Gun Tube Erosion and Objective Bore Measurement

Gun tubes degrade with use. Zistos GBIS measures bore diameter across lands and grooves with a self-centering 3-point head and flags a WARNING at 80% of the error limit and CONDEMN at 100%. The decision stays with the operator.

Erosion, pitting and dimensional change at the bore affect accuracy, safety and service life. Barrel condition is a readiness decision, and maintainers need objective data to make condemn or retain calls.

Measuring across the rifling

On the Zistos GBIS Large system, the optional Bore Measurement Kit uses a spring-loaded 3-point contact head. It centers in the bore and spans the rifling for a true diameter reading, accurate to ±0.001 in (0.04 mm), with a typical range of 0.300 in (7.6 mm).

Automatic tolerance flags

• WARNING: the app flags a reading at 80% of the error limit.
• CONDEMN: the app flags a reading at 100% of the error limit.

The decision stays with the operator. The applicable tolerance comes from the government technical manual for each weapon system.

Locating and re-finding features

A built-in sensor reports camera orientation relative to gravity, and calibrated grid overlays scale features on the side camera. Features can be located and found again on the next inspection.

Keeping the record

Settings, depth, angle and measurement are recorded onto the captured image. Readings along the tube export as CSV for trend analysis. For a full life cycle approach, see the SAFEBORE program and the Zistos GBIS page.

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