Using Motor Load And Temperature Display; Automatic Feed Speed Control - Struers Discotom-60 Mode D'emploi

Using Motor Load and
Temperature Display
Manual Cutting Mode
Automatic Cutting Mode

Automatic Feed Speed Control

22
Discotom-60 /-65
Instruction Manual
The motor load and temperature values displayed are relative
percentage (%) values.
Motor load and temperature displays indicate how much force is
being applied to the sample and how hot the motor is. As more force
is applied, motor load is increased resulting in a higher temperature.
A heavy force applied for an extended period of time, can result in
the motor's temperature becoming greater than the safe working
limit. Discotom will then automatically stop cutting to prevent damage
to the motor.
Applying heavy force for a long period of time may also shorten the
life of the cut-off disc.
Feed speed is automatically reduced on overload by the Automatic
Feed Speed Control feature.
This feature protects the Discotom from damage due to continuous
overloading of the motor (150% overload). It can also help quickly
find the optimal feed speed for cutting samples.
If the feed speed is set too high and the motor is overloaded:
- The cutting table automatically stops.
- The table retracts 2 mm.
- The table returns to the position where the cutting stopped.
- Cutting resumes at the original preset speed for approximately
0.2mm (to remove damaged/ burnt material on both cut-off wheel
and sample).
This is called the dressing phase.
- If, during the dressing phase, the motor load stays within
operating limits (the motor is not overloaded), cutting resumes
using the preset feed speed.
- If, however, during the dressing phase, the motor is overloaded,
the feed speed is reduced by 20%, after which cutting is resumed.
- If the motor continues to be overloaded, this cycle is repeated until
the feed speed has been reduced to 10% of the original, preset
value.
When cutting of the sample is completed, without overloading the
motor, the optimum feed speed for this particular workpiece has
been found. The operator can then use this feed speed to cut similar
workpieces.