Influence of the Cap-iron on Hand Plane
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- This topic has 4 replies, 4 voices, and was last updated 9 years, 8 months ago by David Gill.
interesting, I guess I use the cap iron just to hold the iron and not as a chip breaker. But I don’t think my standard cap iron would get close to 80 degrees.
Interesting. Thanks for the link Johan.
1) The cap iron, or chip breaker, in the film is only 0.3-0.1mm from the cutting edge, which is much less than the usual recommendation of 1/32″ (~0.8mm).
2) The test device is essentially a chisel plane. There is no mouth like with a conventional plane. I am wondering how much a tightly closed mouth would affect results.
3) I was impressed to see how effective a shallower cut is at reducing tear-out. The physics makes sense, but the benefit seems exponential.
4) The 80 degree breaker in the film only appeared to be a mere 0.4mm tall. A typical Bailey style chip breaker could easily be modified by grinding/honing a slight vertical on the leading edge. Just saying…
-Scott Los Angeles
Good points Scott, maybe I I give it a try.
I was looking around for some more info and found this:
From Planecraft C&J Hampton Ltd. 1972 impression sponsored by Woodcraft:
Cap Iron Settings:
For rough work: 1/32″ to 1/16″ from the edge
For finishing work: 1/64″ from the edge
For hard woods with irregular grain: “as close as you can get it to the cutting edge”
The publishing history of this book is as follows:
1934 – first published
1943 – 2nd impression
1945 – 3rd impression
1950 – 4th impression (revised and enlarged)
1953 – 5th impression
1954 – 6th impression
1959 – 7th impression (revised and enlarged again)
1972 – Woodcraft sponsored printing of the 7th impression from 1959.
So from what I get it was known how the cap iron/chip breaker could help with tear out even back in the day.
Dallas, Texas16 July 2013 at 7:37 pm #14895
Very interesting, It would be interesting to see what the different iron sharpening methods would have , Convex , concave with and without micro bevels
Wigan, Lancs. England :
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