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716 HANDBOOK OF PROJECTION FOR
that the spare be inserted and the unit in need of attention be sent to the factory, which is the only place such a job can be done right. We give instructions, yes, but only to help those who are by circumstances forced to attempt the removal and replacement of an intermittent sprocket.
INSTRUCTION NO. 9.— TO REMOVE THE CAM ELEMENT OF INTERMITTENT MOVEMENT, GB-77, P. 8, first follow Instructions Nos. 6 and 7. Next remove screw GB-26, P. 4, which is screw in end of flywheel shaft, and key washer GB-25, P. 4, and pull flywheel and pinions GB-22 and GB-24, P. 8, off shaft. You may then pull cam and shaft out through oil box.
CAUTION. — Again we advise against attempting repairs on intermittent unit. Do it if you are compelled by circumstances to, but the parts must, in the very nature of things, fit closely. The measurements are in thousandths, or even ten-thousandths of an inch. The projectionist is seldom or never equipped to work to such accuracy. Better get a spare intermittent unit. Costs something, yes, but is worth it.
INSTRUCTION NO. 10.— ADJUSTMENT OF INTERMITTENT TO ELIMINATE LOST MOTION IN SPROCKET. First turn flywheel in direction it normally runs until intermittent sprocket just stops, then give it about an eighth of a turn more. This insures the intermittent being "on the lock," as is necessary for this adjustment. Next loosen screw GB-8, P. 6 and 8, which will be found in hub of oil casing cover carrying intermittent sprocket shaft and bushing. Release this screw by only about one turn. Do not remove it. Next, using small wrench GB-27 (not shown), or some other suitable wrench, turn hexagon nut of bushing (between sprocket and hub) in whichever direction accomplishes the purpose, at the same time "rocking" intermittent sprocket with finger. When the movement is tight enough that you can barely feel a movement of the sprocket it is right. Tighten up screw GB-8 and the job is done.
CAUTION. — Test for lost motion in sprocket should be made immediately after a picture has been projected, because then the parts are expanded by heat of operation to their operating size. The adjustment should be made when projector is cold, at which time if there be just a slight movement of sprocket, when parts are heated by operation they will be quite sufficiently tight. Remember that if you get them too tight undue friction will be set up, which will