broken bits

[calm n sedated]

Clyde, is it full carbide or just carbide tip? If it's a tip and the shaft is hss, grind it or bore a flat surface on the fractured end. Next tap it or just drill a smaller diameter hole with a full carbide bit and lubrication. Now back it out with an extractor. Worse comes to worse you may have enough space to spot weld a rod to the flattend end of the bit or the hole that you drilled into the fractured bit and crank it out.

[Iron Art]

Clyde, As a last resort, befor starting over, if its one of the verticle holes in the track frame, take a cutoff wheel or grinder and excavate it out, could use a burr, weld up the damage and grind the area smooth or set it up in your mill and finish the repair, redrill and retap. Steel and small taps are not real easy to work with. Fred