Chap 5.2 The fundamental law of gearing(11) 5. Backlash(侧隙) r Is there any other factor affected by changing center distance? What is it? Increasing the center distance will increase the backlash Backlash is defined as the clearance between mating teeth measured along the circumference of the pitch circle Is there any problem if there is backlash between the mating gears5. Backlash(侧隙) Is there any other factor affected by changing center distance? What is it? Chap.5.2 The fundamental law of gearing(11) Increasing the center distance will increase the backlash. Backlash is defined as the clearance between mating teeth measured along the circumference of the pitch circle. Is there any problem if there is backlash between the mating gears?