Grigg's on the right path John. I'm dealing with a small
broken tap inside of a steel bushing on my mill. I'm gonna
tig weld a stub to it so I can grab hold of it and pull
the bushing out.
Trying to drill a broke bolt directly on center is difficult
to do without a guide and usually ends up with your drilling
into the threads.
I did have to drill a broken bolt in my 261 harmonic balancer
recently. I used a guide bushing to keep my drill on center:
http://www.pbase.com/dennygraham/image/161629463 Had that not worked I would have resorted to the tig method
like Grigg suggested.
(My lesson learned...always use grade 8's!)
dg
