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420 MOTION PICTURE HANDBOOK
ed generator pulled by an A. C. motor, the two armatures being mounted on one shaft, and contained in one housing, with a ball bearing at either end of the shaft, both being "ball bearings."
Plate 1 supplies a view of the whole machine, with the various parts numbered.
No. 1. — Lubrication. The lubrication of this machine differs from that of most other motor-generator sets used for moving picture work, in that grease is used instead of oil.
The grease chambers may be filled in two ways: first, if you have purchased your grease in a "gun," or if you have a "gun" which can be filled with grease, having removed screw, 23, Plate 1, and a similar one on the opposite diameter of the grease chamber cover, you can place the spout of the gun in the upper hole and force grease in. This will force the old grease out at the lower hole, and the job will be a fairly complete one. This operation must be performed for the grease chamber at each end of the armature shaft. When through you will, of course, replace the screws.
Another way is, if you have no grease gun, to remove screws 24 (four of them), on the end of the cast iron cap which covers the grease chamber. You can then pull the cap off, clean out the old grease, and pack the chamber with fresh lubricant. Where this is done it would be well to wash out the grease chamber thoroughly with kerosene or gasoline.
Still a third way is to remove screw, No. 23, Plate 1, and insert in lieu thereof a compression grease cup having a stem of the same diameter and thread as a one-eighth inch gas pipe. Where the compression grease cup is used when it is desired to force grease in it will be necessary first to remove the screw in the opposite diameter to screw 23, Plate 1, same being immediately below the grease cup, in order to allow an equal amount of old grease to flow out. Where the compression grease cup is used it is merely designed that the cup take the place of a grease gun — therefore it should be a large one and only used to force a large quantity of grease in about once every 60 to 90 days, it being expected that when the run is, say, twelve to fourteen hours per day one greasing will last for that length of time.
Caution: Don't use any and every kind of grease. The grease serves ball bearings, and if it contain alkalis or acids you may expect trouble and plenty of it. For this reason my advice is : Use only grease procured from the manufacturer of the machine. You may regret it if you do otherwise.