It don't have to be pretty. It just has to work right? And total cost is $0 as everything was scrap or found parts.
Pretty sure that has been talked about somewhere.Bob or Lloyd could give you the exact math on all that.Mostly when they do? I get a head ache as it's WAY above this balding head.
I tend to do that...I knew that the spring added mass to the equation, but I also know that they do not release their forceat a constant rate, bit rather oscillate during rapid extension...... 'Anyway, I'm gonna purchase the longer Vortek spring and go from there....Recommendations on amount of preload??
Quote from: HectorMedina on September 23, 2022, 12:41:06 PMRemember when you have the liberty to choose the spring ALWAYS choose the largest OD you can fit into the piston. While it is true that springs expand upon compression, it is rare that a spring expands by more than 0.015".AND, unless you know that the spring is made of valve spring steel (usually Si-Va), it is not worth the effort.HTH, keep us posted!HMShould the sleeve be eliminated?The sleeve had an ID of about .81" IIRC.......What is the purpose of the sleeve?
Remember when you have the liberty to choose the spring ALWAYS choose the largest OD you can fit into the piston. While it is true that springs expand upon compression, it is rare that a spring expands by more than 0.015".AND, unless you know that the spring is made of valve spring steel (usually Si-Va), it is not worth the effort.HTH, keep us posted!HM
Thank you, Mr. Hector.FWIW, once I understood the sear location, I measured the stroke at 5"There is 1/4" of preload. So, the gas ram stroke length of 5 3/8" is pretty doggone close....I have ordered a Vortek 840142-41 spring..840" OD, .142" wire diameter 41 coils closed,ground and polished at 14" OAL.This is to replace the gas ram that was 13" OAL but have to give up 1" at the end plug as the tube that projects 1" forward is too small to accommodatethe spring ,721" ID, .858" ODI will make a spring guide to fit into the end plug, then extend forward.Maybe a tophat for the front inside the piston ??The sleeve is actually .845" ID, but too tight for the spring. I will use plastic of appropriate thickness, maybe about .030" ??The sleeve wall thickness is .018"I believe this spring has a rate in the 48# range, so 2 1/2" or preload will be about 120#, and cocked force of about 360...That may me too much....dunno
Quote from: Ronno6 on September 26, 2022, 06:57:12 PMThank you, Mr. Hector.FWIW, once I understood the sear location, I measured the stroke at 5"There is 1/4" of preload. So, the gas ram stroke length of 5 3/8" is pretty doggone close....I have ordered a Vortek 840142-41 spring..840" OD, .142" wire diameter 41 coils closed,ground and polished at 14" OAL.This is to replace the gas ram that was 13" OAL but have to give up 1" at the end plug as the tube that projects 1" forward is too small to accommodatethe spring ,721" ID, .858" ODI will make a spring guide to fit into the end plug, then extend forward.Maybe a tophat for the front inside the piston ??The sleeve is actually .845" ID, but too tight for the spring. I will use plastic of appropriate thickness, maybe about .030" ??The sleeve wall thickness is .018"I believe this spring has a rate in the 48# range, so 2 1/2" or preload will be about 120#, and cocked force of about 360...That may me too much....dunnoLots of questions about the choice, but, we'll see what happens.Keep us posted not only on the initial results, but also about what happens at shot #1,000; 2,000; 3,000; etc.HM