod to replace the ram.
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Last edited by russc : 07-23-2012 at 12:23 AM.
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