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Author Topic: .25 cal regulator  (Read 999 times))

Offline Treb37

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Re: .25 cal regulator
« Reply #20 on: January 14, 2021, 07:47:12 PM »
Just to be clear I missed a decimal point for the thickness of the total shim pack in my last post....it should have been .0175". I just got back from the shop AGAIN and added some more shims for a total of .04" which is just about 1mm of total shims. The bonnet starts preloading the spring at almost a full turn from being tight. I finally got up to 2K output pressure but why so many shims?

Also as a fun side note I decided to fill my junk 13ci bottle with .223 bullets to displace some volume before I keel over working that hand pump. And as a happy side note, if it blows up I've created a Vietnam era antipersonnel bomb complete with flechettes... ;D
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Offline Treb37

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Re: .25 cal regulator
« Reply #21 on: January 15, 2021, 03:13:43 PM »
New ProV2 Ninja reg showed up last night and I fiddled with it to output 2K with this configuration.
Here is the Ninja reg Belleville washer stack config ||))(())(())(( with a .045 shim on the bottle side. The ninja reg only had 11 BV washers so I had to steal one from the Taiwanese reg. The two vertical lines are red shims that came on the Ninja spool.

Since I couldn't find a 3K regulator I bought a 4500 reg and changed out the burst disks. There is no question this is a higher quality unit than the OEM reg. Now that I have a compressor on the way I'll finally be doing some shooting. The new reg is on a 22ci bottle so I'm hoping for a few more shots from a fill and a little more umph from the new reg.
« Last Edit: January 15, 2021, 03:17:10 PM by Treb37 »
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Offline Treb37

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Re: .25 cal regulator
« Reply #22 on: January 15, 2021, 04:34:45 PM »
So just to wrap up this thread, I hand pumped the new bottle up to 2.5K and did a few preliminary tests. JSB king 25.39 are moving about 935fps and and stacking on top of each other at 25yds. Also shot some NSA 26.8gr slugs running about 905fps... I'm finally a member of the 900+fps airgun club. Thanks to you guys that responded to this thread for helping me work through this process.

I had some Krylon camo spray paint laying around and decided to test it on the forearm. I think I'm gonna do the whole stock in that color. This is the bench for my basement indoor 10yd range which doubles as my sniper hide and outdoor 25yd range.
« Last Edit: January 15, 2021, 04:40:39 PM by Treb37 »
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Offline Hajimoto

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Re: .25 cal regulator
« Reply #23 on: January 15, 2021, 09:45:57 PM »
I'm glad you got where you needed to be. I have built hundreds of Ninja Pro V2 Regulators and the washer stack that have there is exactly what I use. the Bellevilles will deliver 1500PSI and I then shim 0.012 to 0.015 to hit the number I need.  Enjoy your new power! 
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Offline Hajimoto

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Re: .25 cal regulator
« Reply #24 on: January 16, 2021, 04:17:23 AM »
Haj,
The issue of spring preload is another way of altering set point.
Some regulators adjust there set point via Bevel spring preload changes, while some have bevels under a fixed preload and alter seat height.
BOTH have an effect of set point. I  did not really go in-depth on the my statement you quoted.

Said ... if each body has a differing spacing and preload on the bevel stack, that too ... along with seat gap/height effects the set point.

Hope this clears up any misunderstanding for the basic conversation we're having here  ;)
Scott - Thank you so much for taking the time to expand on your original cursory response and not blasting me ;D .
I am rather happy to read that my understanding of these things is correct because over the past couple of months the wife seems to have found more and more that I am wrong about resulting in a bit of a complex  ;)
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Offline Treb37

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Re: .25 cal regulator
« Reply #25 on: January 31, 2021, 08:39:19 PM »
So I thought we were done with this thread but it turns out not so much....After thinking I had this straightened out I started having trouble with my Ninja reg. Anyway to make a long story short, my reg test rig gauge was hoopajooped. I had forgotten I dropped it once and never thought twice about it since it hit the carpet first but it was reading between 300 and 400 psi low. When I would pump up the bottle after a shim adjustment it would get up to nearly 500psi on the pump before the test rig would show any pressure and I thought something was wrong with the reg.  ??? :o It showed up when I shot across the chrony and was getting 790 on the first shot and increasing to about 950 as the shot count increased. So the pressure on the bottle side of the valve was holding the valve shut just like it does on non regulated PCP's with a typical bell curve.
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Offline Motorhead

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Re: .25 cal regulator
« Reply #26 on: January 31, 2021, 09:15:15 PM »
AKA: Valve lock
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Offline Treb37

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Re: .25 cal regulator
« Reply #27 on: February 01, 2021, 11:50:51 PM »
Yep it looks like valve lock...what's confusing me now is why I am having the issue below 2K on the reg output.  Could it be hammer spring sag or am I missing something else?
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1st gen XS60c
Gauntlet .25