The Pattern Maker's Assistant: Embracing Lathe Work, Branch Work, Core Work, Sweep Work, and Practical Gear Construction; the Preparation and Use of Tools; Together with a Large Collection of Useful and Valuable Tables

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D. Van Nostrand, 1878 - Patternmaking - 324 pages
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Page 262 - Troy Weight 24 grains = 1 pennyweight. 20 pennyweights = 1 ounce. 12 ounces = 1 pound.
Page 263 - Fahrenheit, and the barometer at 30 inches, and such measure is declared to be the " imperial standard gallon, and shall be the unit and only standard measure of capacity to be used, as well for wine, beer, ale, spirits, and all sorts of liquids, as for dry goods not measured by heaped measure...
Page 70 - ... cutting edge of the tool has entered the wood to the requisite depth, the flat face will bear against the work and form a guide to the cutting edge. The corner of the chisel which is not cutting must be kept clear of the work. Fig. 2680 will convey the idea, the arrows showing the direction in which the chisel is, in each case, supposed to be traveling. The short lines A and B, under the arrows, and those touching the collar at C and D, show the tilt or incline of the chisel to the work. In turning...
Page 48 - Tent the stone from becoming hollow in the middle. When it becomes necessary to grind the face of the oilstone, it may be done upon the grindstone ; but a better plan is to take a flat board and liberally supply it with clean sand and water, and then grind the oilstone on it by hand, making the face a little rounding in its length by easing it off at each end, but leaving it flat across the face, by which means it will last longer without regrinding. There...
Page 71 - Some patternmakers prefer to increase the keenness of this tool by holding it so that the plane of its length lies in the direction denoted by the dotted line D ; this, however, renders it more likely to rip into the work, and the position shown is all that is necessary, provided the cutting edge be kept properly sharpened.
Page 72 - D, are therefore right and left hand tools. When, however, the hole is too small to admit of those tools being used, that shown at E may be employed, its cutting edge being at F.
Page 68 - Fig. 61, at A and B, there is but little tendency for it to run forward, and it can be fed easily to its cut. In addition to its use as a roughing tool, the gouge makes a very efficient finishing tool for hollows, though it is not often employed as such by pattern makers.
Page 67 - ... line. But if we were to place the gouge in the position shown at C, the whole of this strain would be placed upon the gouge, tending to force it forward and into the cut, as denoted by the direction of the arrow ; and as a consequence, the gouge would run forward and dig into the work, in spite of all endeavors to prevent it.
Page 244 - In the case of flat, round disks or plates, they will usually be found hollow on the top side, although in some cases the hollow is on the bottom side. This is owing to the following causes : The top and bottom faces, together with the outside edge, become set first through contact with the mould, leaving the centre yet soft. When the centre shrinks a severe strain is put on the plate by an effort to reduce its diameter, which the outer...
Page 244 - ... to shrink away from the outer crust, which resists its so doing ; hence, the interior is kept to a greater diameter than is natural, and there being but so much metal in the entire mass, the atoms are drawn away from the central point toward all directions to supply the demand made by the metal in shrinking.

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