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Yeah, I wasn't talking about work hardening from the grinder, I was talking about hardening from heat from the grinder. I wouldn't be surprised if it happened from hitting rocks, I may have experienced that before.

Like this

Grinding can overheat the tooth which is able to cool too fast and actually harden. Normally the teeth are not hardened and rely on the hard chrome top and side plate for sharpness durability. I haven't had much luck with angles sharper than 35deg, they just dull super fast. I cut wood faster...

Does it harden the teeth so you can't file them by hand? That would be my biggest concern. I'd also be conerned about a lack of tension on the chain allowing the teeth to rock back away from the wheel as I've had that happen sometimes, mainly because the rails didn't clamp a few DL's, they just...

I used a tecomec grinder from 1998 or so, and it sucked. Completely non precision, it was all me. It took me 30-60min to grind a (14-28") chain to my minimum standards once I got it figured out.

I'd save up all the bad chains until it is worth sending out to a robot grinder to true them up.