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Tru′ing-tool.

A device for truing the face of a grindstone, or any other surface for which it may be adapted.

Brown and Sharpe's grindstone truing-tool.

Fig. 6682 is a grindstone-truer, for keeping the face in good shape. It works automatically, and while the stone is in use. The bottom piece is clamped upon the trough close to the face of the stone; then by turning the hand-wheel the threaded roll is brought into contact with the face of the stone, and is allowed to remain so long as is requisite to produce the desired result. The water is to be left as usual in the trough. When by long use the thread on the hardened roll becomes worn it is re-cut.

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