Micro-guideway installation calibration is essential for ensuring equipment accuracy. If calibration is not performed after installation, issues such as sliding friction, sticking, and positioning errors may occur, directly affecting machining precision. Calibration focuses on three key indicators: guideway flatness, parallelism, and straightness. These must be controlled within ±0.01 mm using professional instruments and step-by-step adjustments. The detailed procedure is as follows:
1.Establish a Reference and Prepare the Mounting Surface:
Ensure that the mechanical reference surface on which the guideway is mounted is straight and clean. Use precision levels, granite surface plates, or coordinate measuring machines to inspect and verify that the flatness and straightness of the mounting surface meet the required standards.
2.Tighten Bolts Step by Step:
After positioning the guideway, tighten the mounting bolts gradually in sequence-for example, alternating from the center outward toward both ends. This prevents deformation or twisting caused by installation stress and ensures that the guideway naturally conforms to the reference surface.
3.Use a Lever Dial Indicator to Check Straightness:
Fix a magnetic indicator base on the carriage, and position the lever dial indicator so its probe contacts a reference surface of known accuracy. Move the carriage manually through its full stroke while observing the indicator readings. Adjust individual mounting bolts locally to correct any straightness errors.
4.Check Parallelism:
When installing two guideways in parallel, use the first guideway-after its straightness is confirmed-as the reference. Measure the distance between corresponding points on the two guideways using gauge blocks, feeler gauges, or a dial indicator. Ensure that parallelism across the entire length stays within the allowable tolerance.
5.Use Professional Optical Tools for High-Efficiency Calibration:
For ultra-high-precision or long-travel applications, it is recommended to use optical measuring instruments such as autocollimators or laser interferometers. These tools offer far greater accuracy and efficiency than mechanical instruments, directly measuring and generating data on guideway straightness, pitch, yaw, and other error components to guide precise adjustments.
6.Preload Adjustment and Final Tightening:
After calibration, check and adjust the carriage preload according to design requirements. Finally, use a torque wrench to tighten all mounting bolts to the specified torque in the correct sequence. Recheck accuracy to ensure that no new deformation has been introduced during the tightening process.
After completing static calibration, operate the guideway back and forth along its full stroke under load. Once the run-in is complete, re-measure the key accuracy indicators to confirm that the precision remains stable and compliant under actual working conditions.
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