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Timber Framers Guild 2007 Western Conference: Kanna (Japanese Wooden Hand Plane) Preparation - 2007/04/11

Go back to the TFG 2007 Western Conference Main page.

Session highlights:

1, 2, 3, 4 - Use the scraper in a circular motion. Scraper soles are also conditioned similarly to the plane's dai.
5
6
7
8, 9 - Some notes:
  • Flatten the back (ura) for both the main blade and the chip breaker. This is the most important step and has to be done first.
  • When main blade and chip breaker are put together, should not see any light between them, otherwise wood shavings will get trapped in between.
  • For fitting the main blade to the dai, remove wood on the bedding angle using a chisel. This is the method they prefer, instead of scraping with a file.
  • From his experience, if you strike the dai with a wooden mallet 3 times from 12 inches away, then it's tight enough.
  • To ensure flatness of the sole, check with winding sticks. Then use a wide plane and plane the sole flat.
10
11, 12 - For contact points, aim for a contact area about 3/8" long at front of dai and 1/8" infront of blade.
13, 14, 15 - The gap between the contact points (infront of the blade) is about 3 newspaper thick, and 2 newspaper thick behind blade (Note to self: This seems rather thick. It's probably lost in translation.)
16 - When both main blade and chip breaker are set in the dai, the space between them should be just a hair. Senga-san prefers a small flat on the ura - about 1/16" or so. The wider it is, the harder it is to take off the burr. A small flat allows it to make contact with the stone more easily and reduces the sharpening effort.
17, 18, 19
20, 21, 22
23 - Uradashi - pushing out of the hard steel, is done with a large funate (boat) hammer. Hit only the lower part of the soft steel. Avoid performing uradashi when it's cold, or put blade in hot water first.
24, 25
26
27
28
29
30, 31 - Flattening the ura using a wooden stick to apply pressure. Be sure to apply pressure evenly.
32
33
34
35, 36, 37
38, 39 - If pin is too tight, use this technique to "stretch" out the pin a little bit more.