I will use this jig in conjunction with my newly acquired conical disc sander to sharpen the knives on a Grizzly jointer that I am restoring. The knives on the Grizzly seems to be sharpened to 45 degrees. This got me to thinking about the angle to cut the slot in the jig for the blade. Should it really be at 45 degrees as shown on the Shopsmith jig? Given the way the conical disc sander works, won't I be tilting the table about 3-4 degrees anyway? Would it be better to build this 3-4 degree tilt into the jig by cutting the blade slot at, say, 48-49 degrees and then just leaving the table at 0 degrees? That got me thinking about the jointer/planer sharpening jig that Shopsmith sells, as shown here. http://www.woodshoptips.com/tips/052404/index.htm
Does that jig require the table to be tilted or is the tilt angle already built into the jig?