Wheels on Rotary Cutters are sharpened according to the angles shown below. The calculation of is measured according to the drawing to the right.
These are sharpened using the Tormek SVD-186 or SVD-185 jig, but with the thumb nut replaced by a hand wheel. The use of a hand wheel is critical to ensure it is rotated with a constant and even rotational velocity. This constant rotational speed helps assure even sharpening around the circumference of the cutting edge.
I made my hand wheel on a metal lathe (pictures are at the bottom of this page), but these are also available from sources like McMaster-Carr. This jig is used from the horizontal position, with the blade positioned as shown, and the grindstone rotating towards the blade.
||This is a best estimate; it is best to match the existing edge if possible.
For the final sharpening, I've found it best to use the Tormek SJ-250 wheel, and use this for sharpening the cutting wheel as a micro-bevel (i.e., 2° - 5° greater than ). That is shown on the top right drawing as the hazy area at the tip of the edge. (For more information on this, see the Pocket Knives page.)
Good videos showing use of the customized jig:
|Sharpening Rotary Cutter, Part 1|
|Sharpening Rotary Cutter, Part 2|
|Tormek AngleMaster WM-200|
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