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Old January 12, 2019, 07:19 AM   #37
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Join Date: November 22, 2006
Posts: 3,023
Too bad the definition of “cam over” has been corrupted by so many, including the author of the article in the OP. As a result, threads like this become a source of considerable confusion and misinformation.
Cam-over in torque wrenches are pretty much like pushing a weight over a peak then when you force is at its zenith it goes over the peak and input force drops.

It’s not an uncommon concept lots of things use the cam overcenter concept.

In a press the idea is a little more handle travel would get you to the same ram/die position (minus stretch & linkage takeup) vs a positive stop where the operator might not hit the stop.

From the OP’s link.

Here’s camming linkage and its effect. On left is the maximum height attained by the ram; on right is the ram position at the full-limit stop on the press handle. It’s 0.020 inches on this press.
That is cam-over and as the press was designed the only way to not cam-over is to not make a full stroke. You can run it empty or run a die down and put it in a bind but both will still cam over if you can complete a full stroke.
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