Table 1: Equations for spur gear chordal tooth thickness. Figure 1: Chordal tooth thickness method.įor spur gears, the formulas to calculate the chordal tooth thickness are detailed in Table 1.įor rack, regardless if they are straight tooth or helical tooth, the formulas are simplified because the gear tooth profile is trapezoid. The thickness is measured at the reference circle as detailed in Figure 1. The chordal tooth thickness measurement method uses a tooth caliper that is referenced from the gear’s tip diameter. For this article, we will discuss chordal tooth thickness measurements. There are three methods for determining this value: chordal tooth thickness measurement, span measurement, and over pin or ball measurement. I n order to determine the tooth size of a gear after taking into account the backlash allowance, you first must determine what the nominal tooth thickness should be.
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