Hello all ... I finally finished building a 4th axis for my Bridgeport Series I Interact w/ Heidenhain 151B controller using an extra SEM servo motor and encoder (same as the X, Y, and Z axes). All I lack is to get the scaling correct. For instance, moving the 4th axis 90-deg (command line: G01 G90 A90) moves the rotary table, in reality, 144-deg.

I have played with a number of machine parameters but nothing seems to change scaling, including the "correction factor" parameters, MP43 specifically.

How can I adjust scaling?

Many thanks!