Question

Difference between backlash and repeatability

Answer 1

backlash is the lost motion when an axis changes direction. The axis in normally driven by a motor and attached to the motor is the position measuring device. The motor drives either a ballscrew or a geared drive to move the axis. If an axis is moved to a position and a clock gauge is set to measure that position, then reverse the axis motion very slowly and using the smallest increment possible to move the axis. Watch the clock gauge, when the clock starts to move the number of increments you have moved the axis is the true lost motion.

Repeatability is the ability of a CNC machine to go to the same place time after time. Say you tlee the machine to move from zero to plus 20mm, set a clock gauge on the axis to measure the position. Now take the axis back to zero and back to 20mm. The clock gause should always be the same reading. If there is lost motion or backlash then the repeatability will be no good

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Answer 2

Repeatability and Backlash

Explanation:

In measurements, repeatability is the ability of the measuring instrument to repeat the same results during the act of measurements for the same quantity.

In mechanical engineering, backlash is a clearance or lost motion in a mechanism caused by gaps between the parts. It is the maximum distance or angle through which any part of a mechanical system may be moved in one direction without applying appreciable force or motion to the next part in mechanical sequence. Backlash is not appreciated in certain applications, while it is desired in some others.