A large gear measuring system and a method for position alignment and zero calibration

By designing a side-mounted large gear measurement system and a position alignment method, and utilizing an auxiliary centering device and a ball-plate-bolt locking structure, the position alignment problem between the measuring machine and the gear under test was solved, achieving high-precision measurement results.

CN122305997APending Publication Date: 2026-06-30XIAN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN TECH UNIV
Filing Date
2026-04-29
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, it is difficult to achieve high-precision alignment between the measuring machine and the gear being measured in a side-mounted large gear measuring system, which affects the measurement accuracy.

Method used

A side-mounted large gear measuring system is adopted, including a base, a rotary table, an auxiliary centering device, a measuring machine, and a probe. The high-precision alignment between the measuring machine and the rotary table is achieved through the design of the auxiliary centering device and the ball-plate-bolt locking structure. Combined with a multi-step attitude alignment and zero-position calibration method, yaw angle, pitch angle, and roll angle are eliminated.

Benefits of technology

It achieves high-precision alignment between the coordinate system of the measuring machine and the coordinate system of the rotary table, avoiding manufacturing errors and coordinate transformation errors, and improving the measurement accuracy and repeatability of large gears.

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Abstract

This invention discloses a side-mounted large gear measurement system and a method for attitude alignment and zero-position calibration, belonging to the field of coordinate measuring machine (CMM) technology. The system includes a base, a rotary table, an auxiliary alignment device, a measuring machine, a probe, and an L-plate. The auxiliary alignment device is detachably mounted at the center of the rotary table and employs a double-layer support platform, support balls, bearing assemblies, counterweights, support arms, a square ruler, and a ball-plate-bolt locking structure. The measuring machine is equipped with adjustable support feet at the bottom. The method first uses the support balls for fine-tuning to align the auxiliary alignment device with the rotary table axis, then fixes it with the locking structure. Subsequently, it uses the square ruler to eliminate yaw, pitch, and roll angles to complete attitude alignment. Finally, it uses the square ruler reference surface to complete the three-axis zero-position calibration. This invention unifies the measurement and machining benchmarks, reduces coordinate transformation errors, and improves the accuracy, repeatability, and engineering applicability of side-mounted large gear measurement, providing an feasible solution for high-precision measurement of large gears.
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