Position Measuring Scale Edge Machining for Precision and Bonding
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Solution Overview
Problem
High-precision position-measuring devices face challenges in machining the edges of scales, which can distort the measuring graduation due to microcracks, affecting accuracy and attachment stability, especially in dynamic applications where minimizing mass and space is crucial.
Innovation Solution
The method involves machining the edges of the scale differently to minimize microcracks at the edge bounding the measuring graduation while creating a larger raised ridge at the attachment edge for enhanced bonding, using techniques like sawing, grinding, milling, or laser machining, with specific parameters to control the height and extent of the raised side edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the scale is machined to produce a defined outer contour, then the outer shape and attachment stability are improved, but microcracks and surface distortions occur at the edges affecting measuring graduation accuracy
Solution Approach 1:
The patent applies different machining strategies to different edges of the scale. The first edge (bounding the measuring graduation) is machined with minimal material removal to avoid microcracks and surface distortions, while the second edge (attachment edge) is machined to create a raised ridge for bonding stability. This local differentiation resolves the contradiction by optimizing each edge's machining quality according to its specific functional requirements.
Solution Approach 2:
The machining process is segmented into distinct operations for different edges. The first edge receives a conservative machining approach preserving surface integrity, while the second edge receives aggressive machining to create the raised ridge. This segmentation allows simultaneous achievement of measurement precision and attachment stability without mutual interference.
2Weight of moving object
If the scale dimensions are minimized to reduce mass and space, then weight and footprint are reduced, but the measuring graduation accuracy is affected by edge machining
Solution Approach 1:
The patent minimizes the scale's overall dimensions while protecting the measuring graduation area from machining damage. By applying minimal material removal at the first edge and concentrating the raised ridge creation at the second edge, the design achieves compact dimensions without compromising measurement accuracy in the critical graduation region.
3Stability of the object's composition
If a raised ridge is created at the attachment edge for bonding stability, then attachment stability is improved, but surface roughness and distortions increase near the measuring graduation
Solution Approach 1:
The patent segments the raised ridge creation to occur exclusively at the second edge (attachment edge) through targeted machining operations. This spatial separation ensures that the surface roughness and distortions are confined to the attachment region and do not propagate to the measuring graduation area, simultaneously achieving bonding stability and measurement precision.
Data Source
AI summary
A method for machining a scale of a position-measuring system is provided for such a scale having, on a first surface, a measuring graduation and, on a second surface, is attachable to a carrier body. The first and second surfaces are bounded respectively by first and second edges in a region of a lateral peripheral side edge. The scale is machined to produce a defined outer contour of the scale such that a raised ridge of material is formed at each of the first and second edges. The scale is machined differently at the first edge than at the second edge in such a manner that a dimension of the raised ridge of material at the first edge perpendicular to the first surface is smaller than a dimension of the raised ridge of material at the second edge perpendicular to the second surface.