Speed control of the belt sander.

Some belt sander speed controls cannot be handled by commercially available controllers. I am using SK11 BDS-100N, especially this device could not be used with AC speed controllers due to the special switch part. Therefore, we made a DC Geared Motor that can be directly attached to the belt drive unit and the speed can be freely adjusted with a PWM output controller.
This makes it possible to make a soft polish with a low sound.