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CURRENT RECTIFICATION 315
torn of a wooden frame on which the motor-generator set is to rest, or directly to the bottom of the cast iron or steel base of the set. The larger ends of the springs are attached to the ends of the imbedded bolts. The taper of these springs gives the assembly more stability than would be had were they cylindrical, without at all decreasing their action. With such an arrangement (which sounds complicated but is very simple and low in price) we will guarantee despite the fears of many exhibitors that neither vibration or sound will be communicated to the building.
If the manufacturer of the set, or the contractor who is to install it, is a responsible factor, and desires to support the set by some other method, and is will to guarantee, in writing, against noise or vibration, such guarantee should be accepted.
Brushes
(131) Points of importance with relation to brushes are: (a) they must fit their holders snugly, but not so tight they will stick in their holders, (b) they must relate to the machine in size and be able to carry its maximum current without heating; (c) when new brushes are installed they must be fitted accurately to the commutator curvature. (132) This last may be done by laying No. Yz sandpaper (never emery cloth or emery paper) on the commutator, the ends of the brushes resting on the sand side at normal brush pressure. Draw the paper forward in the direction of the commutator rotation, and repeat the operation until the brush ends fit the curvature perfectly.
If the brushes fit their holder snugly the job may be done more easily and quickly by drawing the paper back and forth until the brush ends are worn almost to the proper curvature. At the finish it is best to draw the paper a few times in the direction of the commutator rotation only. It is a tedious job, but only needs to be done at long intervals.
Do not experiment with brushes. Use only those recommended by the manufacturer of the set.