What is the purpose of a drill press stop?

• A. To limit the travel of the quill and control hole depth.
• B. To adjust spindle speed automatically.
• C. To clamp the workpiece in place.
• D. To measure hole diameter.

Answer: (A)

A drill press stop is used to control how deep the drill goes into the material. By adjusting the stop, you set the maximum travel of the quill so the drill will penetrate to a precise depth every time. This is crucial when you need uniform hole depths or when you’re avoiding drilling through the far side of the workpiece. Once the quill reaches the depth you’ve set, the stop contacts the housing and prevents further movement.

The other options don’t fit this purpose: spindle speed is changed with the speed control, not a depth stop; clamping the workpiece is done with a vise or clamps rather than a depth stop; and measuring hole diameter is done with gauges, not by stopping the quill’s travel.