The accuracy levels of linear guide sliders are usually divided according to the following aspects:
Classification by running parallelism
● Ordinary level (no mark / C)
When the guide rail length is 100mm, the allowable running parallelism error of the upper surface of the slider to the lower surface of the slide rail is 5μm.
High level (H): When the guide rail is 100mm long, the allowable running parallelism error is 3μm.
● Precision level (P)
Under this level, when the guide rail is 100mm long, the allowable running parallelism error is 2μm, which is suitable for equipment with high precision requirements, such as general precision machine tools.
● Super precision level (SP)
The allowable running parallelism error is further reduced to 1.5μm, which is often used in fields with extremely high precision requirements such as ultra-precision machining and nanotechnology.
● Ultra-ultra-precision (UP)
This is the highest precision grade. When the guide rail is 100mm long, the allowable value of the parallelism error is only 1μm, which represents the top level of current technology and is suitable for applications where the precision is close to the physical limit, such as high-precision measurement in extreme environments and ultra-precision machining.
Classification by comprehensive precision index
● The dimensional tolerance of height H
Refers to the allowable deviation range between the actual size and theoretical size of the combined height of the slider and the guide rail. The higher the precision grade, the smaller this allowable error.
● The pairwise difference of height H
For multiple sliders installed on the same plane, the difference between their height H has a certain allowable range, and this range also decreases with the increase of the precision grade to ensure the consistency of multiple sliders in the height direction.
● The dimensional tolerance of width W
The dimensional tolerance deviation in the width direction of the slider and the guide rail. The high-precision grade linear guide slider has stricter control on the width dimension to ensure the matching accuracy between the slider and the guide rail.
● Paired difference of width W
The difference between the maximum and minimum values of the width W of multiple sliders installed on the same guide rail must be controlled within a certain range. The higher the accuracy level, the smaller the difference, so as to ensure the installation accuracy and movement accuracy of the slider in the width direction.
● Parallelism of the side surface of the slider to the side surface of the rail
When the slider runs on the rail, the parallelism error between its side surface and the side surface of the rail is also one of the important indicators for measuring accuracy. Different accuracy levels have different allowable ranges for this parallelism error. High-precision linear guide sliders can better ensure the parallelism of the side surface, making the movement smoother and more accurate.
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