Rotary Cutters

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.

If you are not up to making one, you can buy it at Colvin Tools.



General Guidelines
Notes
30°
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.)



Notes & Comments
Information regarding Grindstones


Good videos showing use of the customized jig:

Sharpening Rotary Cutter, Part 1
Sharpening Rotary Cutter, Part 2
Tormek AngleMaster WM-200


Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com.


About this site
Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.