Every spindle speeder has his test certificate in which there are the technical characteristics, the serial number, the results of the tests made on our BP03 testing bench, the concentricity value between the shank and the collet (max. value 10µ). To verify the concentricity value it is necessary to have the spindle speeder as from picture, stopping the pin “A” and rotating the shank. The value on the dial indicator is the concentricity between the shank axe and the spindle axe.