Question on Torsion Spring

[domosapien18]

Hello, I am trying to redesign the torsion spring in a drill press. I found out that to calculate the torque delivered by the torsion spring there is a variable called 'angular deflection in revolutions'.

Can someone please clarify what that variable means and how it is measured?

 

[israelkk]

One revolution is 360 degrees or 2*PI radians. Therefore, if for example you design the spring for an angular deflection of 270 degrees then in the formula you put 0.75 revolution.

 

[domosapien18]

Thanks israelkk for the quick reply. But what exactly is angular deflection in the context of a torsion spring? Because from the way I understand how a torsion spring works, is that when a torque is applied on one end of the spring the whole thing coils itself closer to the arbor (center) where it is being supported. How then is this 'deflection angle' related to that? I know that might sound like a dumb question - if you were to represent it in a diagram where would that angle theta be?

Cheers,
Dom

 

[israelkk]

Look at page 4 of the document. You will see how theta is defined (you put only page 1 of the document). Theta is the angle deflection of the spring arm from free position. In the formulas T = theta.