When the make, year and horse power of a vehicle are known, Section A of this Catalogue will give you the Part Number of Starting Motor fitted. This information is also stamped on the machine itself. Spare parts for all machines will be found in the Detailed Spare Parts, commencing on page N12. It sometimes becomes necessary to identify pinions and sleeves, main springs, and pinions and barrels that have been removed from machines, so that the above information is not available. In this case proceed as follows: PINIONS AND SLEEVES. First count the number of teeth, and confirm whether the sleeve has a left or right hand thread (see illustration). Then identify from the dimensions given below or, for PINIONS ONLY, on page N6. MAIN SPRINGS. Identify from the dimensions given on page N6. PINIONS AND BARRELS. First count the number of teeth, and confirm whether left or right hand by the chamfer on the teeth (see illustration on page N5). Then identify from the dimensions given on page N5. SLEEVES AND CONTROL NUTS. Identify from dimensions given on page N6.
In the analysis of electric servo drive motors, the equations for the motor indicates the presence of two time constants. One is a mechanical time constant and the other is an electrical time constant. Commercial servo motor specifications usually list these two time constants. However, it should be cautioned that these two time constants as given in the specifications are for the motor alone with no load inertia connected to the motor shaft. Since these two time constants are part of the motor block diagram used in servo analysis, it is important to know the real value of the time constants under actual load conditions.
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