Machine Tools and Workshop Practice for Engineering Students and ApprenticesLongmans, Green, and Company, 1905 - 444 страници |
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addendum circle adjustable angle plate automatic bearings bolts boring brass calipers carried cast iron centre change wheels chisel chuck cone crank cutting edges cutting tools cylinder diameter diametral pitch disc distance driving emery wheel face plate feed finished fitted fixed forged gauge grinding grinding machine grip groove ground guide screw hammer hardened headstock heat holes hydraulic jaws lathe length lever machine tools mandrel measured metal mild steel Millimetres milling cutter milling machine motion number of teeth obtained operated parallel piece pinion pipe piston pitch circle placed planing machine poppet position pressure pulley reamer rest revolutions per minute revolving rivet rotated saddle screw threads secured shaft shank shown in Fig side slide slot speed spindle square standard surface taper threads per inch tooth traverse turned turret turret lathe valve vertical worm wrought iron
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Страница 259 - Oil is used in milling to obtain smoother work, to make the mills last longer, and, where the nature of the work requires, to wash the chips from the work or from the teeth of the cutters. It is generally used in milling a large number of pieces of steel, wrought iron, malleable iron, or tough bronze. Frequently when only a few pieces are to be milled, it is not used, and some steel castings are milled without oil ; also in cutting cast iron it is not used. For light, flat cuts it is put on...
Страница 268 - Circular pitch is the distance from the centre of one tooth to the centre of the next tooth, measured along the pitch circle.
Страница 61 - Another very important operation on the twist drill is that of "backing off" the rear of the lip, to give it the necessary clearance. In Fig. 28 the bed is turned to about -£ degree, as for cutting a right-hand spiral, but as the angle depends on several conditions it will be necessary to determine what the effect will be under different circumstances. A study of Fig.
Страница 268 - If a gear has 40 teeth and the pitch diameter is 4*, there are 10 teeth to each inch of the pitch diameter, and the diametral pitch is 10, or in other words the gear is 10 diametral pitch.
Страница 16 - The chief mechanical principle embodied in the construction is that of a screw free to move in a fixed nut, an opening to receive the work to be measured is afforded by the backward movement of the screw, and the size of the opening is indicated by the graduations.
Страница 280 - ... small ends by filing ; the longer the teeth the more we have to file. If there is any doubt about the strength of the teeth, it is better to lengthen at the 'large end, and make the pitch coarser rather than to lengthen at the small end. Data for These data are needed before beginning to cut: 1. The pitch and the numbers of the teeth the same as for spur gears. 2. The data for the cutter, as to its form : sometimes two cutters are needed for a pair of bevel gears. 3. The whole depth of the tooth...
Страница 21 - Vernier is smaller than each division on the bar by one thousandth part of an inch. If the sliding jaw of the Caliper is pushed up to the other, so that the line marked...
Страница 61 - The line r being parallel with the face of the mill, the angular deviation of the bed is clearly shown at a, in comparison with the side of the drill. From a little consideration it will be seen that while the drill has a positive traversing and rotative movement, the edge of the mill at e...
Страница 280 - O, q' r' perpendicular to k O, and so on. The distance between the cone-pitch lines at the inner ends of the teeth m' n' and q' r' is called the inner or smaller pitch diameter, and the circle at these points is called the smallest pitch circle. We now have the outline of a section of the gears through their axes. The distance mr is the whole diameter of the pinion. Diameter'™'?
Страница 23 - Referring to the cut (Fig. 525) it will be seen that the jaw is open two-tenths and three-quarters, which is equal to two hundred and seventy-five thousandths (.275). Now suppose the vernier was moved to the right so that the tenth division should coincide with the next one on the scale — which will make...