Motor spindle for old german tool grinding machine

Assembling motor spindle from DC motor, internal grinding spindle. But still there was a lot of work: turning, balancing, making power supply unit.
Programs from this video:
1. Fits calculation and other workshop calculations play.google.co...
2. Strobe play.google.co...
Strobe program highly depends on particular phone. If it doesn't work normally on your phone - just cancel the purchase on GooglePlay and Google will return your money.
3. Vibration analyzer: play.google.co...