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The subass embly is loaded and unloaded by lifting the clamp ( 3 ) , thus compressing spring (4 ). The attachment is mounted on the projector table standard- m ovement pallet lever is shown on the screen. A s caled drawing on tracing paper or glass , with lines which indicate the permissible limits of the wheel-tooth radius and impulse - face length, Tightness of the assembly of wheels on pinions is checked by random inspection on the device described below. The pinion is clamped in the collet of the device used, and a moment - creating weight is suspended from the wheel (see Table 2 ). The assembly is considered satisfactory if the wheel on the pinion does not slip under the weight. Barrel Ass embly The barrel assembly consists of the barrel body itself (Figure 2 2 , a ), the cap (Figure 2 2 , b ) the arbor (Figure 2 2 , c ), and the mainspring with b race (Figure 2 2 , d ) . The m ainspring i s supplied t o the watch plant i n a finished state . The radial and face run- out of the ass embled barrel must lie within specified limits . The maximum permissible radial run- out for the gear rim of the "Pobeda " wristwatch barrel is 0 . 0 1 5 m m . The m aximum permissible face run- out on the rim circumference is 0 . 02 mm . These re causes the arbor to m ake full use of any radial clearance of the arbor in the barrel. In order to satisfy such requirements , the radial clearance of the arbor in the barrel must not be more than 0 . 005 to 0 . 0 1 0 mm, which is achieved by boring the holes in the barrel and cap on th::: S - 7 9 copy-boring machine . FIGURE 22. Barrel subassembly: a-barrel body; b-cap; c-arbor; d -mainspring. 3 85 |