If you are grinding HSS tool bits to a preferred shape,I have always used either 1-a green tool steel stone or 2-a white slow speed stone.Either way ,keep it coo lto avoid blueing and losing temper.
My go to guide to any sharpening Question is Leonard Lee's book "The Complete Guide to Sharpening". That's Lee of Lee Valley Tools fame and his book has had all the answers for me so far including jigs and grinding stone reccomendations.
Hope this helps,thanks-Tom

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