[routalot]

If we are talking about steppers, any overshoot you see must be purely mechanical (inertia of the axis). The motion planner does decelerate, but it has no way to know how much deceleration is "enough" - you have to tell it (in the controller settings) what rate to use.

Anyway, you don't normally rapid all the way to the part. I don't think that would end well even if you had a perfectly tuned machine.

I think this is the root of the problem.The steppers may not generate enough torque to overcome the inertia-aided by gravity.If slower speeds give more accurate and repeatable location it narrows things down a lot.The concern I have is that the new tramming tool will be heavy enough to adversely influence the outcome.Which is why I would locate a dial gauge on the table to verify the position.