I overspoke when I said "constant" - like everything, involute shape is a compromise, in this case (I think) between constant torque and manufacturability. I s

I overspoke when I said "constant" - like everything, involute shape is a compromise, in this case (I think) between constant torque and manufacturability. I should have said "the shape is intended to minimize torque transmission ripple". I'll pull out my old textbook and see if I can figure out where I picked that up from.