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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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