. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . isfirst edged on the coarse side and the fine side is thenused to further remove the imperfections of the previousoperation. Water or oil may be used to lubricate thestone. Some mechanics prefer one and some the is optional which is used. If it is desired to producean especially keen and delicate edge, the surface of thestone should be tiempered with wax or vaseline. These Tlie Use of Abrasives 95 substances fill the pores and interstices o
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . isfirst edged on the coarse side and the fine side is thenused to further remove the imperfections of the previousoperation. Water or oil may be used to lubricate thestone. Some mechanics prefer one and some the is optional which is used. If it is desired to producean especially keen and delicate edge, the surface of thestone should be tiempered with wax or vaseline. These Tlie Use of Abrasives 95 substances fill the pores and interstices of the surfaceand regulate the sharpening process. A small hand stone should also be in every mechanicstool kit. This will be found very useful in sharpeningsmall drills, reamer edges, compass points, etc. The following words on the technique of the grindingwheel should prove to be of interest to the average me-chanic, as the information given will help him to choosethe right wheel for the right place, as one big manu-facturer puts it. Grinding wheels should be adapted to the particularkind of work they are to be used for. Shape, grade, grit. Fig. 60—Driving a grinding head witli a hand grinder and l)ond should be considered when choosing a wheelfor a certain class of work. The importance of this isobvious to the careful mechanic. Grit—The grit of a wheel is determined by the sizeof the abrasive particles that compose it. Coarse gritwheels are composed of large particles and the finer 96 Model Engineering wheels of smaller particles. The grit is determined by thennmber of meshes to the linear inch of a sieve that theparticles composing the wheel will pass through. Thesenumbers generally run from 12 to 150. Low numbersindicate the coarse wheels, and high numbers the finergrit wheels. Where large, heavy cuts are to be made,wheels of a coarse grit should be used. In more delicateoperations where great accuracy is sought, wheels of afiner grit should be used. Bond—The bond of
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