HEIDENHAIN MANUALPLUS 620 User Manual page 163

FZ Approach rate (infeed rate)
E Reduced feed rate
R Approach radius
WB Plunging length
EW Plunging angle
U Overlap factor (default: 0.5)
RB Return plane (diameter value)
Further forms: see page 46
HEIDENHAIN MANUALplus 620 163