Originally Posted by mongting
The first thing I did was to buy a Gamma Tension Calibrator.
One question: How often do I have to calibrate it for crank machine?
Depends on your string load.
If you do around 3-5 frames per week, then once every 2-3 month is ok. If you do like 10-20 per week, then every month.
I do about 25-30 per week but, i like to check calibration on my Star 5 every 2 weeks just to be sure.