Path control apparatus for the computer directed control of a numerically controlled machine tool

US4214192A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gunter Bromer · Spardorf, DE
• Horst Gose · Erlangen, DE
• Klaus Hoffmann · Bad Tölz, DE
• Christian Seeliger · Erlangen, DE

Key dates

• Filing date: Dec 20, 1977
• Grant date: Jul 22, 1980
• Expiry date: Dec 20, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B19/371
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In path control apparatus for a numerically controlled machine tool, a computer determines the trajectory to be traversed in space, resolves the latter by way of interpolation into the axial increments of the individual feed axes and performs complete position control for each axis. The interpolation is accomplished by the method of direct function computation, using travel distance increments proportional to the trajectory velocity. The position control is designed as a discrete control and operates with the premise that the minimum total computing cycle time is shorter than the sampling time of the fastest position control loop required by the control system.