TwoGuns wrote:

I recently found a set of metal gears that will fit my Mini-Mill. I
know the standard plastic gears will strip out if the Mill tooling is
pushed too far ( which I did once). I would like to put a shear pin in
the drive system and I wonder if any of you have done it? What kind of
shear pressure would be best?

Look at your gear train, cross section of pin should be less than the gear teeth or any
other driving component. Diameter of the items connected by the pin has an effect.

It is one of those TLAR things if you can't do the calcs.

I'd go weak and work up. Grooves as mentioned fine tune things.

Wes

TLAR, That looks about right.