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thoughtful
02-06-2004, 06:32 PM
We wanted to order some cyclinders and we have this form from SMC canada where we can order 4 cylinders. They give u the boe size and the stroke size, now i understand the cylinder is about 1-2 inches more than the stroke size. Can anyone tell me about how long will be cylinders with 4",5",6" and 7" of stroke sizes.
Also a bigger bore size can make your compressor run more, but our use of pnemuatics is going to be pretty limited so is it better to have 2 cylinders of 3/4 bore than one of 2", we want to go against a compressed spring.

tbmantia
02-06-2004, 06:44 PM
We wanted to order some cyclinders and we have this form from SMC canada where we can order 4 cylinders. They give u the boe size and the stroke size, now i understand the cylinder is about 1-2 inches more than the stroke size. Can anyone tell me about how long will be cylinders with 4",5",6" and 7" of stroke sizes.
Also a bigger bore size can make your compressor run more, but our use of pnemuatics is going to be pretty limited so is it better to have 2 cylinders of 3/4 bore than one of 2", we want to go against a compressed spring.

http://www2.usfirst.org/2004comp/2004_FIRST_Pneumatics_Manual.pdf

Check here on pages 9-11

KenWittlief
02-06-2004, 07:52 PM
the force the cylinder will produce is equal to the pressure in the line times Pi times half the diameter squared

the retract force is a little less due to the presence of the shaft on that side.

maxgebhardt
02-06-2004, 10:21 PM
We wanted to order some cyclinders and we have this form from SMC canada where we can order 4 cylinders. They give u the boe size and the stroke size, now i understand the cylinder is about 1-2 inches more than the stroke size. Can anyone tell me about how long will be cylinders with 4",5",6" and 7" of stroke sizes.
Also a bigger bore size can make your compressor run more, but our use of pnemuatics is going to be pretty limited so is it better to have 2 cylinders of 3/4 bore than one of 2", we want to go against a compressed spring.
you say your pneumaics use is going to be limited, just something to consider:
if you are just going to use it to grab the bar go for the 2" bore, because the compressor cant run after the match ends, so you wont waste power. also if you are using it sparingly, you could add more pneumatic tubing between the two tanks to boost storage space. I belive they had a formula to determine the length of a cylender based on bore and stroke, and at the pneumatics workshop they said that formula as well as the pneumatics workshop powerpoint would be on the first web site. now you say your pushing a compressed spring, so I'd like to remind you to ensure there are no latteral forces. think about when you compress a clicky pen spring in your fingers, how sometimes it shoots out sideways. well that cant happen, you'll bend the cylender and render it useless. just a friendly reminder