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Which grindstone should I choose for my Tormek?

First choose the right grindstone size: 200 mm for the T-4 and 250 mm for the T-8. Then choose by what you sharpen:

Original grindstone SG – an all-round stone supplied with the machine. With the SP-650 stone grader you change the surface from 220 grit to about 1000 grit.
Blackstone Silicon SB – for high-speed steel (HSS), such as turning tools
Japanese water stone SJ – 4000 grit for a polished, razor-sharp edge
Diamond wheel DC, DF or DE – 360, 600 or 1200 grit, for any material including ceramics and carbide. Use the ACC-150 anti-corrosion concentrate in the water.

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