Profile Shift or Addendum Modification - x The angle that a helical gear tooth makes with the gear axis at the pitch circle unless otherwise specified. Most spur gears are cut to operate at pressure angles of 20 or 25°. Standard Pressure Angles are established in connection with standard gear-tooth proportions. The angle between a tooth profile and a radial line at its pitch point. The condition for no undercutting in a standard spur gear is given by the expression: Normal Diametral Pitch is the diametral pitch as calculated in the normal plane and is equal to the diametral pitch divided by the cosine of the helix angle. The ratio of the number of teeth to the number of inches of pitch diameter - equals number of gear teeth to each inch of pitch diameter. The English module is a ratio of the pitch diameter in inches to the number of teeth. Ordinarily, module is understood to mean ratio of pitch diameter in millimeters to the number of teeth. Ratio of the pitch diameter to the number of teeth. ![]() Use the Gear dialog box to enter specific values for a gear for DIN or ANSI.
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