Re: Motorized Bicycle Take a Tip...Leave a Tip
Less RPM is generally better for drilling metal, especially steel. This is an easy one to forget as it seems a little counter-intuitive. If you have an average drill press with the belts that move around to change speeds just put it on the slowest speed when drilling steel for bits around 3/8's and larger. For small bits maybe the next speed up.
There is a formula for this but with the average drill press with preset RPM ranges no need to bother.