Apparatus and method for determining feedscrew and barrel wear

Details Apparatus and method for determining feedscrew and barrel wear Apparatus and method for determining feedscrew and barrel wear

2006-11-14

2006-11-14

Larkin, Daniel S. (Department: 2856)

Measuring and testing

By abrasion, milling, rubbing, or scuffing

C277S317000, C277S321000

Reexamination Certificate

active

07134316

ABSTRACT:
An apparatus and a method for determining wear of a feedscrew and barrel combination includes a measuring aperture formed in a wall of the barrel, a gage plug releasably retained in the measuring aperture and having an inner end curved to correspond to a curvature of a surface of the central bore surrounding an inner end of the measuring aperture, and a retaining plug releasably retained in the measuring aperture for maintaining the gage plug in place. When the plugs are removed, the gage plug can be measured for barrel wear and a probe can be inserted into the measuring aperture for determining feedscrew wear. A test bar simulating feedscrew wear is used to calibrate the probe.

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