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554 MOTION PICTURE PROJECTION
moved, grasp the bushing and star in the left hand, holding the parts with a piece of cloth to prevent slipping, and with the right hand twist the sprocket off gently, maintaining an easy upward pull at the same time. Now making sure that there are no burs or sharp edges in the pin holes in the shaft, push the new sprocket in place. Due to the fact that all work on the intermittent is done on a 1-10,000 basis, it may seem to the unpracticed man, that the sprocket is a little tight for the spindle or shaft. Should this be so, put a few drops of oil upon the shaft and very carefully entering the shaft into the sprocket, twist the sprocket u*i as far as possible until it sticks, then take the sprocket off and repeat this twisting operation, which if properly carried out, results in wearing down the 1-10, 000th surplus thickness of the shaft, and results in a perfectly tight and secure fit.
Caution — Never force or drive the sprocket onto shaft. To do so will ruin both the shaft and sprocket.— After the sprocket is pushed onto the shaft sufficiently far to turn the sprocket so that the large diameter of the holes in the sprocket and those of the shaft are together. Gently drive pins into pin holes, with sprocket laid upon "V" block and unit is again complete. Now wipe the bushing and the star off clean, and lubricate same. Then push bushing into its bearing until the star is pressed against cam or pin wheel. Turn the fly wheel slowly, pushing in on sprocket until cam pin P-279-B, P.5 engages with slot in star S-551-B, P.5, when bushing can be pushed home; now