DOGA MDT Series, Instruction Manual

Page: 70 / 84

Instructions manual / MDT Series & MDTC38
60429 08/21 70
TORQUE CALIBRATION AND COMPENSATION
◆
Torque calibration : It is the master calibration for whole torque range of the tool, saved in
the tool memory. The F/R switch should be at Reverse position before writing the new value.
The torque calibration is required when :
- The torque reading on the torque meter is different with
the setting
- Tool is repaired by replacing motor or gear mechanism
- If there is a big mass of the bit which is exceptional from
the normal one, speed should be slower to reduce the
inertia spike.
Torque calibration on the controller panel
When the reading on the torque meter is lower than the setting on the tool, increase the calibration
value more than 100(%) which is basic on production. To increase the output torque 5% more, key
in 105(%). The calibration value works through whole range of torque. It will be refreshed and
stored in the memory chip in the tool. So it can be still effective on other controller.
Be sure that the different torque test conditions can make different torque reading.
- Type of the rundown simulation ( Hard joint, semi-elastic or Soft joint )
- Rundown screw diameter
- Pressing pressure of the tool
- Washer, lubricant and run down screw material
- Tool speed : auto-speed should be used
- Low pass filter of the torque meter
Torque
Rang
e
Min Max
+ 10%
- 10%
100
110
90
A periodical torque calibration is required to keep the accuracy of fastening quality.