What should be the maximum allowable RPM when drilling aluminum assemblies?

The maximum allowable RPM when drilling aluminum assemblies tends to be higher than many other materials due to aluminum's relatively low density and its thermal conductivity properties. Drilling aluminum often benefits from a faster rotation speed to create a clean hole and to achieve efficient removal of metal shavings.

A typical maximum speed for drilling aluminum is around 5000 RPM, which allows for optimal cutting conditions. Faster speeds help reduce the contact time of the drill bit with the aluminum, minimizing any buildup of heat that can lead to work hardening or affecting the quality of the hole being drilled.

In contrast, speeds that are too slow may not provide enough cutting force and can lead to issues like increased friction and heat buildup. Hence, 5000 RPM is generally accepted as being on the upper limit where efficient drilling is achieved without compromising the integrity of the material or the drill bit.