A Loss of Concentration

This was to be the front spool end of a reel.
IMG_4043
The very last machining operation is to plunge mill 10 larger lightening holes. It is a repetitive operation; plunge, index 30 degrees, plunge again. But at this radius, the part already has two countersunk holes meant for the knob and counterweight screws. So while my mind was in AUTO mode, I wiped out one countersunk hole.

I write this blog more for myself than for any audience. By carefully documenting stupid errors, I might better avoid them in the future.

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2 Responses to A Loss of Concentration

  1. Jerry Hilgenberg says:

    Careful documentation, huh? Let me know how that turns out.

    As someone with a lifetime of stupid errors, perhaps I should have been doing more to publicize them. J

  2. snapdragons says:

    You make mistakes???

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