In the past I have tried to use pierce holes for making where to drill larger holes, and had broken the standard type bits. On a new project I wanted to locate drill holes on the DXF files and use the pierce holes for placement. This time I used a carbide center hole drill and this worked great the smaller center part of the drill cut into the pierce hole and going a little deeper a larger 60 degree tapered mark for a larger standard drill bit to start in. This is the bit I bought for this operation.
https://www.ebay.com/itm/4-Solid-Carbid ... 2749.l2649
Center marking for drilling
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acourtjester
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Center marking for drilling
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plasmanewbie
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Re: Center marking for drilling
Great tip! Never thought of using a center drill! Thanks
