THK Linear Motion Slides
The length of the THK linear motion slides is designed according to the movement stroke of the load. The larger the stroke of the load, the longer the length of the required guide rail. Usually the length of the rail is selected after determining that the load needs to travel.
THK linear motion slides length selection method：
1. Some principles of length selection
Under the premise of meeting the required movement stroke, according to the standard length
specified by the manufacturer, this is similar to the stroke selection method of the cylinder. Generally,
linear guides are manufactured according to the length of the factory at the time of shipment, and are cut
at the time of sale according to the length required by the user. A series of screw mounting holes are
designed on the guide rail according to a certain hole pitch. The remaining part of the guide rail needs to
be easily cut out, and the material is saved as much as possible. The length of the guide rail is calculated
according to the model principle.
2. Load direction and carrying capacity
THK linear motion slides The load that mechanical equipment may be subjected to during use: the
compressive load perpendicular to the mounting surface above the slider, we are generally referred to as
the radial load, and the load opposite to this direction is collectively referred to as the reverse radial load,
and the slider The load parallel to the upper mounting surface is commonly referred to as the lateral load.
Only knowledge that masters these length choices can be better applied to the process of purchase and
How to check the accuracy of THK linear motion slides:
1. Basic principles for measuring THK linear motion slides
The measurement basis for the straightness error can be arbitrarily selected, and the evaluation
criteria should conform to the principle of the minimum condition. That is to say, when measuring the
accuracy of the guide rail, two parallel ideal straight lines must be used to accommodate the actual
contour of the tested guide rail and minimize the distance between the ideal straight lines. Then the
distance between the two ideal lines, called the rail containment line, is the straightness error of the
Regardless of how the rating basis translates the principle that the direction of measurement of the
invention award remains the same. The principle is that the measurement direction reflected by the
measurement reading should always be perpendicular to the measurement reference, and the coordinate
distance between the two containment lines should be used. It should not be converted due to the
evaluation reference, causing a slight tilt between the evaluation standards to change direction.
After the THK linear motion slides are only used for several pitches of equal pitch, the horizontal or
other precision angle measuring instruments are used to connect the support points end to end, and
move along the measurement direction to measure the relative level of each gear. The tilt angle of the
selected zero position (measurement reference, horizontal line).
2. Compared with the sliding ball screw, the driving torque is 1/3. There are many balls between the
screw shaft and the nut of the ball screw for rolling motion, so it can get higher motion efficiency.
Compared with the past sliding screw pair, the driving torque is less than 1/3, that is, the power required
to achieve the same motion result is 1/3 of the use of the rolling screw pair.
3. high precision guarantee