Clamping Device Runout Measurement by Rotational Error Isolation
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Solution Overview
Problem
Existing methods for determining concentricity and roundness errors in clamping devices and workpieces are complex and do not accurately isolate the errors of the clamping device itself, often requiring intricate calibration and ignoring potential errors in the tool chuck or holder.
Innovation Solution
A method involving multiple concentricity and roundness measurements taken at different positions, with the clamping device rotated by a predeterminable angle, allows for the calculation of the clamping device's error by offsetting system component errors, using geometric and trigonometric relationships to derive the precise concentricity and roundness error of the clamping device alone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex calibration measurements and calibration bodies are used to determine runout errors of tool holding spindle and adapter element, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and isolates the clamping device's runout error from the total system error by performing separate measurements. First, the runout error of the clamping device alone is measured, then the runout error of the tool holder spindle and adapter element is measured separately. These are determined independently rather than as a combined system, allowing precise identification of each component's contribution to total error.
Solution Approach 2:
The measurement process is segmented into distinct steps: measuring the clamping device separately, then measuring the tool holder spindle and adapter element separately. This segmentation allows each component's runout error to be determined independently and then combined mathematically to get the total system error, simplifying the overall measurement approach.
2Measurement precision
If runout error of tool chuck holding the tool is considered, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by focusing the measurement on specific local components - first the clamping device alone, then the tool holder spindle and adapter element separately. Rather than measuring the entire system as a whole, the runout error is determined locally for each component and then combined, allowing precise identification of which component contributes most to the total error.
Data Source
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AI summary
The invention relates to a method 100 for determining a runout and/or roundness error in a clamping device 4 and a corresponding device 2. The invention also relates to a corresponding method for a workpiece (4'). To determine the runout and/or roundness error in a clamping device 4 or a workpiece (4'), it is provided that a first runout and/or roundness measurement is carried out with the clamping device 4 or the workpiece (4') held in a first measuring position, the clamping device 4 or the workpiece (4') is moved from the first measuring position to a second measuring position, a second runout and/or roundness measurement is carried out with the clamping device 4 or workpiece (4') moved to the second measuring position, and a runout and/or roundness error in the clamping device 4 or the workpiece (4') is determined from the first and the second runout and/or roundness measurements.