How to fix a ruined temper at the blade edge

Hey,

You have to grind for less time with that dremel tool. Maybe half a second or so and then cool it in water I would say. I don't really know about the steel you are grinding on(I only work on simple carbon steel that I can heat treat myself), but if you are getting any kind of color on the steel at all you are going to long with the dremel. If you put your finger on the blade under where you are grinding you can tell if it gets too hot. If it is too hot for your finger it is too hot for the blade.

HillbillyChuck
 
I believe what happened was you burned the edge just so deep, then by repeatedly sharpening it you've gone by that point into a good un-disturbed part of the tempered steel. you can work harden some steels but I don't believe this happened to you just by sharpening it over and over I believe you worked the edge past the damaged part.. this is just my view point because I'm use to steel with a lot more carbon in it un-like this AUS6A at .65 carbon. just my 2 cents
 
I watched the steel for any sort of color changes or heating up. There was no noticeable color change, and I only got sparks once, and that was when I accidentally pushed down a little too hard onto the bit. In terms of heat, the hottest the steel ever got was warm.

I guess I distributed the grinding over a large enough area and timeframe that there was no deep damage to the steel.

Thanks for the replies, it really helps verify my theory on localized temper burning.
 
not real shure, as I don't use much stainless, but here goes.

I've used dremal cut off wheels and sanding drums on stainless befor and noticed that where the wheel is grinding it gets a very hot surface, maybe for a couple of thousanths, while the rest will only be warm. I think Graymaker is right in that just the outer edge was over heated and after repeated sharpening it was removed.

Next time you might want to go a little slower and cool more often as was said.
 
You must log in or register to reply here.
Back
Top