Size, spped?

[ZeroMinusOne]

I've got an old GD that is chipped badly. What size (4", 6", 8") grinder and what RPMs should it be to grind the toe down flat so it'll be usable again?

 

[Legion]

I use the sanding drum on a Dremel, personally.

 

[bluesman 7]

There is a relevant thread about this very operation here; Break temper? - https://www.badgerandblade.com/forum/threads/break-temper.609507/