Numerical Controller Path Cycle Table Storage Reduction
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Solution Overview
Problem
Conventional numerical controllers using tabular format data for machine tool operations face increased storage requirements due to repeated operations, as reference positions differ for each cycle, leading to excessive data storage needs.
Innovation Solution
A numerical controller design that utilizes a path cycle table to store axial positions relative to reference positions, allowing for reduced data storage by using absolute or incremental values, and calculating movement amounts based on both main tabular format data and path cycle table data to perform operations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tabular format data stores respective axial positions with respect to reference positions for each repeated operation, then the working can be performed with precise position control, but the amount of storage data is greatly increased
Solution Approach 1:
The patent segments the data storage into two parts: a path cycle table that stores only the varying axial positions for each reference position, and the main body data that stores the standard tabular format data. This segmentation allows the system to store only the necessary position variations for repeated operations rather than duplicating entire data sets, thereby reducing storage data quantity while maintaining position control precision.
Solution Approach 2:
Instead of storing complete axial position data for each repeated operation as done in conventional systems, the patent inverts the approach by storing only the differences or variations from a base path. The path cycle table stores positional deviations that need to be applied to the standard tabular data, effectively storing what changes rather than what remains constant, thus reducing storage requirements.
2Manufacturing precision
If the same working is repeatedly performed using conventional tabular format data, then the working precision can be maintained, but the required capacity of the storage means is increased
Solution Approach 1:
The patent creates a simplified copy or representation of the repeated working path in the path cycle table. Instead of storing complete copies of the tabular format data for each repeated operation, the system stores a condensed version that captures only the essential positional variations. This copying approach allows the system to maintain working precision while significantly reducing the capacity requirements of the storage means.
3Reliability
If reference positions are stored for each repeated operation, then the driving control can be accurately performed, but the amount of data to be stored is greatly increased
Solution Approach 1:
The patent segments the reference position data storage by creating a dedicated path cycle table that stores only the reference positions and their corresponding axial positions for each repeated operation. This segmentation separates the reference position information from the main tabular format data, allowing the system to store only the necessary reference position variations without duplicating entire data sets, thereby maintaining driving control accuracy while reducing the amount of data to be stored.
Data Source
AI summary
A path table operation is performed while updating the reference positions. When a read-out command in the path cycle table is read out, the reference positions are withdrawn and reset, and the respective axial positions at the time of the initiation of the path cycle command are stored. From the next period, the target positions are determined by adding the positions at the time of initiation to the respective axial positions corresponding to the reference positions stored in the path cycle table, and a path table operation is performed. A single path cycle table is sufficient for storing commands for portions to be repeatedly worked.