. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . s a small bench grinder, thearrangement sho\\m in Fig. 60 may prove to be of interestto him. The clamping disc of the bench grinder is re-placed by a wooden pulley with a groove large enough toaccommodate a sewing machine belt. The polishing headis placed close enough to the bench grinder so that onemay work conveniently at the former while driving itby means of the bench grinder. If a motor is used, arheostat would make a very valuable addition to
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . s a small bench grinder, thearrangement sho\\m in Fig. 60 may prove to be of interestto him. The clamping disc of the bench grinder is re-placed by a wooden pulley with a groove large enough toaccommodate a sewing machine belt. The polishing headis placed close enough to the bench grinder so that onemay work conveniently at the former while driving itby means of the bench grinder. If a motor is used, arheostat would make a very valuable addition to the out-fit, as a variation of speed is desirable for differentclasses of work. The grinding head should be provided with an assort-ment of wheels of various shapes, sizes and grits, as everywheel should be adapted to the particular kind of work 89 90 Model Engineering it is to be used for. A wheel 3 inches in diameter by1/2 inch thick is a very good size for general work whennsed with the small polishing head shown in the such wheels can be purchased for about 40 cents each,it is advisable to have four or five on hand of various. / ? Fig. 55—A grinding outfit for the model engineers workshop grits; from very fine grit to coarse grit. Several roundedge wheels of varying thickness should also be on hand,as there are many different jobs and operations wheresuch wheels can be employed with great convenience, asin the cutting of grooves, <etc. For very fine and accuratework, small wheels of fine grit should be employed. Suchwheels are commonly kno^m as jewelers wheels, and ow-ing to the difficulty of procuring them with an arbor largeenough for use on a half-inch spindle, the little ^^kinkshown in Fig. 56 may be used. The wheel is clampedbetween two washers by means of a 10-24 machine screwand nut. The protruding end of the machine screw isthen placed in the chuck of the polishing head. As these TJie Use of Abrasives 91 wheels can be purchased for 10 cents apiece, i
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Keywords: ., bookcentury1900, bookdecade1910, bookidmodelmakingi, bookyear1919
