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T = p / 2Equations Tooth Parts, 20-and 25-degree Involute Full-depth Teeth ANSI Coarse Pitch Spur Gear Tooth Forms ANSI B6.1a When gears are preshave cut on a gear shaper the dedendum will usually need to be increased to 1.40/P to allow for the higher fillet trochoid produced by the shaper cutter. This is of particular importance on gears of few teeth or if the gear blank configuration requires the use of a small diameter shaper cutter, in which case the dedendum may need to be increased to as much as 1.45/P. This should be avoided on highly loaded gears where the consequently reduced J factor will increase gear tooth stress excessively.b A minimum clearance of 0.157/P may be used for the basic 20-degree and 25-degree pressure angle rack in the case of shallow root sections and use of existing hobs or cutters.c The fillet radius of the basic rack should not exceed 0.235/P for a 20-degree pressure angle rack or0.270/P for a 25-degree pressure angle rack for a clearance of 0.157/P. The basic rack fillet radiusmust be reduced for teeth with a 25-degree pressure angle having a clearance in excess of 0.250/P. Helical Gear. Whole Depthof Tooth40.72.2.2.74643 - 1/20.81.2.2.424.0.1.2 - 3/41.11.1.1.88812 - 1/21.21.1.1.71652 - 1/41.31.1.1.516.0.0.1 - 7/81.60.1.1.28741 - 3/41.70.1.1.20161 - 5/81.90.1.1.11581 - 1/22.00.0.1.02991 - 7/162.10.0.0.98701 - 3/82.20.0.0.94411 - 5/162.30.0.0.90121 - 1/42.50.0.0.85831 - 3/162.0.0.0.81541 - 1/82.0.0.0.77241 - 1/162.0.0.0.78.0.0.15/163.0.0.0.6437.0.0.13/163.0.0.0.5576.0.0.11/164.0.0.0.4725.0.0.5/85.0.0.0.42919/165.0.0.0.3864.0.0.7/167.0.0.0.3003.0.0.3/88.0.0.0.2572.0.0.5/1610.0.0.0.21462/710.0.0.0.19621/412.0.0.0.17162/914.0.0.0.15261/515.0.0.0.0.0.0.12871/618.8496.0.0.

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