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Additional info for Gear Handbook : The design, Manufacture and application of Gears
7. HOLE LENGTH FACE WIDTH KEYWAY HOLE DIA. HOLE HUB DIAMETER KEYWAY PITCH DIAMETER PITCH CIRCLE OUTSIDE DIAMETER 4-8 HUB PROJ. 7 Note: Sometimes a pinhole through the hub is required (rather than a keyway). If this is the case, be sure to specify the pin dimensions and location. WORMS GEARS–BASIC DIMENSIONS As noted in our discussion of spur gears, gear dimensions are important because they provide valuable information when determining how best to meet a customer’s needs. Here are definitions you need to know in order to determine the basic dimensions of worm gears.
Now let’s see how the circular pitch of bevel and miter gears are calculated. Circular pitch (p) is the distance – along the pitch line or circle – from any point on a gear tooth to the corresponding point on the next tooth. It is also equal to the circumference of the pitch circle divided by the number of teeth. D. and 24 teeth is 24 Pitch (Tooth Size). 5236 inches Note: Gears of larger circular pitch have larger teeth than gears of smaller circular pitch. 2B BEVEL & MITER GEARS 5-4 GEAROLOGY PRESSURE ANGLE OF CUTTING TOOL (LINE OF ACTION) DIRECTION OF PUSH FROM TOOTH "A" TO TOOTH "B".
11B of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. Backlash may be determined in the tranverse, normal, or axial-planes, and either in the direction of the pitch circles or on the line of action. 11C pitch circles for general comparisons. 11C) Important: The operation of Boston gears at proper center distances assures the correct degree of backlash for greatest efficiency and longest life. GEAROLOGY 4-11 WORMS AND WORM GEARS VELOCITY The velocity of a worm gear or worm is the distance that any point on the pitch circle will travel in a given period of time, 1.