Convert PSI to CUP

[suntiet]

Any one have a formula or whatever to convert cup to psi and back? I know the difference I just want to know if there is a close enough way to go about it?
Thanks

 

[RON in PA]

I believe there is no easy conversion, I have never seen a formula that would enable one to do this.

 

[steveno]

there isn't any formula to convert cup to psi. the cup and psi numbers came from testing in the lab. I seen a chart once that compared the numbers for different rounds in either "Handloader" or "Rifle" magazine.

 

[Rabid Rabbit]

Ditto here. Every reloading book I've read says there is no conversion method that will work. I've noticed a couple companies still lists pressure as CUP instead of PSI, although they are measuring PSI.

 

[mete]

There is no direct conversion ,in addition the european method of determining psi is different than ours.

 

[lonniemike]

CUP to PSI

Yes, there is ANSI/SAAMI PSI = -17,902 + 1.51 x ANSI/SAAMI CUP There have been several discussions at the AccurateReloading.com, -Forums-Reloading- section. All of them have been good reading. The latest is several pages back from the top page under the header of 'CUP and PSI'. The last posting date was 2/15/05 on page 11 at the bottom. It'll go to page 12 soon. Something to remember is that there is considerable error in either system. And it is kind of like comparing apples to oranges in that CUP(copper deformation) tends to measure a peak pressure over a longer interval of time(in millisecs) than PSI(piezo/oscilloscope) which measures pressure in shorter time intervals(in microsecs). Now to the ANSI/SAAMI mix of measures add in the Home (strain) measures like from Oehler's M-43 or the PressureTrace system and we have plenty to try to figure out and talk about. Best-o-Luck

 

[suntiet]

Thanks just wanted to get close for that dos program someone else listed on the Cumpeter crashed thread. Am trying to figure data for a %0 Beowulf, not much out there.
Thanks again