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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.
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.
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
30, 31 - Flattening the ura using a wooden stick to apply pressure. Be sure to apply pressure evenly.
35, 36, 37
38, 39 - If pin is too tight, use this technique to "stretch" out the pin a little bit more.