My terrible terrible bolt conundrum

by Hans

Well, as I was posting on Patreon, my efforts to remove this damn bolt in my cylinder head have gone amusingly bad.
But I can confirm a couple of small points.

A carbide bull-nosed burr can definitely cut through an ez-out.

A custom turned drill-guide will make it nice and centered, worked GREAT.

When you get past the bottom of the offending ez-out, the rest of it just falls right out.

A carbide burr in that kind of situation, breaking through into open material, sometimes can wedge and break.

I now have about a 1/4" length of a 1/8" diameter carbide burr wedged in the bottom of an even deeper hole.

Alum really doesn't work if you can only apply a few drops at a time, evaporates too quick when you add heat.


Posted on Mar 7, 2017, 4:59 AM

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  1. out of interest.... Kandinsky, Mar 7, 2017
    1. 'Yota. Hans, Mar 7, 2017
      1. yeah. Kandinsky, Mar 7, 2017
  2. Tacky, but ... LostinAPhogg, Mar 7, 2017
    1. Unfortunately, no. Hans, Mar 7, 2017
  3. Im betting this is holding the head onto the block? nt. Renegade_Azzy, Mar 7, 2017
    1. Only mentally. Hans, Mar 7, 2017
  4. Probably a bad idea,,,. Spike, Mar 7, 2017
    1. Only one reason...... Hans, Mar 7, 2017
      1. How deep is that 1/8" hole?. Kymation, Mar 7, 2017
        1. Another option.... Doc Nickel, Mar 7, 2017
        2. Tantalizingly close. Hans, Mar 7, 2017
  5. A thought in the dark. James, Mar 7, 2017
    1. Enough. Hans, Mar 7, 2017
      1. Bolt stub "giving" would be worse. Bruce Bergman, Mar 9, 2017
  6. DIY Spark Erroder. Moriniman, Mar 8, 2017
  7. Hackneyed EDM with a gouging rod. Deranged gadgeteer, Mar 10, 2017


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