compression spring torque calculation
compression spring torque calculation
(OP)
Ok so I can design a spring in solidworks and add a force to one side of the spring and measure deflection. A similar setup can be found here...
http:/ /www.xbitl abs.com/ar ticles/coo lers/displ ay/thermal right-true -copper-u1 20x_5.html
I guess my question is, how do I determine the torque needed to compress the spring a given distance? Another possibly related question is how could I tell the force that each mounting point exerts on the mother board?
http:/
I guess my question is, how do I determine the torque needed to compress the spring a given distance? Another possibly related question is how could I tell the force that each mounting point exerts on the mother board?





RE: compression spring torque calculation
I will assume the torque you are seeking is that of the screw to compress the spring some amount. Is that correct?
Ted
RE: compression spring torque calculation
RE: compression spring torque calculation
It is not "the torque of the screw that compresses the spring." The fact is that with that particular spring you probably would have trouble measuring torque or torque change before the spring went solid or buckled. To compress the spring a certain distance, what you really want to know is the lead angle of the thread of the screw, in effect, the amount the screw advances per revolution.
RE: compression spring torque calculation
http://www.engineersedge.com/torque.htm
Knowing the spring rate, lb/in, and the spring deflection you can calculate the spring force = screw tension
The torque will be small.
As implied by dhengr, you may get better results by compressing the spring to a desired length to achieve the desired spring force rather than trying to control screw torque.
Ted
RE: compression spring torque calculation
Firstly as others have said you need to design the spring and thats important for two reasons:-
1/ you can get your springrate and hence force at deflection
2/ You can also calculate the stress in the spring for
a given deflecton and avoid the spring being overstressed
and taken a permanent set.
Whilst you may not notice that the spring is over stressed it will lose pre-load and your relationship between bolt torque and spring force won't be reliable.
Once your spring is sorted yu can use the formula given in hydtools link above.
For formula on spring design see this site:-
http://ww
desertfox
RE: compression spring torque calculation
RE: compression spring torque calculation
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RE: compression spring torque calculation
Given the Spring geometry, you can compute the load required to bring that spring into solid height. From that load, you can find the torque by noting the screw geometry. So essentially the torque is that load required to bring the spring to solid height times half the major screw diameter.
Pretty much this is it. By the way, I recently did this dynamically using SolidWorks and Motion. Pretty cool.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada