Sharpening Study Images

March 13, 2012

Recently, we shot a couple of video lectures on sharpening. The images I show in them didnt show up the way I had hoped in the video, so I thought I'd post them here. Click the images to see them in a larger size.

Here we go...

First up... Double Bevel Knives

Sharpening diagram of a double-bevel knife: side view with lettered edge lines, and edge cross-sections for 50/50, 50/50 microbevel, 70/30 equal angles, 70/30 unequal angles and 99/1

Two double-bevel edge cross-sections: one with four numbered bevel stages ending in a small microbevel, and one with a single bevel

Four numbered cross-section sketches of double-bevel edges with different bevel shapes

Overlaid cross-sections of a double-bevel edge in three colors, showing the bevel moving higher as the blade is sharpened

And now, Single Bevel Knives

Single-bevel knife diagram labeling the shinogi line, lamination line, edge, kissaki, hagane, jigane and urasuki, with new lines after sharpening and the tip contact areas for steps 1 and 2

Four single-bevel cross-sections: 1 sharpen from the shinogi line down, 2 from the lamination line or halfway to the edge, 3 uraoshi sharpening, 4 blend for a hamaguri edge

Outlines of a yanagiba, deba and kamagata usuba, each with a blue line marking the shinogi

Cross-section of a single-bevel blade labeling hagane, jigane, urasuki, shinogi line, lamination line, first and second bevels and the optional microbevel