A standardized conical interface used to secure toolholders or cutting tools directly into a machine spindle. The wedge action of the matching angles provides both precise concentric alignment and massive friction to transmit torque. They rely on clean, matching surfaces to lock solid and release with a deliberate knock or drawbar mechanism.
Heard on the job
Make sure the machine taper is completely wiped down before you seat that new holder.
Insider tip
A single chip caught in a machine taper will ruin your runout and eventually score the spindle wall.
Also heard as
- taper