How to use the hole saw RPM calculator
- Pick the material you're cutting: mild steel, stainless, or aluminum.
- Pick your hole saw size.
- Set your drill or drill press inside the range shown. Start at the low end and only speed up if the cut stays clean.
Why hole saw speed matters
Running a hole saw too fast is the quickest way to wear it out. The teeth heat up, lose their edge, and start rubbing instead of cutting. A bigger saw's teeth travel farther with every turn, so larger saws need slower speeds. Harder materials like stainless need slower speeds than mild steel, while aluminum can run faster.
Tips for longer hole saw life
- Use cutting fluid on steel and stainless. It keeps the teeth cool and helps clear chips.
- Keep steady, moderate pressure. Too little lets the teeth rub and glaze over. Too much can chip them.
- Clear the chips. Back the saw out now and then on deeper cuts so chips don't pack into the teeth.
- Listen to the cut. Squealing, smoke, or blue chips mean you're running too fast.
- Hold the work solid. Chatter chips teeth fast. A rigid notcher or a good vise makes a big difference.
Frequently asked questions
What speed should I run a 1-3/4" hole saw in mild steel?
About 195 RPM, or anywhere from 170 to 220 RPM. A 1-1/2" saw in mild steel runs about 230 RPM (205 to 255 RPM).
Do these speeds apply when notching tube?
Yes. Use the size of the hole saw and the material of the tube you're notching. The same speeds apply whether the saw is in a drill, a drill press, or a tube notcher.
Why is stainless so much slower?
Stainless hardens when it gets hot. If the saw spins too fast or rubs, the surface hardens and the teeth can't bite. Keep the speed low and the pressure steady so the teeth keep cutting.
My drill won't go that slow. What should I do?
Use the lowest gear or speed setting, keep light steady pressure, use plenty of cutting fluid, and give the saw a break between cuts so it doesn't overheat.
Do these speeds work for carbide-tipped hole saws?
These are recommended speeds when using bi-metal hole saws. Carbide-tipped saws often run at different speeds, so check your saw's packaging.