Tool direction of rotation

- Rightward rotation when the tool turns right seen from the motor side (looking at the tool it turns anticlockwise).
- Leftward rotation when the tool turns left seen from the motor side (in this case the tool turns clockwise).

Direction of rotation for drills

- Rightward rotation: right threading, tool with upper fitting and clockwise direction.
- Leftward rotation: left threading, tool with upper fitting and anticlockwise direction.

Bore

The bores are made with H6 tolerance for connection with shafts with g6 tolerance.

Balancing

All the rotating components are balanced dynamically according to grade G = 16, while the groups of special tools fitted on the hub are balanced according to grade C= 40. Statistically the balancing grade is G = 6.3 for components while for assembled groups the grade is G = 16. The balancing grades are described by standard ISO 1940-1 and concern the maximum speed admitted for the tool.