Measuring Device Angle Sensor Kinematic Compensation

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Solution Overview

Problem

Existing measuring devices for in-process measurement of crank pins during machining operations face inaccuracies due to changes in the angular position of the measuring head relative to the test piece, which are not accurately accounted for, leading to measurement errors.

Innovation Solution

Incorporating an angle sensor that operates independently of machine references to detect changes in the angular position of the measuring head, allowing for precise correction of measured values and reducing the impact of kinematic changes caused by wear or adjustments in the linkage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the measuring head is connected via linkage to the base body, then the measuring device can follow the motions of the test piece during machining, but the angular position of the measuring head changes relative to the test piece, causing measurement inaccuracies

Engineering Contradiction:

Improveability to follow test piece motionsVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies feedback by introducing an angle sensor that continuously detects the angular position of the measuring head relative to the test piece. This detected angular position is then used to correct the measured values, creating a closed-loop system where measurement data feeds back into the evaluation process to compensate for kinematic deviations caused by the linkage mechanism.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces reliance on precise mechanical kinematics with a sensor-based detection system. Instead of depending on the linkage mechanism to maintain a fixed angular relationship, the system uses an angle sensor to detect the actual angular position and computationally corrects the measurements, substituting mechanical precision with sensor-based measurement and software compensation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the measuring head angular position changes during measurement, then the measuring device can accommodate kinematic variations, but the measured values no longer correspond to equidistant circumferential locations

Engineering Contradiction:

Improveaccommodation of kinematic variationsVSAvoidcircumferential location accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The angle sensor provides continuous feedback on the angular position of the measuring head. This feedback information is used to calculate correction factors that adjust the measured values, ensuring that they correspond to equidistant circumferential locations on the test piece even when the measuring head angular position varies during the measurement process.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the parameter being measured by introducing angular position detection. Instead of directly measuring circumferential dimensions, the system measures the angular position of the measuring head and uses this parameter to correct the dimensional measurements, transforming the measurement approach from direct dimensional measurement to angular-position-corrected measurement.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If an angle sensor is added to detect angular position changes, then measurement accuracy is improved, but the device complexity increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The angle sensor acts as an intermediary element that bridges the mechanical linkage system and the measurement evaluation system. It provides the necessary information about angular position changes without requiring fundamental redesign of the existing linkage mechanism, serving as a relatively simple additive component that enables accurate measurement correction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9393663B2Measuring device

Publication Date: 2016.07.19 MOVOMATIC SA

AI summary

Measuring device, in particular for in-process measurement of test pieces during a machining operation on a machine tool, in particular a grinding machine, has a measuring head which is movable relative to a base body of the measuring device between a neutral position and a measuring position in which the measuring head is in measuring contact with the test piece. At least one angle sensor is associated with the measuring head for detecting the angular position of the measuring head, in particular changes in the angular position of the measuring head relative to the test piece, during a measuring operation.