Jeff and All,

In Mach Mill, Settings (Alt-6) Tab you will see Rotation Radius for the A/B/C axis.

Look in the Mach2MIll_6.11 Manual, 6.2.12 and you will find a very brief explaination and here it is:

" As described in the Feedrate control family, it is possible to define the approximate size of a rotated workpiece so the rotational axis speed can be correctly included in the blended feedrate. The relavent diameters are entered in the DROs of this family"

Anybody want to provide a simple explaination?

My guess on this:

If the A axis was linear and had the same steps per units along with velocity and accel as the other axis then a point along / around a circumference would be linear sych'd with the other axis exactly for only one specific diameter.

If the A axis was linear and didn't have the same steps per units then the above would no longer be true

for a given feedrate.

So by inputting the diameter that will be cut , Mach modifies the feedrate such that the linear moves will be

"APPROXIMATELY" snch'd for a commanded feedrate.

What formula is used for calculating the combined inch/degree feedrate( blended feed rate) ?

Does Mach read the diameter in the program and adjust the feedrate for a different diameter and adjust accordingly?

Based on what diameter....ie; define linear steps per unit based on a diameter of 1 in motor tuning?

RICH

BTW,you will not find those DRO's a modified lathe screen....Yet!