If a straight bevel gear is cut by a Gleason straight bevel cutter, the tooth angle should be adjusted according to : Table 5.6 Equations for chordal tooth thickness of standard straight bevel gears Table 5.5 Equations for chordal tooth thickness of Gleason straight bevel gearsįig.5.2 Chart to determine the tooth thickness factor k for Gleason straight bevel gear Table 5.7 the same of a Gleason spiral bevel gear. Table 5.6 shows the same of a standard straight bevel gear. Table 5.5 shows the equations for chordal tooth thickness of a Gleason straightīevel gear. Table 5.4 Equations for chordal tooth thickness of helical gears in the transverse system Table 5.3 Equations for chordal tooth thickness of helical gears in the normal system Table 5.4 presents the equations for chordal tooth thickness of helical gears in the transverse system. Helical gearsshould be measured on the normal plane basis as shown in Table 5.3.
NOTE : These equations are also applicable to helical racks. Table 5.2 Chordal tooth thickness of racks The governing equations become simple since the rack tooth profile is trapezoid, as shown in Table 5.2. Table 5.1 Equations for spur gear chordal tooth thickness Table 5.1 presents equations for each chordal tooth thickness measurement. Thickness is measured at the reference circle. This method employs a tooth caliper that is referenced from the gear’s tip diameter. There are direct and indirect methods for measuring tooth thickness.