Measuring Instruments Commonly Used In The Machining Workshop

DALIAN, China - Nov. 20, 2022 - PRLog -- Classification Of Measuring Instruments

A measuring instrument is an instrument with a fixed form, which is used to reproduce or provide one or more known values. The measuring tools can be divided into the following categories according to their purposes:

1. Single value measuring tool

The measuring tool can only reflect a single measurement value. It can be used to calibrate and adjust other measuring instruments or as a standard quantity for direct comparison with the measured, such as gauge block, angle gauge block, etc.

2. Multivalued measuring tool

It can reflect a group of measuring tools of the same kind. It can also calibrate and adjust other measuring instruments or directly compare them with the measured ones as standard quantities, such as linear ruler.

3. Special measuring tools

A measuring tool specially used to check a specific parameter. Common ones are: the smooth limit gauge for testing smooth cylindrical holes or shafts, the thread gauge for judging the qualification of internal threads or external threads, the inspection template for judging the qualification of surface profiles with complex shapes, and the functional gauge for testing assembly accuracy by simulating assembly pass through, etc.

4. Universal measuring tools

In China, measuring instruments with simple structures are customarily called universal measuring tools. Such as vernier caliper, outside micrometer, dial indicator, etc.

Technical Performance Indexes Of Measuring Instruments

1. Nominal value of measuring tool

The quantity value marked on the measuring tool to indicate its characteristics or guide its use. Such as the size marked on the gauge block, the size marked on the scriber, and the angle marked on the angle gauge block.

2. Graduation value

The difference between the values represented by two adjacent graduation lines (minimum unit measurement value) on the scale of the measuring instrument. If the difference between the values represented by the two adjacent graduation lines on the differential cylinder of an outside micrometer is 0.01mm, the graduation value of the measuring instrument is 0.01mm. The graduation value is the minimum unit value that can be directly read out by a measuring instrument, which reflects the reading accuracy and the measurement accuracy of the measuring instrument.

3. Measuring range

Within the allowable uncertainty, the range from the lower limit value to the upper limit value of the measured value that can be measured by the measuring instrument. For example, the measuring range of the outside micrometer is 0-25mm, 25-50mm, etc., and the measuring range of the mechanical comparator is 0-180mm.

4. Measuring force

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