Precision of linear rail system is a comprehensive concept, we can know about it from three aspects as follows: walking parallelism, height difference in pairs and width difference in pairs.
Walking parallelism refers to the parallelism error between the blocks and rail datum plane when linear bearing blocks operating on the full length of rails when the linear bearing guide fixed on the datum plane with the bolt.
The height difference in pairs refer to the maximum and minimum height dimensions of linear guide blocks which is combined the same datum plane.
The width difference in pairs refer to the difference between the maximum and minimum width size of each linear guide block and linear guide rail datum plane which is installed on single linear guide rail.
So the precision of linear guide is distinguished from the value of several indicators: dimensional allowance of height H, height difference in pairs if height H, dimensional allowance of width W, width difference in pairs of width W, the walking parallelism of the upper surface of the linear slide block to the lower surface of the slide rail, the walking parallelism of the side surface of the slide block to the side surface of the slide rail, and the linear precision of the length of linear guide rail.
Taking the linear guide rail 1000mm as an example, the precision of the PYG linear guide is the same with HIWIN, which is divided into ordinary C class 25μm, advanced H class 12μm, precision P class 9μm, ultra-precision SP class 6μm, ultra-precision UP class 3μm.
Class C~P linear guides of PYG can fully meet the ordinary mechanical equipment, and class SP and UP linear guides are more suitable for scientific and technological instruments and equipment. Besides , from application point of view, the precision of linear guides also decided by material rigidity, preloading grade and etc.
Post time: Sep-26-2022