What is the radial clearance of a linear guide

The radial radial clearance of the slide rail means that when the track is fixed, the central part of its length is moved, and the slider is moved up and down. At this point the central part of the slider moves in radial direction.
Radial clearance is generally divided into five kinds: ZF micro gap, Z0 zero prepressure, Z1 light prepressure, Z2 prepressure, Z3 heavy prepressure (at this time TBI prepressure expression, brand different, expression will be different, if there is a problem, please consult the Shenzhen ladder Italian Pml Precision Mechanism Ltd customer service). According to the choice of usage, all kinds of clearance values have been standardized.
The radial clearance of slide rail has obvious influence on operation accuracy, load bearing performance and rigidity, so it is very important to choose the gap properly according to the purpose. Generally considering the vibration and impact caused by reciprocating motion, the negative gap, service life and accuracy are all brought back to good effect.