
PROGRAMMING
B–63534EN/02
20. AXIS CONTROL FUNCTIONS
559
A gear can be shaped (grind/cut) by the synchronization of the workpiece
axis rotation to the tool axis (grinding axis /hob) rotation by using two
spindles as a tool axis and a workpiece axis. To synchronize these two
axes, the Electronic gear box (EGB) is used.
In the Spindle EGB, the synchronous pulse is produced from the feedback
pulse of the position detector attached to the tool axis (master axis) in the
motor control, and the workpiece axis (slave axis) rotates with the pulse.
Feedback pulse from Master side to Slave side is forwarded by the
communication between spindle amplifiers.
The specifications of the Spindle EGB control are as follows:
1) The Spindle EGB synchronization is started by specifying T
command (number of teeth) and L command (number of hob threads),
which determine the synchronous ratio, in G81 block. The Spindle
EGB synchronization is canceled by specifying G80.
2) The synchronous ratio is calculated from T and L command in G81
block and the number of position detector pulses per rotation about
the tool and the workpiece axis (parameter setting).
3) This function has the retract function like the hobbing function.
4) The cutting helical gear is performed by specifying Q command
(module or diametral pitch) and P command (gear helix angle) in G81
block.
5) The Spindle EGB synchronization is maintained regardless of
whether the operation is automatic or manual.
20.8.3
Spindle Electronic
Gear Box
General