Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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370 MOTION PICTURE HANDBOOK lined with each other, else there will be undue strain on the coupling of the two shafts. Failure to perfectly line the shafts will probably result in noise, vibration and a rapid wear at both the coupling and bearings. Machines in which the armature of the motor and generator are mounted on one shaft, with but three bearings, and no coupling between, should never under any circumstances be installed without their sub-base, if they are of the type that uses a sub-base. Where a motor and generator .are locked together, on a sub-base or otherwise, it is not necessary to bolt them down solidly to the floor (it is not necessary to build foundations for machines of this character), and if the machine is located in the operating room or in an adjoining room it is not desirable to do so. The best plan is: Have a sheet metal pan made, one to two inches deep and sufficiently large to contain the base of the machine and extend out under the oil boxes. Procure heavy felt — the kind that is from one-half inch to one inch thick, if you can get it, and cut enough to make a pile at least 4 inches thick, cutting the pieces about 3 inches larger than the base of the machine. Place the felt where you propose to locate the machine, lay the pan on top of it and set the machine in the pan. No bolts or fastenings of any kind are necessary. If the machine does not set on the felt without giving trouble the armatures are not properly balanced and the machine should go back to the factory. The idea of the felt is to absorb all the vibration and prevent its being communicated to the floor and the walls of the building. It renders the machine to all intents and purposes noiseless. Caution. — Where direct connected motors and generators are joined to each other by a flexible connection on the shaft, and not placed on a single, rigid iron base, then the pad proposition does not, of course, apply. Such an outfit must be bolted down on a solid foundation. After the machine has been on the pad a week, carefully level it, if necessary, by slipping sheets of metal under the low side. // is very necessary that the armature be perfectly level endwise, else it will not "float" (have end play), and failure to float will probably produce grooved bearings and commutator. Having the machine located, revolve the armature by hand to make sure it revolves freely. Examine the armature and commutator carefully to see that they are not bruised. Let the oil out of the oil wells and fill them up with fresh oil. (See General Instruction No. 3.) The electrical connections