Correcting method of positional error

Abstract

Abstract PURPOSE:To remove a positional error due to the swell or the like of a guide rail by correcting the positional error of a direction rectangular to a prescribed axis in accordance with the current position of the prescribed axis direction. CONSTITUTION:When a movable part is moved in the X axis direction, a positional error shown by an error curve is generated in the Y axis direction due to the swell of the guide rail, a fitting error, or the like. Therefore, the whole strokes of a prescribed axis are divided by a fixed moving distance DELTAl and corresponding relation between each dividing area Ai and the changing variable DELTAPi of the positional error is previously measured and stored in a memory. The prescribed changing variable DELTAPi is read out from the memory in every passage of the movable part through each dividing point and the position of the rectangular direction is corrected by the changing variable DELTAPi. If it is defined that the positional error of the rectangular direction when the movable part is located on an area Ai (i=1, 2,...) is Ei (i=1, 2,...), the changing variable DELTAPi (i=1, 2,...) is expressed by DELTAPi=Ei-Ei-1.

Inventors

• 👤 Mitsuo Kinoshita
• 👤 木下　三男

Bibliographic Details