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Rotary Cutters |
Edge Angle
Wheels on Rotary Cutters are sharpened according to the angles shown below. The calculation of α is measured according to the drawing to the right.
Rotary cutter being held in 3D-printed jig
These are sharpened using the a jig which holds the blade securely whilst allowing it to be rotated when being sharpened on the grinding wheel.
These blades are usually quite hard, so a diamond grinding wheel is recommended. I have found that 1,200 grit (Tormek DE-250) works quite well.
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To be creative is to let little pieces of your heart go and place them into each project you make. Pat Bravo |
These blades need to be honed. As outined in the video, 3D-printed Rotary Cutter Sharpening Jig, paper wheels work well. Experience has shown that 5 micron (µm) followed by 0.5 micron (µm) produces a very fine edge.
The jig shown above is detailed on the jigs page, Rotary Knife Jig. It is mostly 3D printed so it can be made easily and inexpensively.
Example icon
Sharpness scales (as shown in the grey icon to the left) are used to indicate the recommended sharpness for the blades noted above. You can click on any of the icons showing the sharpness scale and be redirected to the page describing this more. Lower numbers are duller; higher numbers sharper.
These are general recommendations; you will need to use your own judgment, based on the knive’s intended purpose.
