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PostPosted: Tue Feb 25, 2014 12:15 pm 
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3K output what.... :shock:

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PostPosted: Tue Feb 25, 2014 8:50 pm 
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bottle..
reg @ 2k
3k burst disk reg output


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PostPosted: Tue Feb 25, 2014 11:22 pm 
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blarg wrote:
bottle..
reg @ 2k
3k burst disk reg output


OK that makes sense now... :wink:

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PostPosted: Sat Mar 01, 2014 7:01 pm 
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I pumped tank to 2100, added output hose with gauge, pumped gun to 2k and connected...
1400psi!?
Sonofa.
Had shimmed to .024 with:
)) () () () () (( as belleville stack in .032s
I expected variation, but yeesh, I'm three times off my acceptable margin.
Might get a day tomorrow to not freeze up loading and shooting some of that down.
Motherfooey.


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PostPosted: Sat Mar 01, 2014 9:07 pm 
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The black line on my graph suggests 1700 with that setup.... Different brands of Bellevilles is my guess.... I'd add 0.020" and hope you don't send it into stack bind....

Bob

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PostPosted: Sat Mar 01, 2014 9:40 pm 
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Based solely on the 1/4" turn to snug bonnet which had resistance, there's probably room for that.
I almost added more before the first test but baby steps with HPA and not lots of stack room either.
I may risk, um, washer bind with a .048 because I'd sooner shoot down from 2200 then shoot 2200 down @ 1400, +.024=1700? We'll at least see if the .004/50psi holds true (assuming linear belleville spring force too much?)...
Even with my wastey hammer 800psi to regulated crossover is lotsa shootin in a 48ci.
Maybe a page from your book taking chrony data Bob.


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PostPosted: Mon Mar 03, 2014 1:18 pm 
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Final followup - 0.060 shims required for 2k output pressure on this reg.
Just goes to show the wide variation in tolerance Bob noted earlier.


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PostPosted: Mon Mar 03, 2014 4:01 pm 
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Most likely the particular Bellevilles you are using are different than the ones supplied by Ninja, even though they have the same dimensions.... Your curve is very similar to the one I plotted for ten 0.032" Bellevilles with a single 0.022" on each end as doublers....

Bob

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Airsonal;
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Proud Member of the 2000+fps Club!


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PostPosted: Mon Mar 03, 2014 4:08 pm 
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Not sure why editing is not possible, but one thought to add.
Original shims were 0.024 and resulted in 1.4kpsi.
Final shims were 0.060 and resulted in 2kpsi.

I did not try a mid range @ 0.48 as I said I might because I am hand pumping this bottle @ 48ci and I would sooner shoot it down at stack bind then some amount under what I was shooting for.

So I jumped to 0.060, which is 0.036 more then the 1400, or 9x50psi (projected), which *should* have dropped pressure in around 1850psi.
Since it resulted in 2kpsi on the button, I now have reason to believe that bellevilles are non-linear in spring compression, which is no shocker but now has empirical measurements in absence of a compression curve.

I may well be on the edge of stack bind, but I will take it. Bottle was @ 2.5k and gun @ 2k, so job done - for now.


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PostPosted: Mon Mar 03, 2014 7:15 pm 
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If they were linear, the lines on my graph would be straight lines....

Bob

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Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Mon Mar 03, 2014 8:24 pm 
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Point taken.
Still need more then my two data points to map fastenal .32s..
If your two cup washers were the .22s you mentioned, well mixed spring rates just adds to my confusion.
My setup started 300psi lower @ 0.20 but your cup washers were 0.020 less, but that is not flat shim but sprung shim, and never reached 2k until 0.060 where yours would have been in 2.8k range (projecting).

I do not even know if it is fair to say fastenal washers are springier because with two data points as apples compared to an orange spring mixture it remains speculation. It all falls to that compression curve I did not yet map.

It has been fun, except for the pumping part.


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PostPosted: Mon Mar 03, 2014 10:55 pm 
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Gold line was one 0.022" on each end ("thin"), black line was one 0.032" on each end ("thick") in addition to the stack of 10.... Adding a washer in parallel with the end ones acts like a shim but adds stiffness.... In effect then the middle 8 do most of the work.... but 8 in series are stiffer than 10 in series....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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