.22 ACP Build-A Work in progress
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.22 ACP Build-A Work in progress
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Topic: .22 ACP Build-A Work in progress (Read 1717 times))
Rob M
GTA Senior Contributor
Posts: 6308
Re: .22 ACP Build-A Work in progress
«
Reply #20 on:
December 07, 2020, 12:28:18 AM »
another idea, the 760 tube will eventially need 2 flat top setups.. ( to reach 3000 ) but for a proto , 2 stock arrangments would actually work fine for pumping to 1500 or so.. Maybe some stiffening of the piston rods with nails get you to 2200
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Louisiana
JuryRigger
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GTA Senior Contributor
Posts: 4008
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Real Name: Jesse
Re: .22 ACP Build-A Work in progress
«
Reply #21 on:
December 07, 2020, 12:43:36 AM »
3000 PSI is not a hard figure. That is the max the setup will ever see; the lower the pressure I can reach my FPE goals at the better.
Hope to get there at 2500 or so; will not know for sure until I try.
Jesse
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Ohio
"Genius errs, if possible, more badly than pedantry. But mathematics, properly directed, cannot fail"-Captain Nemo
"Numbers don't lie until they're cherry-picked statistics"-Forest Addy
"You've got to keep your ego in check!"-Paul Harrell
"If you are trained, you will do what you're trained to do-if you're untrained you'll flop around like a fish"-Paul Harrell
JuryRigger
NUAH Club Member
GTA Senior Contributor
Posts: 4008
Pop-Whiz-Clunk! :D
Real Name: Jesse
Re: .22 ACP Build-A Work in progress
«
Reply #22 on:
December 07, 2020, 02:01:19 AM »
Up front? You mean the action, correct? That will all be from scratch too, I have a good-sized chunk of bearing bronze that I will use for the valve body. 1/2" stainless rod for the poppet, have a stick of 3/8" PEEK for the poppet head. Barrel will either be a Lothar Walther blank, or more likely a sleeved .22LR liner/maybe a sleeved FX liner. Breech slide, hammer and power adjuster will all be out of other tube or rod stock. May order some aluminum rod for the barrel bushing, weight will already be up there. Scope rail and trigger group will come out of random bar stock/plate, grips will be from black walnut I salvaged from some firewood. Haven't figured out too many of the specifics on the power adjuster/hammer etc. Thinking that they will ride on the barrel, I believe that's how they do it with the Condors.
Jesse
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Ohio
"Genius errs, if possible, more badly than pedantry. But mathematics, properly directed, cannot fail"-Captain Nemo
"Numbers don't lie until they're cherry-picked statistics"-Forest Addy
"You've got to keep your ego in check!"-Paul Harrell
"If you are trained, you will do what you're trained to do-if you're untrained you'll flop around like a fish"-Paul Harrell
sb327
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Real Name: David
Re: .22 ACP Build-A Work in progress
«
Reply #23 on:
December 07, 2020, 08:56:10 AM »
They ride the inside of receiver tube around the barrel. Same difference.
If you end up with a dual pump, could you design it to drop out one pump when it got too difficult? Then just use one to boost it on up.
How long barrel you planning on using?
Dave
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USA, OK, Stigler
Dave
JuryRigger
NUAH Club Member
GTA Senior Contributor
Posts: 4008
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Real Name: Jesse
Re: .22 ACP Build-A Work in progress
«
Reply #24 on:
December 07, 2020, 08:26:37 PM »
I'm not sure about doing dual pumps in the first place; I like slim guns
. As far as barrel length; as long as possible. The action from the butt up to the rearmost full cross-section of barrel will be around 14", keeping to an OAL of 48" that gives me room for a 34" barrel, or a 28" barrel with a 6" LDC. Don't really want to go longer than 48" overall, and 28" blanks seem to be common (and cheap).
Jesse
Logged
Ohio
"Genius errs, if possible, more badly than pedantry. But mathematics, properly directed, cannot fail"-Captain Nemo
"Numbers don't lie until they're cherry-picked statistics"-Forest Addy
"You've got to keep your ego in check!"-Paul Harrell
"If you are trained, you will do what you're trained to do-if you're untrained you'll flop around like a fish"-Paul Harrell
Rob M
GTA Senior Contributor
Posts: 6308
Re: .22 ACP Build-A Work in progress
«
Reply #25 on:
December 07, 2020, 11:59:37 PM »
Dave has a good idea, youd essentially have a 2 stage pump if one could disengage..
I thought you were getting most of the parts from aliexpress and ebay and just making a frame.. Not making every single part.. thats a lot of work
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Louisiana
JuryRigger
NUAH Club Member
GTA Senior Contributor
Posts: 4008
Pop-Whiz-Clunk! :D
Real Name: Jesse
Re: .22 ACP Build-A Work in progress
«
Reply #26 on:
December 08, 2020, 01:33:54 AM »
Haha-I didn't choose the username JuryRigger for nothing....
Hopeless gotta make it myself lunatic is what I am...(with a healthy dose of penny-pincher thrown in)
The thought of a 2 stage pump is most interesting, if you kept each pump cycle running in a 1-2 fashion, you could gain some efficiency in a sense... Would be even better if you used a larger bore pump for the "first" stage to feed the second precompressed air at an even higher ratio.... Food for thought, will sleep on it.
Jesse
«
Last Edit: December 08, 2020, 01:41:25 AM by JuryRigger
»
Logged
Ohio
"Genius errs, if possible, more badly than pedantry. But mathematics, properly directed, cannot fail"-Captain Nemo
"Numbers don't lie until they're cherry-picked statistics"-Forest Addy
"You've got to keep your ego in check!"-Paul Harrell
"If you are trained, you will do what you're trained to do-if you're untrained you'll flop around like a fish"-Paul Harrell
sb327
Expert
Posts: 1790
yes
Real Name: David
Re: .22 ACP Build-A Work in progress
«
Reply #27 on:
December 08, 2020, 08:45:33 AM »
Maybe you could keep it slim. Run small stage inside large ram. Lock rams together till pressure gets high. Lock large ram to cylinder, unlock small ram to boost. Small ram only needs connection to arm. In stowed position, both locks on.
Just spitballing....carry on
Dave
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USA, OK, Stigler
Dave
JuryRigger
NUAH Club Member
GTA Senior Contributor
Posts: 4008
Pop-Whiz-Clunk! :D
Real Name: Jesse
Re: .22 ACP Build-A Work in progress
«
Reply #28 on:
December 08, 2020, 10:47:39 AM »
At one point, I was debating a coaxial 2-stage pump that resembled my second pump design, the difference being the piston rod would be slightly smaller in diameter relative to the pump bore. First stage compression would be accomplished with closing the pump, the air from the full bore area being forced into the smaller volume around the piston rod. Final compression would be from pulling the piston rod outwards, the pump outlet would be by the end of the cylinder.
Think I will stick with simple designs, I already have my work cut out for me.
Jesse
Logged
Ohio
"Genius errs, if possible, more badly than pedantry. But mathematics, properly directed, cannot fail"-Captain Nemo
"Numbers don't lie until they're cherry-picked statistics"-Forest Addy
"You've got to keep your ego in check!"-Paul Harrell
"If you are trained, you will do what you're trained to do-if you're untrained you'll flop around like a fish"-Paul Harrell
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All Springer/NP/PCP Air Gun Discussion General
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Engineering- Research & Development
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.22 ACP Build-A Work in progress