Sometimes a solution can be a problem. Or so is the story of backlash in CNC machining or machining in general. Backlash is the space between adjoining gear teeth. This space exists to allow the gear mesh without jamming. And to allow lubrication. So, the backlash is the solution to keep the machines from jamming. The more the amount of backlash, the less likely the machine is to jam. And, unfortunately, also the less likely the machine is to be error-free. This space also causes the machine to be inaccurate and unresponsive, increasing wear as loose-fitting moving parts collide together. When the gears are pushing to one side, there is a small clearance in the opposite direction. When you push the gear to the other side, they have to travel this tiny space before they come in contact with touching the other side. While machining, a lot of gears are working together to perform the functions.