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Table 2-2.  Electrical Systems and Subsystems - Continued
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 3-1.  Tapered Pins and Drill Sizes
TM 9-254 CHAPTER 3 GENERAL MAINTENANCE PROCEDURES Section I.  DRILLING AND REAMING FOR TAPERED PINS 3-1. Tapered Pins and Tapered Holes. a. General.  A tapered pin (fig. 3-1) may be defined as a metal rod with  a  diameter  that  decreases  uniformly. Tapered pins are used to secure one part to another in a positive relation to each other, such as the securing of a knob to a shaft. Figure 3-1.  Assortment of Tapered Pins b. Numbering System.  All tapered pins are tapered similarly (1/4 in. per ft.) and certain diameters are identified with numbers. All pins with the same number would then have the same maximum diameter; therefore, the longer the pin (of any one number), the smaller the minimum diameter. c. Preparation of Parts to Receive Tapered Pin.  When preparing parts to receive a tapered pin, a hole must be drilled and then reamed with a tapered reamer.  The larger the drill used, within the scope of the taper, the less reaming will be required.  Before drilling any hole for a tapered pin, it is necessary to know the minimum diameter of the pin to be used  so  that  a  drill  may  be  selected  accordingly.    Refer  to  figure  3-2  and  table  3-1  for  selecting  the  proper  drill  size required for a tapered hole.  When the proper drill size has been determined, the hole should be drilled and then reamed with a tapered reamer of the correct number. Figure 3-2.  Selection Drill for Tapered hole 3-1

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