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Here is a jig to set the angle on a dry grinder. It can be made for any angle.
My grinder set up is an 8” half-speed machine with the Veritas tool rest. The wheel is a 46 grit Norton 3X.
Adjusting the tool rest for a specific angle needs to take into account two factors, the diameter of the wheel and the thickness of the blade.
As the diameter of the wheel becomes significantly smaller, it will be necessary to make a fresh jig (I emphasise “significantly” smaller since a little bit here-or-there is not important in the grand scheme of things). The only jig I am aware of that adjusts for different diameter wheels is the Tormek. However the is not enough room to use one on a dry grinder with wheel guards.
Each time the jig is used, it must account for the thickness of the blade. This is done by placing the blade on the tool rest, and then the jig on top of the blade.
Tighten the tool rest setting once it is set up as in the above picture.
The dimensions are not relevant and may be made any size you please. The jig in the picture will grind a 25-degree hollow.
Regards from Perth