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Inertia
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL INFORMATION Gear Tooth Parts The    outside    diameter    of    a    gear    is    the    diameter measured over the top of the teeth. The root diameter of a gear is the diameter measured at the bottom or roots of the teeth. The center distance is the distance between the centers of two meshing gears, the pitch circles of which are tangent to each other. The diametral pitch of a gear is the number of teeth for each   inch   of   pitch   diameter,   and   is   found   by   dividing   the number of teeth by the pitch diameter. The circular pitch is the distance from the center of one tooth to the center of the next, measured as an arc along the pitch circle. The working depth is the depth to which the teeth in a meshing  gear  enter  into  the  spaces  between  the  teeth  of  the opposing gear. The clearance is the amount by which the tooth space is cut deeper than the working depth. The face of the tooth is that part of the tooth curve that is between the outside circumference and the pitch circle. The flank of the tooth is that part of the working depth of the tooth which comes inside of the pitch circle. Gravity The attraction of bodies toward the center of the earth. Under the influence of gravity alone, all bodies fall to the earth with  the  same  velocity  and  with  the  same  acceleration.  The acceleration  increases  with  the  latitude  and  decreases  with the elevation above the level of the sea.  Its value at the level of the sea in the latitude of New York is 32.16 feet per second. (In the metric system, Gravity equals 9.81 meters per second at 45 degrees latitude and sea level.) Hardness Is that property of a material by virtue of which it resists penetration. Helix A  spiral.    A  coiled  spring  or  a  screw  thread  forms  a helix. Also,  a  spiral  cut  on  the  side  of  injection  plunger  for metering fuel. Hydraulics The science dealing with liquids in motion. Hypoid Hypoid  (contraction  of  the  word  hyperboloid)  meaning that  the  pinion  is  offset  with  respect  to  the  center  line  of  the ring gear. Inch-Pounds A term used to denote work or energy. Land One of the sharpened ridges which make up the cutting section of a tap, die, reamer or milling cutter after the flutes or chip clearance spaces have been removed. Lead The     longitudinal     distance     which     a     screw     thread advances when turned one complete revolution. Horsepower Horsepower   (abbreviated   H.P.)   is   the   unit   of   power adopted for engineering work.  One horsepower is equal to 33, 000  foot-pounds  per  minute,  or  550  foot-pounds  per  second. The  metric  horsepower  is  equal  to  75  kilogram-meters  per second,  or  542.5  foot-pounds  per  second,  or  32,  550  foot- pounds per minute. The kilowatt used in electrical work equals 1.34 horsepower; or one horsepower equals 0.746 kilowatt. Velocity Velocity  is  distance  divided  by  time,  and  is  expressed in feet per minute, miles per hour, etc. CTS-2128-L  Page 10 PRINTED IN UNITED STATES OF AMERICA

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