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Old 03-23-2018, 08:47 AM
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Thanks, I get it . I always thought of a "back up ring" as a radial split ring kind of thing that fit the ID/inside the "O" ring to tighten it in the bore.(used when I cut the groove too deep, LOL)

Thanks, Paul
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  #42  
Old 03-23-2018, 11:25 AM
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https://ncalculators.com/area-volume...calculator.htm

This will tell you the diameter/radius of the piton needed for a direct read on the gauge or what ever multiple you want. For example a radius of .564 gives you a .9997 square inch piston. That should give you a close direct read on a gauge.
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  #43  
Old 03-28-2019, 08:09 PM
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Red did you ever get this done?
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  #44  
Old 03-28-2019, 11:09 PM
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By the way, a brake wheel cylinder cup would make a good high pressure seal.
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  #45  
Old 03-29-2019, 07:30 AM
Lew Hartswick Lew Hartswick is offline
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Oh yea and this having to open up the pressure cyl. to see the dia is silly. Just measure the pressure for a KNOWN weight on it and (what is that expression,? "Bob's your Uncle") :-)
...lew...
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  #46  
Old 07-12-2019, 10:07 AM
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OK guys, I gotta fess up, I'm deep in procrastination mode.
I'm cold trailing a piece of 3 or 4 inch brass or bronze stock. (I made the original when I was working for uncle sugar, and stock was free, LOL)

A foot of big stuff and a foot of 1 1/4 or 1 1/2 stock for the plunger would likely yield 3 or 4 scales, with about 3 hours machine time.

My little crapsman lathe just will not hold tollerence and the owner of the Hardinge tool room lathe I was using for most of my gun work has passed on, wife is not interested in selling any of his stuff yet. So here I sit. (I haven't yet found a job shop I trust to do the gun/barrel work)

Anybody want to get in the game?

RED
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A 160 MPH drive, down a 2 lane blacktop, all by yourself, is NOT anti-social behaviour... I drag race because football, baseball, and golf only need ONE ball. Paul.


What I really need to know is, WHEN DOES THE SHOOTING START?
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  #47  
Old 08-14-2019, 07:09 PM
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https://www.parker.com/Literature/O-...ORD%205700.pdf

Everyone that messes with making stuff with o-rings needs one of these. Go to page 136 and start reading. For this application, you could probably use a static design also. If you are being all professional use a nylon wear ring in another groove towards the top for ram stability.
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