Hand Tools

Re: Comparing David's Cap Irons *PIC*

Steve D, CT
Thanks Steve. Your point cannot be overstated.

Taking elements in isolation is misleading because there is no context. The wear on a wooden plane must diverge from the blade and the cap iron for the shavings to flow out. That limits the steepness of the cap iron's lead edge.

Considering the Stanley cap iron, the opening in the mouth is only 4-5mm tall and the slope is away from the edge because of the casting process. Whether the humped cap was a matter of what was desirable or what became possible is open to debate.

An infill will have deep mouth but no wear angle, and there would be an optimum setup for that as well.

Taking a cap iron with a pretty blunt lead (if the illustration is accurate beyond conceptually) and declaring it as "the best" ignores the interactions between the blade and the tool it is mounted in.

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