M251 Sum Extraneous Control ON

M251-(M&S) Sum Extraneous Control ON
Allows T20’s to follow Z1 but machine independently as well.
Programed Sub Feedrate is added/subtracted from Main.
T20’s Z position Zero follows Main Part Z Zero.
Sub Feed is Feed/rev of sub not Main. Use G98 in sub.
Counter rotation drilling Works using M103-M105 in sub.
Watch for OT of Z2 as it Follows Z1
Sub Spindle Programing is Z- into the Part, like T30’s
Built in wait code. Program on line by itself in main and sub.
No Z1 or Z2 Axis Rapid moves allowed??????