Do you have a drill bit that's too dull to use? You can sharpen it rather than replacing it if you have a bench grinder, but ...

While these bits are rarely expensive (depending on the material), they can dull and lose their performance quickly. The best bit sharpeners will put a quick edge on a bit as small as 3/32 of an inch.

Drill bit materials Most drill bits are made of high speed steel (HSS). It’s inexpensive, relatively easy to produce a sharp cutting edge, and quite durable.

Drill bit shapes and sizes A drill bit does a simple job, and while the basic fluted design hasn’t changed in hundreds of years, the tip shape can vary to be effective in different materials.

Drill bit materials Most drill bits are made of high speed steel (HSS). It’s inexpensive, relatively easy to produce a sharp cutting edge, and quite durable.

Drill bit materials Most drill bits are made of high speed steel (HSS). It’s inexpensive, relatively easy to produce a sharp cutting edge, and quite durable.

The prolonged usage displaced the drill bit material, resulting in the roughening of the surface. Figure 6. Surface texture analysis of drill bits with increasing usage. Furthermore, a cross-material ...