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Old 01-02-2015, 07:11 AM
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Chainreaction Chainreaction is offline
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Join Date: Dec 2014
Location: Tulsa OK
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Default 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.
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