Chap 5.2 The fundamental law of gearing(10) 4. Changing Center Distance Conclusion 1. To the gear with an involute form, center distance errors do not affect the velocity ratio for the base circle diameters are unchanging once the gear is cut 2. But the pressure angle is affected by the change in center distance 3. The pitch point and pitch circles are changed4. Changing Center Distance Conclusion： 1. To the gear with an involute form, center distance errors do not affect the velocity ratio, for the base circle diameters are unchanging once the gear is cut. 2. But the pressure angle is affected by the change in center distance. 3. The pitch point and pitch circles are changed Chap.5.2 The fundamental law of gearing(10)