Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 150

When a stone gets worn out of the circle, say 1/2 in. to 3/4 in., it should be trued up again, and this is best done when the stone is dry. To do this, get two old flat files, or two short pieces of flat bar iron and a piece of stout hoop iron about 18 in. long; firmly cramp the hoop iron between the other pieces, allowing the end to project about 1/4 in., and with this turn the stone away. It is surprising how it will cut, and by turning the iron over occasionally a good cutting edge can be kept upon it. The expenditure of a few minutes occasionally will keep a stone in perfect order and make its use a pleasure instead of a trouble. Another method, probably not so good, is to true a stone with a simple piece of hard steel, such as a worn-out file, this being held so that as the stone turns it scrapes against the parts that project further than the general surface. The file must be held resting close to the scraping end rigidly against a firm part of the framing of the grindstone stand. The tool is thus made to turn down the unevenness. The point to be attended to is to hold the tool quite firmly without any motion to and from the centre of the stone corresponding with its rotation. The stone will yield to the steel more readily if well soaked in water before being treated.

Fig. 435.—Treadle Grindstone on Iron Stand.