Balanceing

Why Balance Tools?

After adding a cutting tool even to a fine-balanced tool holder, it is possible that the tool holder is beyond the balancing quality grade recommended

Without controlling the balance of each tool holder each time it is inserted into the machine tool, a reliable utilization in the machine tool can not be guaranteed.
Eliminate the costs of machine tool spindle repairs
Avoid the down time of the machine tool while the spindle is repaired
Avoid vibration at the cutting edge = help eliminate chatter
Extend your high end cutting tool life by minimizing vibration
Possible extension and guarantee of machine warranty

Factors of unbalance in milling spindles:

Unbalance of spindle itself
Unbalance caused by run-out error of spindle bearing (axis of symmetry [not = to] axis of rotation
Run-out error of parts mounted on the spindle (i.e. coolant supply, clamping system)
Movable parts in spindle (i.e. Bellville washers of clamping system)
Run-out error of tool holder in spindle
Unbalance of tool holder itself
Run-out error of pull stud
Run-out error of tool
Unbalance of parts mounted to the tool holder (i.e. clamping nut)