GB/T 8122-2024Bore dial indicator (English PDF)

1 Scope

This document specifies the types and basic parameters, requirements, inspection conditions, inspection methods, marking and packaging of bore indicator gauges:

This document is applicable to pointers and digital instruments with a graduation value or resolution of 0:01mm, 0:001mm and a measuring range of 6mm~1000mm:

Design, manufacture and inspection of internal diameter indicator gauges with display readings:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the latest version (including all amendments) applies to this document:

This document:

GB/T 1219 Indicator

GB/T 17163 Basic terms for geometric measuring instruments

GB/T 17164 Terminology of geometric measuring instruments Product terminology

GB/T 18761 Electronic digital indicator

GB/T 24634 Product Geometry Technical Specification (GPS) General concepts and requirements for GPS measurement equipment

3 Terms and definitions

The terms and definitions defined in GB/T 17163, GB/T 17164 and GB/T 24634 and the following apply to this document:

3:1

The mechanical transmission system is used to convert the linear displacement of the movable probe into the angular displacement of the pointer on the circular disk, and the circular disk is used to read the angular displacement:

Internal dimension measuring instrument:

Note: The graduation value is 0:01mm, which is called the internal diameter dial indicator; the graduation value is 0:001mm, which is called the internal diameter micrometer:

3:2

The mechanical transmission system is used to convert the linear displacement of the active probe into the linear (or angular) displacement of the sensor, and the electronic digital display technology is used to display the linear displacement of the active probe:

An internal dimension measuring instrument that displays the readings:

Note: The digital internal diameter dial indicator has a resolution of 0:01 mm, and the digital internal diameter micrometer has a resolution of 0:001 mm:

3:3 repeatability

When the internal diameter indicator is used to measure the same object multiple times, the indicator swings back and forth (and the movable probe is extended to a fully relaxed state) to find the

When the turning point is reached, the pointer of the indicator (or displayed value) measures the maximum change of the value measured at the minimum turning point multiple times:

3:4

Central error

During measurement, the diameter of the inner diameter indicator is determined by the connection between the movable probe and the interchangeable probe when the positioning bridge is positioned:

The error caused by the diameter:

GB/T 10932 | GB/T 1216 | GB/T 1218 | GB/T 4755 | GB/T 3934 | […]