NC Measurement Position Correction by Contact Approach Direction

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Solution Overview

Problem

Existing manual measurement techniques for determining the position of a workpiece in a machine tool are prone to errors due to incorrect specification of the direction of correction of coordinate values, leading to imprecise position determination.

Innovation Solution

A numerical control device with units to acquire start and contact position information, determine the direction of contact, and correct the contact position information to calculate a precise measurement position, thereby automating the correction process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the operator manually specifies the direction of correction of coordinate values, then the measurement process can be completed, but errors occur due to incorrect specification of the correction direction

Engineering Contradiction:

Improveposition determination accuracyVSAvoidcorrection direction specification accuracy

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system automatically determines the correction direction by comparing start position and contact position coordinates, eliminating the need for operator judgment. The numerical control device self-calculates whether to add or subtract the contactor length based on coordinate value comparison, making the system self-correcting and error-proof.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the manual operator judgment process with an automated computational system. The determination unit uses coordinate value comparison algorithms to automatically specify the correction direction, substituting human decision-making with machine-based logical processing to eliminate human error.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If the operator manually corrects coordinate values considering the contactor length and approach direction, then the measurement can be performed, but the operation process becomes complex and time-consuming

Engineering Contradiction:

Improvecontact position accuracyVSAvoidmanual correction operation simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system automatically performs the correction calculation by comparing coordinates and determining the approach direction, eliminating the need for operators to manually consider contactor length and direction. The numerical control device self-completes the correction process that would otherwise require complex manual calculations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The measurement process is divided into distinct automated steps: acquiring start position coordinates, acquiring contact position coordinates, determining approach direction through coordinate comparison, and calculating corrected position. This segmentation allows each step to be automatically processed without requiring operator intervention in the complex correction logic.

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If the operator needs to consider the contactor length and approach direction for correction, then accurate measurement can be achieved, but the measurement process requires more time and attention

Engineering Contradiction:

Improveworkpiece position measurement accuracyVSAvoidmanual measurement process time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the time-consuming manual process of considering contactor length and approach direction with automated coordinate comparison and calculation. The numerical control device instantly determines the correction direction and applies the correction, eliminating the time operators would spend on manual calculations and decision-making.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system automatically handles the entire correction process including determining approach direction and applying the correct offset, eliminating the need for operators to spend time on manual corrections. The numerical control device self-completes what would otherwise be a time-intensive manual process.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250334952A1Numerical control device and computer-readable storage medium

Publication Date: 2025.10.30 FANUC LTD

AI summary

This numerical control device is provided with: a first acquisition unit that acquires start position information indicating the start position at which a contact body starts to measure an object to be measured in manual measurement; a second acquisition unit that acquires contact position information indicating the contact position at which the contact body and the object to be measured come into contact with each other; a determination unit that determines the direction in which the contact body approaches the object to be measured on the basis of the start position information acquired by the first acquisition unit and the contact position information acquired by the second acquisition unit; and a calculation unit that corrects the contact position information on the basis of the direction determined by the determination unit and thereby calculates the measurement position.