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I've read that too and it is confusing .Back to those stuck drum bolts .Another thing I've done it use a hand impact device to break them free .With a big hammer you can get a tremendous amount of impact torque with these things plus they don't cost that much .

With oak it's most likely the tannic acid. I'd have to research to actually find out how it breaks down metals .The 48" bar on the avatar saw would turn black when used on oak which is about all it's been used on .You damned sure don't that big of a bar for normal use . More times than not...

I think the worse stuck I ever saw were the center turret bolts on a Hi-Ranger bucket truck we were changing the booms on ,I don't remember if they were 3/4 or 1"Had a big ratchet with a 10 foot length of pipe and three guys breaking those loose . Damned oak sawdust will do a number on that...

An alloy steel socket head in 5/8" 18 by 21/4" is about 2 bucks a pop McMaster -Carr . I don't see how you could break the head off of one .A soft grade like a grade 2 or maybe 5 but not on an 8 that size .That alloy is rated at 170.000 PSI.

Some engine bolts can be reused and some they recommend not to .With Tom and that old chipper because I had access to them I gave him new bolts .He sold that old thing a long time ago and last I heard he had a self feed Morebark brand .Danged chippers have a lot of maintenance ,something is...

To be accurate I did not design them only maintained them .If a change of torque,final angle or sequence it was under the direction of an engineer .I had the knowledge to a point but am not an engineer by any means .

The main problem as I see it on chipper knifes is more a chemical reaction with the chips plus the high carbon steel used to make the bolts .If you you don't use some type of anti seize compound they are bound to rust tight .Usually on a grade 8 if you drill the head off once the tension is...

A concrete bit would probably work if that's all you could find .Problem would be with an inserted carbide is breaking the insert loose .In my case having worked 29 years in an automotive engine plant I've got quite a selection of solid carbide bits that would be be discarded if after they were...

A bolt thread is a bolt thread .Very seldom will the thread count be anything but standard .SAE threads are given in threads per inch and metric in thread spacing .Most torque specs are given with oiled threads . A bolt in essence is almost like a spring under tension .You have to put the right...

I've drilled out the 3/4" bolts twice on my buds old Lindag chuck and duck chipper .The last time I gave him a can of Never -Seeze and told him that was my last time ever for me .It's on him now .Being a nice guy I gave him some carbide drill bits too

With an allen bolt you're talking grade 8 which is harder than hammered hell . You'd about need a carbide drill to even touch it .An old trick is to use a prick punch or an old drill bit sharped about like an awl to tap it loose..However if it's jambed tight from bottoming out it about has to be...