Torsion Spring Calculation?
Torsion Spring Calculation?
(OP)
I am trying to calculate what size torsion spring I need to move a 40 lb load. If you look at the following link you can see the application.
http://mysite.verizon.net/tabarr/images/springquote.jpg
I have used the Eng Edge calculator but am not sure if I used it correctly. I have 35 degrees to push using a 180 degree torsion spring. The cutting head weighs 40 lb. The moment is 2". This gives me a spring constant of 2.2857 (lb-in/deg) "K".
Is this "K" value equal to the "torque in/lb" found in a spring catalogue? If not, how do I equate this "K" value to that torque rating.
Thanks in advance,
Todd
http://mysite.verizon.net/tabarr/images/springquote.jpg
I have used the Eng Edge calculator but am not sure if I used it correctly. I have 35 degrees to push using a 180 degree torsion spring. The cutting head weighs 40 lb. The moment is 2". This gives me a spring constant of 2.2857 (lb-in/deg) "K".
Is this "K" value equal to the "torque in/lb" found in a spring catalogue? If not, how do I equate this "K" value to that torque rating.
Thanks in advance,
Todd





RE: Torsion Spring Calculation?
However, usually a spring designed for 35 degrees deflection during work is preloaded to some torque before it goes the 35 degrees. Is your spring preloaded or the torque changes between zero to 80 lbf-in during the 35 degrees deflection?
Added to other many factors when you select/calculate a torsion spring you have to take into account how many times it will have to endure the 80 lb-inch torque (fatigue analysis).
http://www.webspawner.com/users/israelkk/
RE: Torsion Spring Calculation?
http://www.webspawner.com/users/israelkk/
RE: Torsion Spring Calculation?
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Any response is greatly appreciated.
Todd
RE: Torsion Spring Calculation?
Pay attention that the 42.86 lb-in springs (p/n 9287k105 for example) are more than 1.1" outside diameter and approximately 1.5" long. So your spring will be even larger.
http://www.webspawner.com/users/israelkk/
RE: Torsion Spring Calculation?
Tony R