Lennart Hedman

US Patent:

54449154, Aug 29, 1995

Filed:

Feb 9, 1994

Appl. No.:

8/193705

Inventors:

Lennart D. Hedman - Roscoe IL

Assignee:

The Ingersoll Milling Machine Company - Rockford IL

International Classification:

G01C 1502

US Classification:

33293

Abstract:

A target is provided for attachment to a milled locator surface on a machine or to a fixture carrying a part to be machined. A plurality of spaced targets may be used to establish a datum plane. The target has an outer planar flat surface to be engaged by an indicator or used with a laser positioner device. The outer planar flat surface is located at a fixed distance from the milled locator surface, and this distance is usually recorded by indicia on a plate adjacent the indicator or on a cover that covers and protects the target. The outer target surface is parallel to the milled locator surface. To achieve this, the body of the target has inner, planar precisely finished surface that is parallel to the outer planar surface which is on the end of a threaded shaft. The precisely finished, inner planar surface is abutted against the milled surface on the tool or fixture. Anti-backlash springs remove any play from the threaded engagement.