I think I'm almost an expert at this now. I spent 2 weeks drilling out broken bolts on a 950 ford just a while back.
on the bolts that sheared weird so they are hard to center punch for the drill, I would take a small abrasive stone for sharpening a chain saw blade and use it to manually make a flat or domed pilot spot that I could then punch.
for a bolt as big as a 5/8 I wouldn't bother withleft handed bits... on smaller bolts i start with a small bit then drill up and when I get up to at least half the bolt diameter I'd switch to a lefty to see if it would pull it out. pas tthat keep drilling up till you can get a big extractor into it then pray. if that don't work, don't get brutal and break off the extractor.. insteadkeep drilling up till you get to where you can chase the threads and pick the thin stuff out. I like to use carbide bits for drilling out if not using lefty's..
use plenty of cutting coolant so your bits last and stay sharp.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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