Power draw bar is an essential tool used for unclamping and clamping a collet at the spindle of a milling machine. But, what if you search for alternatives or different names for power draw bar? You'll most likely hear them referred to as either "PDB" or "automatic power drawbar." Power drawbars have varying designs and names, but regardless of the type, they are all similar in how they function. Some other synonyms for power draw bar are: automatic tool changer, pneumatic power drawbar, and mechanical power drawbar. While these names may vary, their purpose remains the same: to enable easy and quick clamping and unclamping of collets.