HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 101)

HEIDENHAIN CNC PILOT 4290 101
3.7 Load Monit
o
ri
ng
Machining using load monitoring
During use of the load monitor, a worn tool should require significantly
more torque than a sharp one. As a rule, drives that are subjected to
considerable loads should be monitored. That usually means the
spindle.
Due to the relatively small torque variations, it is difficult to monitor
machining operations with small cutting depths.
A decrease in torque cannot be identified.
Defining the monitoring zones: The reference values for torque
depend on the maximum torque values of the zone. Therefore, lower
torque values cannot always be monitored.
Facing with constant cutting speed: The spindle is monitored as
long as the acceleration is <= 15 % of the mean value from maximum
acceleration and maximum braking deceleration (MP 811, ...). Since
acceleration increases as a result of the increase in rotational speed,
the CNC PILOT usually only monitors the period after the first cut.
Empirical values for the machining of steel:
„ For longitudinal turning the cutting depth should be > 1 mm.
„ For recessing the cutting depth should be > 1 mm.
„ For hole drilling, ensure that the diameter drilled is between 6 and
10 mm.