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  1. Derek122

    Please - I need help drilling holes

    Thanks for all the responses. The Step-Bit sounds like the way I want to try first. Do you have a link for such a bit? Thanks
  2. Derek122

    Please - I need help drilling holes

    I am trying to drill holes in a RC60 chrome alloy material. The challenge is that a 3/8" hole exisits already, and when I try to drill a 5/8" hole, we get lots of vibration. The part is not flat, which makes it more difficult. Any ideas please of a drill bit you think will drill such a meterial...

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