HEIDENHAIN SW 688945-03 - Manual (Page 7)

HEIDENHAIN CNC PILOT 620/640 7
 The spindle synchronization option G720 synchronizes the shaft
speeds of two or more spindles so that they rotate synchronously
with a gear ratio or a defined offset (see the smart.Turn and ISO
Programming User’s Manual)
 In combination with the synchronization (G720) of main spindle and
tool spindle, the new "Hobbing" cycle (G808) is available for milling
external teeth and profiles (see the smart.Turn and ISO
Programming User’s Manual)
 With G924, a "fluctuating speed" can now be programmed to
prevent resonance (see the smart.Turn and ISO Programming
User’s Manual)