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Rich bit Klapp 2

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To calculate the theoretical chip thickness, the following formula, which calculates the material removal rate Q'w in the root, must be modified with the sine of the average involute angle (ae x SINα) ae = infeed (depth of cut) in mm vc = cutting or surface speed in m/s vw = workpiece speed in mm/min SINα = averaged involute angle (see Illustration 20) Illustration 19: Averaged involute angle α Example: Calculation of chip thickness of a given gear: 31 teeth, Module 16, pressure angle 20°, helix angle 6.25° Radial infeed ae of 0.15 mm Feedrate vw of 12,000 mm Surface speed 35 m/s SIN of pressure angle 20° = 0.35 Making allowance for the pressure angle of 20°: In the above case, on the involute, the infeed (depth of cut) ae or the feed-rate vw can be increased until a chip thickness of hm 0.5 µm has been achieved