Centroid Community CNC Support Forum

Dave_C wrote: ↑Mon Jun 21, 2021 11:40 am Marty,

Here is my old video with some info on what I changed, at least I think it is there!

https://youtu.be/772VcHhFSV0

Dave C.

Thanks again Dave.
Your video shows the control rigid tapping 5 full depth holes.
Seems my buddie's control can do this. Where it is having trouble is peck tapping a hole. More than 2 pecks.
Marty

The more pecks you do, the shallower the first peck is.

E.g. if you tap a 1/2" deep hole in two pecks, the first one goes from +0.100" to -0.250". If you tap the same hole in five pecks, the first one goes from +0.100" to -0.100".

Chances are, you have the parameters characterizing spindle deceleration (P37, P68, P69 and P82) set so CNC12 expects that the Z distance traveled while decelerating to a stop will exceed the total Z distance in the first peck.