Trajectory Measuring Device for Multi-Axis CNC Interference
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Solution Overview
Problem
In machines with three or more feed axes, measuring trajectory errors is time-consuming and often hindered by interference and insufficient movable range, especially when evaluating trajectories on multiple planes.
Innovation Solution
A trajectory measuring device that calculates moving trajectories on each plane using command conditions, including inter-axis phase differences, to efficiently measure trajectories by generating command and feedback signals for the axes, allowing for simultaneous measurement across multiple planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If trajectory errors are measured on multiple planes in machines with three or more feed axes, then measurement completeness is improved, but measurement time increases significantly
Solution Approach 1:
The patent combines measurements on multiple planes (XY plane, YZ plane, XZ plane) into a single integrated measurement process. By using three feed axes simultaneously with coordinated motion commands, the system captures trajectory data for all three planes in one execution, rather than performing separate measurements for each plane as in conventional methods.
Solution Approach 2:
The measurement system achieves multi-functionality by using the same three feed axes to perform measurements on multiple planes simultaneously. The control device generates coordinated command signals that enable the feed axes to execute complex spatial trajectories that project onto multiple planes, allowing one measurement operation to serve multiple measurement purposes.
2Area of stationary object
If machines move in wide ranges to measure large command radius trajectories, then measurement coverage is improved, but interference among machines occurs and movable range becomes insufficient
Solution Approach 1:
The patent transitions from measuring trajectories on individual two-dimensional planes separately to utilizing three-dimensional spatial coordination of multiple feed axes. By commanding coordinated motion along three axes simultaneously, the system measures trajectories on multiple planes through a single three-dimensional motion, effectively using the third dimension to resolve conflicts between measurement coverage and physical interference constraints.
3Measurement precision
If separate machining programs are executed for each measuring plane, then trajectory evaluation accuracy is improved, but productivity decreases
Solution Approach 1:
The patent merges multiple separate measurement operations into a single integrated measurement execution. The control device processes and coordinates command signals for all three feed axes simultaneously, enabling the system to evaluate trajectories on XY, YZ, and XZ planes through one unified measurement run, thereby maintaining comprehensive evaluation accuracy while eliminating the need to execute separate programs for each plane.
Data Source
AI summary
A trajectory measuring device that measures a moving trajectory of a moving target in a machine including three or more movable axes for the moving target, the trajectory measuring device including a trajectory calculating unit that calculates, for each plane having two movable axes among the movable axes as coordinate axes, the moving trajectory on the plane by using command conditions to the moving target including an inter-axis phase difference among the movable axes, command signals to the movable axes generated on the basis of the inter-axis phase difference, and feedback signals indicating positions of the movable axes at time when the movable axes are feedback-controlled such that the positions of the movable axes follow the command signals.