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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Paul Lulai
Sent: Monday, March 14, 2011 4:37 PM
To: Forum for Physics Educators
Subject: [Phys-l] Torque and wrenches
Hi.
I've got a lack of understanding regarding torque wrenches.
My understanding is that torque is the product of the force and radial
distance of the force.
Torque wrenches will stop turning / start ratcheting when the torque is
higher than the settings on the wrench.
My question is, at what radius does the torque wrench measure the
torque?
Is the radius that of the bolt head?[Bill Nettles] To calculate the force on the bolt head.
If the radius is that of the bolt head, would simply changing the head[Bill Nettles] The rotational torque is the same at all points on the wrench. What you are actually doing that is important regarding bolt dimensions is creating a mechanical advantage swapping distance for force.
of a torque wrench (and the bolt you are using) affect the actual
tightness of a bolt?
Paul Lulai
Physics Teacher
St Anthony Village S.H.
3303 33rd Ave NE
St Anthony Village, MN 55418
612-706-1146
plulai@stanthony.k12.mn.us
http://www.stanthony.k12.mn.us/hsscience/
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