When β = γ = At 15 °, the tooth surface errors of discrete points on the concave and convex surfaces of helical gear are shown in Figure 1. The tooth surface error of the discrete points on the working tooth surface of the concave surface fluctuates around 0 mm, and the fluctuation range is very small. The error of the discrete points on the transition tooth surface is large due to undercutting; The tooth surface error range of discrete points on the convex surface is – 0.011~- 0.017 mm.
β = γ = At 25 °, the tooth surface error of the discrete points on the concave and convex surfaces of helical gear is shown in Figure 2. The tooth surface error of the discrete points on the concave surface is β = γ = The tooth surface error of discrete points on the concave surface is close at 15 °; The tooth surface error of discrete points on the convex surface is – 0.004~- 0 010mm。
Therefore, when β = γ = 15 ° and β = γ = At 25 °, compared with the theoretical tooth surface, the absolute value of the concave tooth surface error is close to 0, but the absolute value of the convex tooth surface error is larger.