Method and apparatus for positioning using circular interpolation
US4493032A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1982 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Sep 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/4103
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus are disclosed for providing very precise incremental motion of a numerically controlled machine tool, or other similarly controlled object, along a circularly arced path. For a mutually perpendicular X and Y coordinate system, X and Y indices are determined based on certain prescribed input information related to the parameters of the circular path and the relative rate of motion between the machine tool and the workpiece, and on immediate, continuously recomputed, coordinates of the tool or object. The indices are each scaled by a modulus related to the radius of the arc to generate incremental distances .DELTA.X and .DELTA.Y according to which the next move is to be made. The process is reiterated until the desired circular path is complete. In both method and apparatus, only integer values of .DELTA.X and .DELTA.Y are used for implementing each increment of motion. Non-integer values are carried forward to the next iteration of the process to prevent error accumulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.