The lock nut eventually wears and the tool can loosen up, especially under load. Thus it must be adjusted periodically. The worst case I saw of this was at a steel mill lab (Tuscaloosa Steel making dog bones for destructive testing). They had tape wrapped around the tool holder to take up the clearance. At that point a new spindle and lock nut were ordered.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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