Drilling on a concave surface
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  1. #1
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    Default Drilling on a concave surface

    I was looking for opinions here on drilling this part. I have a .050-.055 diameter hole that I need to drill on the side of this part. Material is 418 stainless and it will be heat treated to 36rc. Quantity of 40.

    I bought some stubby carbide drills from M.A. Ford that have just enough flute to drill the hole. My question is, should I finish the concave surface first so there is less material to drill through (about .100) or leave a flat for the drill to enter and then finish the surface.

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  2. #2
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    I appears you are drilling normal to the surface which would make it less likely to walk. If you are concerned use a center drill it should be fine

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  4. #3
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    I agree with Gustafson. You should be fine. If it did become an issue you could just program a spotface interpolation to give yourself a flat starting face.

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    I would get it started with a .047 ball em.

  6. #5
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    The MAFords will drill straight, they do just fine for me. 305 series?

  7. #6
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    Thanks all


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