Detailed insturctions are in the Power Tool Woodworking for Everyone 4th edition on pages 304 - 306.
Ed
Mortising Chisel Sharpening
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Mortising Chisel Sharpening
{Knight of the Shopsmith} [Hero's don't wear capes, they wear dog tags]
If I remember correctly, in Nick's Sawdust Session on using the mortising chisel, he just sharpened the chisel by hand using the appropriately-sized grinding stone. Nick has some comments in there also about the gap between the end of the chisel and the tip of the bit- you may have to adjust that gap for different woods. I don't remember the details, but I'd take Nick's advice if your system works for some woods but not others.
Gary
Gary