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Knowledge Sharing Issue #6 Enhancing CNC Four-Axis Machine Precision: Calibration Steps and Key Maintenance Guidelines4
https://www.herbao.com.tw/en/ HER BAO MACHINERY CO., LTD.
HER BAO MACHINERY CO., LTD. 1 F., No. 10-59, Yuangang, 2nd Neighborhood, Yuangang Vil., Yuanli Township, Miaoli County 35852, Taiwan (R.O.C.)
  CMM Calibration for 2-Dimensional Motion TablesA Key to High-Quality Precision Positioning In precision manufacturing, rotary positioning tables are extensively used in machine tools, automation equipment, and precision machining processes. The accuracy of a two-dimensional (2D) motion table significantly impacts overall production quality and repeatability.Traditionally, the industry relies heavily on laser measurement systems for calibration. However, in specific high-precision applications, Coordinate Measuring Machines (CMM) offer a more detailed and visual inspection method.  What is a CMM, and why use it? A CMM (Coordinate Measuring Machine) uses contact probes or optical sensors to measure the geometric shape and dimensions of a component. It accurately captures X, Y, and Z coordinate data, effectively measuring flatness, parallelism, hole positioning, depth differences, and other critical geometric features.  Why do we use CMM in addition to laser inspection？ Laser inspection provides rapid and non-contact measurements suitable for quickly detecting overall contour deviations. However, when it comes to pinpointing subtle deviations in specific positions during 2D rotational movement, especially in parallelism or perpendicularity, laser methods alone may not provide sufficient detail.In these cases, the CMM offers another highly effective solution. With its touch probe system, it precisely measures individual coordinate points, capturing detailed data that laser methods might overlook, enabling comprehensive verification of accuracy throughout table movement. Herbao Machinery’s Rotary Table CMM Calibration Procedure Step 1: Equipment Setup and Establishing Reference PointsThe rotary positioning table is firmly mounted on the CMM’s measuring table. Reference points are established to ensure consistent and accurate subsequent measurements.Step 2: Probe Positioning and Initial CalibrationA highly precise measuring probe locates and records the established reference points on the table’s surface, generating an accurate baseline data model.Step 3: Sequential Angle MeasurementThe table is incrementally rotated, typically by 15 degrees per step. After each rotation, the probe measures again, comparing the targeted angle against actual measurement data to verify rotational positioning accuracy.Step 4: Real-time Data AnalysisMeasurement data is instantly relayed to the computer, where software analyzes precision, ensuring parameters such as flatness, perpendicularity, and concentricity remain within permissible tolerances.Step 5: Comprehensive Data ReportingUpon completing all angle measurements, the CMM generates a detailed inspection report, which serves as a key reference for quality control and analysis, ensuring that the rotary positioning tables consistently meet the highest standards.  Real-World Applications The accuracy of two-dimensional motion tables is critical in industries such as high-precision component manufacturing, PCB drilling, semiconductor packaging, and medical device production. For instance, automated alignment and bonding systems operating without stringent calibration may result in slight inaccuracies, significantly increasing production line defect rates.  Conclusion  The introduction of CMM measurement technology not only enhances the reliability of rotary positioning tables but has become a crucial verification method in the precision machining industry. Herbao Machinery employs this technology to effectively ensure equipment quality, providing industry users with increasingly precise and stable solutions.Video Demonstration  Herbao Machinery continues to pursue technological innovation, providing customers with professional and reliable solutions.For technical inquiries or further information, please contact us! https://www.herbao.com.tw/en/hot_515084.html Knowledge Sharing #7 - Rotary Positioning Table Calibration: CMM as an Alternative to Laser Inspection 2025-06-26 2026-06-26
HER BAO MACHINERY CO., LTD. 1 F., No. 10-59, Yuangang, 2nd Neighborhood, Yuangang Vil., Yuanli Township, Miaoli County 35852, Taiwan (R.O.C.) https://www.herbao.com.tw/en/hot_515084.html
HER BAO MACHINERY CO., LTD. 1 F., No. 10-59, Yuangang, 2nd Neighborhood, Yuangang Vil., Yuanli Township, Miaoli County 35852, Taiwan (R.O.C.) https://www.herbao.com.tw/en/hot_515084.html
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Home Information Knowledge Sharing Issue #6 Enhancing CNC Four-Axis Machine Precision: Calibration Steps and Key Maintenance Guidelines [2024-10-21]

Links：https://youtu.be/5HyvbD-D1jU

CNC Machine Four-Axis
Calibration Application

 

 

 The Importance of CNC Machine Calibration 

CNC machining centers are high-precision equipment. Over time and with repeated use, the components of the four-axis machine gradually wear out, leading to reduced accuracy. Regular calibration is crucial to prevent accuracy errors. Precise four-axis calibration ensures that the machine operates in optimal condition, avoiding unnecessary production loss, especially in high-precision machining and large-scale CNC part production.

 

 Calibration Steps 

Without precise four-axis calibration, the operating parameters of the CNC equipment may deviate, impacting product quality. It is recommended to use a dial indicator to calibrate the CNC four-axis machine and follow these steps：

 1  First, calibrate the four-axis base plate and the machine, ensuring the base plate remains parallel to the machine's X-axis.


 2  Next, calibrate the Z-axis level and Y-axis parallel alignment for the top and side of the L-block of both the four-axis rotary table and the tailstock. At the same time, verify the rotational positioning accuracy and repeatability of the four-axis. Use a dial indicator to measure and calibrate at ±90 degrees, ensuring axial accuracy between the four-axis and the machine’s three axes.


 3  After installing the mid-plate, proceed with the calibration of the X, Y, and Z axes at 0°, 90°, and 180°, ensuring the height and center alignment of the four-axis and tailstock, and adjust to achieve the best parallelism and perpendicularity with the machine's three axes for maximum precision.



 Regular Calibration 

A regular CNC machine and four-axis maintenance plan is a key step to extending the life of CNC machines. It helps prevent accumulated deviations that can lead to major machine failures or negatively impact manufacturing quality. Depending on the frequency of operation, calibration is recommended every three to six months. In cases of high-volume production, more frequent calibration is essential.

 Conclusion 

Maintaining machine calibration is not only an important measure for improving manufacturing precision but also a key to extending equipment life and enhancing product quality. Through regular calibration, product defects caused by accuracy errors can be minimized, improving overall production efficiency and customer satisfaction.

 

 Welcome to watch the video for more details. 

 

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