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A Guide to Sharpening & Caring for Japanese Chisels posted on 11:03am by David
How to break-in and care for your Japanese chisel.

When a new chisel with a hooped handle is received, quite often the hoop is loose. This is common to all Japanese chisels. The function of the hoop is solely to keep the handle from splitting. Therefore, the hoop should be properly seated prior to use. To do this, first remove the hoop from the handle and place the top portion of the handle on an anvil. With a metal hammer firmly tap all around the top 5/8" of the handle. The idea is to compress the wood so that the hoop can be driven approximately 1/32" to 1/16" below the top of the handle. After several days, the wood will swell and bind the hoop firmly to the handle. I like to speed this up by soaking the handle over-night in a light bodied tung oil based finish such as Sealacell.

Many woodworkers are initially concerned that the flat area directly behind the cutting edge will be eliminated with repeated sharpening thus rendering the chisel useless. However, this will not occur if the following simple sharpening steps are taken.

A new chisel should always be honed prior to use. First, the back of the chisel must be honed on a flat coarse stone (#1200 or #2000 grit stone preferred) until the area directly behind the cutting edge is completely flat across the width of the chisel. To do this, rub the back of the chisel side ways along the length of the stone. The proper technique is to keep the chisel flat on the stone with finger pressure applied directly on the bevel. Keep rubbing until the area directly behind the cutting edge is flat. This will be obvious by inspection. Second, transfer the chisel to a flat #6000 Finishing stone or #8000 Polishing stone and hone as above until a mirror surface is obtained.

Future sharpening will require that the chisel back be honed only on the Finish or Polish stone unless after repeated sharpening the cutting edge reaches the hollow grind. If this happens, it is easily corrected by following the above procedure until about 1/32" of flat area is re-established.

After the back has been honed and polished, the bevel of the chisel is sharpened. This is done by rubbing the bevel on a flat coarse stone until the "burr" is turned up. At this point, transfer the chisel to the finish stone and alternately hone the bevel and back of the chisel until a razor edge is obtained.

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