Hand Tools Archive

Subject:
Correction
Response To:
Re: curious to know... ()

Bill Tindall, E.Tn.
had those cast iron plates precision ground to flatness.

The motivation was grinding them to smoothness. The surface of cast iron is not smooth from the casting process or in one case the sawing apart of a casting to yield two plates.

If someone used a stone to where it was worn concave it is a good bet they knew what they were doing with the tool being sharpened. And, apparently the hollow of the stone did not affect their use of this tool.

The problem with silicon carbide for flatening is the toughness of this abrasive. It is plenty hard enough to cut silica. But the particles fracture easily when used on something hard like silica. The coarse grit soon becomes a much finer grit from fracture. Go easy on pressure when using this abrasive.

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