Hand Tools

Subject:
Note on fitting
Response To:
Re: Osae-gani ()

Wiley Horne
Hi David,

To add to your point,

“ and the abutments have to be precise enough since there's no wedge - precise enough to keep the iron tight but not prevent it from getting it to the end of the plane.”

Western and Japanese woodies share this problem of precise fitting of the iron within the abutments. The Japanese plane has evolved to solve this problem by having the iron slightly sprung in the abutments. That’s how some practitioners are able to use the plane with no chipbreaker. The iron comes from the smith with a slight curvature (1-3 thousandths), based on measurements I made of a half dozen kanna some years ago.

Sometimes you see the western woodie with the wedge slightly sprung—scraped just a tiny bit hollow, so as to ensure a tight fit top and bottom of the iron. To be sure, we have also seen western woodies where the wedge was not sprung, just perfectly fitted its whole length. But overall I find it an interesting comparison of two ways to solve the same problem.

Not suggesting the Japanese iron is smithed with this curvature to aid fitting—no, surely it is a natural product of the welding and heat-treating process. But over time, the dai makers (who were often the users) figured out how to use this blade curvature to advantage.

Wiley

Messages In This Thread

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Re: Light vs Heavy planes
Re: Light vs Heavy planes
Re: Light vs Heavy planes
Re: Light vs Heavy planes
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The experiment and conclusion are both confusing
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Re: Jim, what is Osae-gani? *NM*
Osae-gani
Re: Osae-gani
Note on fitting
Re:wedge fitting
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Re: funny...
Re:wedge fitting
biases for the maker...
Re: Light vs Heavy planes
Re: Light vs Heavy planes
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Re: I'm glad you commented.
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Re: what I've found...
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Re: I haven't seen it....
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Re: I haven't seen it....
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Re: expanding on what jim said
Re: expanding on what jim said
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Re: Facts, not assertions
Re: Facts, not assertions
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Re: I think we're agreeing...
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Re: Calling BS
Re: Calling BS
Re: Calling BS
by the early 19th century
Re: by the early 19th century
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Re: more infill weights
now there is a pearl of wisdom
Re: more infill weights
initial fitting...
one more follow-up comment.
Re: one more follow-up comment.
rosewood
Re: rosewood
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