Drawbar (machine tool)

The toolholder or machine taper itself is held by the draw bar and applies force to the spindle, especially when spinning at low speeds.

The drawbar pull is an important component that allows the milling machine to keep the tool in place while it’s being used.

This drawbar has a more hands-on approach because it requires the operator to use a wrench and hammer to perform some twisting and tapping so the cutting tool can be removed.

They work by using compressed air to tighten and loosen the spindle giving the operator an easy way to change tools.

The right drawbar can be the difference between a good or bad milling machine by affecting its lifespan and efficiency.

A W-type external-thread collet (red) being pulled into its spindle seat (green) with a drawbar (blue), clamping and then releasing a shaft.