Roundness Measurement Head Alignment for Y-Axis Offset Correction
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Solution Overview
Problem
Existing roundness measuring machines suffer from errors due to offsets in the Y-axis direction between the workpiece and the stylus, which are not adequately addressed by existing technologies, leading to inaccurate measurements.
Innovation Solution
A roundness measuring machine with an attitude adjusting mechanism that includes a Y-axis slider and detector holder, allowing the displacement detector to be adjustable in the Y-axis direction, ensuring accurate contact of the stylus with the workpiece surface by eliminating offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the displacement detector is moved only in X-axis and Z-axis directions, then the device structure is simple, but measurement accuracy deteriorates due to Y-axis offsets between stylus and workpiece
Solution Approach 1:
The patent introduces dynamic adjustability to the displacement detector by adding a Y-axis slider mechanism. This allows the detector to be dynamically repositioned in the Y-axis direction to eliminate offsets between the stylus contact point and the workpiece center, thereby improving measurement accuracy without requiring a completely fixed rigid structure
Solution Approach 2:
The patent transitions from a two-degree-of-freedom motion system (X-axis and Z-axis only) to a three-degree-of-freedom system by adding Y-axis movement capability. This dimensional expansion allows the stylus to reach the exact center point of the workpiece in all three spatial dimensions, eliminating measurement errors caused by Y-axis misalignment
2Measurement precision
If the displacement detector is made adjustable in Y-axis direction, then measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the motion control system into three independent linear axes (X, Y, Z), each controlled by its own slider mechanism. This modular segmentation allows the Y-axis adjustment function to be added independently without complicating the existing X and Z axis mechanisms, making the complexity manageable through functional decomposition
Solution Approach 2:
The Y-axis slider mechanism serves multiple functions: it adjusts the lateral position of the displacement detector to eliminate offsets, enables calibration of the measurement system, and allows compensation for manufacturing tolerances. This multi-functionality justifies the added complexity by providing several benefits from a single mechanism
Data Source
AI summary
A roundness measuring machine includes: a turntable on which a workpiece is to be placed; a displacement detector detecting a displacement of a stylus; a column provided on a base shared with the turntable; a Z-axis slider supported by the column and movable in a Z-axis direction extending vertically; an X-axis slider supported by the Z-axis slider and movable in an X-axis direction intersecting the Z-axis direction; and an attitude adjusting mechanism provided to the X-axis slider and supporting the displacement detector such that an attitude of the displacement detector is adjustable. The attitude adjusting mechanism includes: a Y-axis slider supported by the X-axis slider and movable in a Y-axis direction intersecting the Z-axis and the X-axis directions; and a detector holder supported by the Y-axis slider and supporting the displacement detector such that the displacement detector is turnable around the X-axis direction.