# US 7,296,331 B2 · Apparatus and method for centering a workpiece on a machine tool

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- Number: US 7,296,331 B2
- Document ID: US7296331B2
- Status: Granted
- Kind: B2
- Application number: 11/668,551
- Filed: 2007-01-30
- Published: 2007-05-31
- Granted: 2007-11-20
- Earliest claimed: 2004-04-22
- Assignees: General Electric Company
- Inventors: Kenneth Edward Mascarenas; James Henry Madge
- Web page: https://patentgrep.com/patent/US7296331B2

## CPC

- B23Q 3/183: {Centering devices}
- Y10T 29/49826: Assembling or joining
- Y10T 29/5109: Lathe
- Y10T 82/2564: Tailstock
- Y10T 409/303752: Process
- Y10T 409/308792: Indexable
- Y10T 409/309968: Tailstock
- B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method is provided for centering a workpiece on a metal shaping machine. First and second guide plates have respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position. At least one spring is engaged with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position. The centering pin is locked in the use position during the operation of the machine on the workpiece.

## Claims

### Claim 1

A method for centering a workpiece on a metal shaping machine, comprising the steps of:
(a) providing first and second guide plates having respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position;
(b) engaging at least one spring with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position; and
(c) locking the centering pin in the use position during the operation of the machine on the workpiece;
(d) wherein the step of locking the centering pin in the use position comprises the steps of:
(i) extending a strap over the top of the centering pin from one radial side to the other; and
(ii) selectively moving the strap between a release position allowing axial movement of the centering pin and a lock position for locking the centering pin in the use position.

### Claim 2 (depends on 1)

A method according to claim 1, and including the step of engaging the centering pin for preventing axial movement of the centering pin beyond a predetermined point relative to the workpiece.

### Claim 3

A method for centering a workpiece on a metal shaping machine, comprising the steps of:
(a) providing first and second guide plates having respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position;
(b) engaging at least one spring with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position; and
(c) locking the centering pin in the use position during the operation of the machine on the workpiece;
(d) wherein the step of engaging at least one spring with the centering pin comprises the step of biasing a centrally-disposed beam of a triple beam spring against the centering pin in the direction of the workpiece for urging the centering pin into the use position.

### Claim 4 (depends on 3)

A method according to claim 3, and including the step of mounting the spring on the first guide plate with the centrally-disposed prong positioned within the perimetrical plane of the first guide plate bore.

### Claim 5

A method for centering a workpiece on a metal shaping machine, comprising the steps of:
(a) providing first and second guide plates having respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position;
(b) engaging at least one spring with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position where the workpiece comprises a turbine engine fan blade; and
(c) locking the centering pin in the use position during the operation of the machine on the workpiece;
(d) wherein the step of locking the centering pin in the use position comprises the steps of:
(i) extending a strap over the top of the centering pin from one radial side to the other; and
(ii) selectively moving the strap between a release position allowing axial movement of the centering pin and a lock position for locking the centering pin in the use position.

### Claim 6 (depends on 5)

A method according to claim 5, and including the step of engaging the centering pin for preventing axial movement of the centering pin beyond a predetermined point relative to the workpiece.

### Claim 7

A method for centering a workpiece on a metal shaping machine, comprising the steps of:
(a) providing first and second guide plates having respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position;
(b) engaging at least one spring with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position; and
(c) locking the centering pin in the use position during the operation of the machine on the workpiece;
(d) wherein the step of engaging at least one spring with the centering pin comprises the step of biasing a centrally-disposed beam of a triple beam spring against the centering pin in the direction of the workpiece for urging the centering pin into the use position.

### Claim 8 (depends on 7)

A method according to claim 7, and including the step of mounting the spring on the first guide plate with the centrally-disposed prong positioned within the perimetrical plane of the first guide plate bore.

### Claim 9 (depends on 8)

A method according to claim 8, and including the steps of:
(a) providing a tip mounting block having an angled inset matching a taper on a front end of the centering pin for being received therein; and
(b) mounting the tip mounting block on an end of the blade for positioning the blade in a fixed position during milling.