技術資料
TECHNICAL DATA
When using linear guides for linear guidance, the rolling friction characteristic of these guides not only reduces the coefficient of friction to 1/50th that of sliding guides but also minimizes the difference between dynamic and static friction. Consequently, no slippage occurs during table operation, enabling positioning accuracy in the micrometer range.
Traditional sliding guides inevitably suffer from poor platform motion precision due to oil film backflow. Insufficient lubrication during motion leads to wear on the contact surfaces of the running tracks, severely affecting precision. In contrast, rolling guides exhibit very minimal wear, allowing the machine to maintain precision over the long term.
Since the friction during the movement of linear guides is very low, only a small amount of power is needed to operate the machine bed. This is particularly evident when the machine bed operates in frequent back-and-forth cycles, significantly reducing the machine’s power consumption. Furthermore, because the heat generated by friction is minimal, they are suitable for high-speed operation.
Due to the special clamping structure design of linear guides, they can withstand loads in the up, down, left, and right directions simultaneously. This is unlike sliding guides, which can only withstand light lateral loads in the direction of the parallel contact surfaces, a limitation that can easily lead to poor machine operational accuracy.
During assembly, simply mill or grind the mounting surfaces of the guideways on the machine bed, then follow the recommended steps to secure the guideways and sliders to the machine with the specified torque to reproduce the high precision achieved during machining. With traditional sliding guides, the running ways must be scraped, which is both labor-intensive and time-consuming; furthermore, if the machine’s accuracy deteriorates, the scraping process must be repeated. Linear guides are interchangeable; by replacing the sliders, rails, or even the entire linear guide assembly individually, the machine can regain high-precision guidance.
If a sliding guide is under-lubricated, direct metal-to-metal friction at the contact surfaces will cause wear on the machine bed. However, ensuring adequate lubrication for sliding guides is not easy, as it requires drilling holes in appropriate locations on the machine bed to supply oil. Linear guides, on the other hand, are equipped with grease nipples on the sliders, allowing grease to be injected directly with a grease gun. Alternatively, dedicated oil tube fittings can be installed to connect to a lubrication line for automatic lubrication via an automatic lubricator.