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Knowledge Sharing Issue #3 Understanding Rotational Accuracy - Repeatability and Backlash4
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 2025-05-16 2026-05-16
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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2025-05-16 http://schema.org/InStock TWD 0 https://www.herbao.com.tw/en/hot_515084.html
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Home Information Knowledge Sharing Issue #3 Understanding Rotational Accuracy - Repeatability and Backlash [2024-06-19]

 

 

 

The Science Behind Accurate Positioning

Rotational positioning accuracy plays a crucial role in manufacturing processes. It ensures the alignment accuracy between different machining operations, achieving consistency and coherence in multi-process manufacturing. Precise rotational positioning also reduces material waste and production costs while improving production efficiency and quality control.

 

Unidirectional Positioning Accuracy

Unidirectional positioning accuracy is one of the key parameters in evaluating the performance of a rotary positioning platform. It pertains to the platform's positioning accuracy in a single direction. This concept is measured by rotating from the starting position to the end position, selecting multiple data points along the rotational circumference. High unidirectional positioning accuracy impacts the platform's precision in single-direction tasks such as precise machining, engraving, and cutting. Detailed measurement and analysis of unidirectional positioning accuracy ensure that the platform meets the required precision standards, guaranteeing product quality and efficiency in related applications.

 

Unidirectional System Positioning Error

Unidirectional system positioning error refers to the accuracy of the rotary positioning system in a single direction, considering the error produced during the rotation from the starting position to the end position. When designing and manufacturing rotary positioning systems, it is essential to consider these factors, optimize the design and production processes to minimize unidirectional system positioning errors, and ensure the system meets the expected positioning accuracy requirements during operation.

Unidirectional Repeatability Accuracy

Unidirectional repeatability accuracy refers to the ability of the rotary positioning system to consistently return to the same position in a single direction over multiple positioning operations. This metric measures the system's performance in maintaining accuracy in a specific direction, crucial for applications requiring high consistency and precision.

 

 

Bidirectional Positioning Accuracy

Bidirectional positioning accuracy is a key indicator of the rotary positioning platform's positioning precision, measuring the consistency of the platform's positioning in both directions. It evaluates the platform's accuracy in rotating from the starting position to the end position and then returning from the end position back to the starting position. This ensures the platform can accurately and stably rotate and position in both directions.

 

Bidirectional System Positioning Error

Bidirectional system positioning error refers to the accuracy of the rotary positioning system in both directions, assessing the positioning precision from the starting position to the end position and then returning to the starting position. Errors may arise from various factors, including the mechanical structure's precision, the drive system's performance, and the control system's accuracy.

Average Bidirectional System Positioning Error Range

The average bidirectional system positioning error range indicates the mean value of positioning accuracy in both directions, typically expressed as a range encompassing maximum and minimum positioning errors. This range is calculated based on a series of measurements, covering all possible scenarios from the system's maximum to minimum positions.

Bidirectional Repeatability Accuracy

Bidirectional repeatability accuracy measures the rotary positioning system's ability to return to the same position in both directions consistently over multiple operations. This metric is essential for ensuring the system's reliability and precision in applications requiring accurate bidirectional positioning.

 

 

Backlash

Backlash refers to the gap or play within the rotary positioning system due to the mechanical structure or material properties. This gap allows rotary components to move slightly when changing direction without immediately following the new direction. The presence of backlash causes a delay or lag when the rotary positioning system changes direction until the system fully reacts and follows the new direction.

 

Average Backlash

Average backlash, also known as the mean backlash, indicates the average value of all axial backlashes within the rotary positioning system. This metric is calculated by measuring multiple backlash values and averaging them, serving as an indicator of the overall backlash level of the rotary positioning system. It helps evaluate the system's performance and precision.

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