Method for machine tool and profilometer coordinate registration

• US 6,970,766 B2
• Filed: 04/23/2004
• Issued: 11/29/2005
• Est. Priority Date: 04/23/2004
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Wilson, Randall H., Brost, Randolph C., Strip, David R.
• Primary Examiner(s): Picard, Leo
• Assistant Examiner(s): JARRETT, RYAN A
• Application Number:
  US10/830,649
• Publication Number:
  US 20050240302A1
• Time in Patent Office: 585 Days
• Field of Search: 700/159, 700/193, 700/195
• US Class Current: 700/195
• CPC Class Codes: G05B 19/401 characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/37069 Calibrate probe, imitated tool, repeated measurements for different orientations
• CPC Class Codes: G05B 2219/50074 Purpose, workpiece measurement to control, adapt feed of tool

Abstract

A method for registering machine tool and profilometer coordinates, wherein the machine tool defines a C-axis having a zero position, C=0, comprises loading a sacrificial workpiece into the machine tool; cutting several first features in a surface of the sacrificial workpiece and producing a linear machine tool motion across the workpiece; determining the centroid of each first cut feature; fitting a line to the centroids of the first cut features; and measuring angle θ₀ of the line relative to the C-axis zero position. The angle θ₀ is the departure in profilometer coordinates from the C=0 line. The method includes moving the machine tool to a fixed radius; cutting several second features in a surface of the sacrificial workpiece and producing a circular machine tool motion across the workpiece; determining the centroid of each second cut feature; fitting a circle to the centroids of the second cut features; and determining a center of the circle. The center of the circle is the machine tool center in profilometer coordinates.

Claims

1. A method for registering machine tool and profilometer coordinates, said machine tool defining a C-axis having a zero position, said method comprising the steps of:

loading a sacrificial workpiece into the machine tool;

cutting several first features in a surface of the sacrificial workpiece and producing a linear machine tool motion across the workpiece;

determining the centroid of each first cut feature;

fitting a line to said centroids of said first cut features;

measuring angle θ

₀ of said line relative to the C-axis zero position;

moving the machine tool to a fixed radius;

cutting several second features in a surface of the sacrificial workpiece and producing a circular machine tool motion across the workpiece;

determining the centroid of each second cut feature;

fitting a circle to said centroids of said second cut features; and

determining a center of the circle, said center being the machine tool center in profilometer coordinates.

2. A method for registering machine tool and profilometer coordinates, said machine tool defining a C-axis having a zero position, said method comprising the steps of:

loading a sacrificial workpiece into the machine tool;

cutting several first features in a surface of the sacrificial workpiece and producing a linear machine tool motion across the workpiece;

determining the centroid of each first cut feature;

fitting a line to said centroids of said first cut features; and

measuring angle θ

₀ of said line relative to the C-axis zero position.

3. A method for registering machine tool and profilometer coordinates, said machine tool defining a C-axis having a zero position, said method comprising the steps of:

loading a sacrificial workpiece into the machine tool;

moving the machine tool to a fixed radius;

cutting several second features in a surface of the sacrificial workpiece and producing a circular machine tool motion across the workpiece;

determining the centroid of each second cut feature;

fitting a circle to said centroids of said second cut features; and

determining a center of the circle, said center being the machine tool center in profilometer coordinates.