Posted by Steve@Advance on September 19, 2016 at 19:42:39 from (107.203.134.67):
In Reply to: Broken Head Bolts posted by Super-H-Mike on September 19, 2016 at 15:36:16:
One trick I have used is to make a drill guide block.
If you have access to a Bridgeport mill, or even a good, straight drill press, get a block of steel about 1 1/2" thick, drill a known straight hole through, then drill another hole large enough for an adjoining bolt to go through. Line up the first hole over the broken bolt, bolt it down with the good bolt. This will hold the drill centered and straight over the broken bolt. Once you get a pilot hole drilled, open the drill guide to the size tap drill you need, drill it again.
If you can get to a Bridgeport, you can even use the head as a pattern to know the exact location of the broken bolt. Make a block that will span 3 holes, with the broken bolt in the middle. Use flat head bolts to hold the block down, and the center hole will automatically be centered over the broken bolt.
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