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Old 08-25-2011, 07:24 PM
27Tall T 27Tall T is offline
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Make sure that the hole saws you have are used by electricians. I have a set that is over 20 years old and have drilled a lot of metal up to 1/4" mild steel and I have yet to sharpen them. The box that they come in should say that they are electrician's hole saws. Mine are Black & Decker. Also when drilling use a drill press that is set for a very, very slow speed. I had to add an extra set of pulleys to my drill press in order to get it to run slower. Apply (used) motor oil to the teeth when cutting. This has worked for me for a long time and I know it works.
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