At what RPM should the drill operate when enlarging holes?

When enlarging holes, operating the drill at full speed is often the most effective choice. This is because higher RPM allows for quicker removal of material, leading to a more efficient drilling process. Full speed ensures that the drill bit can efficiently cut through the material, reducing friction that could generate excessive heat, which can damage both the bit and the workpiece.

Using full speed also provides better chip removal, preventing clogging of the drill bit and promoting smoother operation. Additionally, at higher RPMs, the cutting edges of the drill bit maintain effective cutting action, resulting in cleaner holes with better dimensional accuracy.

While other speed settings like half speed, low speed, or variable speed may be suitable for different tasks, they generally do not offer the same level of efficiency when it comes to enlarging holes, particularly in harder materials where maintaining tool performance is critical. Therefore, using full speed is the preferred approach for achieving effective results in this specific application.