Dial Indicator Set High-precision Dial Indicator

Item No:MP72450

 

High-precision dial indicator is a precision measuring tool with division value up to 0.001mm. It is mainly used for measuring size, shape and position error with micron precision. It plays a key role in precision manufacturing, metrology calibration and scientific research fields. The following is explained from aspects such as core functions, application scenarios, and typical cases:

1. Core measurement functions

 

1. Ultra-precision size inspection

Linear size measurement: Directly measure the length, diameter, thickness, etc. of the workpiece (such as precision shaft diameter, sheet thickness), and the error range is controlled within ±0.001mm.

Relative size comparison: Match with the standard gauge block, judge whether the workpiece meets the tolerance requirements through the fluctuation of the gauge pointer (for example, testing the diameter consistency of the bearing needle roller).

 

2. Analysis of microscopic shape errors

Roundness/cylindricity: Measure the circumferential profile of precision rotating objects (such as aeroengine shafts, precision bearing outer rings) to capture micron ovality or taper.

Flatness/straightness: Inspect the microscopic undulations of the optical platform and precision mold surface (such as mirror flatness deviation ≤0.005mm).

 

3. Position accuracy calibration

Perpendicularity/parallelism: During the installation of high-end equipment, calibrate the spatial position accuracy of the machine tool guide rail and lithography machine platform (e.g., the parallelism error of the guide rail ≤0.002mm/m).

Coaxiality: Measure the concentricity of axes of multi-section shaft-like parts (such as the coaxiality calibration of robot joint shafts).

 

 

2. Typical application scenarios

(1) Precision manufacturing field

1)aerospace

Measure the size tolerance of the turbine blade tenon (the tolerance zone is always ≤0.01mm) to ensure the assembly accuracy of the blade and the wheel disc; test the flatness of the sealing surface of the engine combustion chamber to prevent high-temperature gas leakage.

 

2)Semiconductor and microelectronics

Test the uniformity of silicon wafer thickness (thickness tolerance ≤0.005mm) and the spacing accuracy of chip package pins (such as QFP package pin spacing ±0.01mm); calibrate the movement accuracy of the lithography machine workbench.

optical element processing

Measure the radius of curvature of the lens and prism (such as the curvature error of the telescope objective lens ≤0.002mm), and the roughness profile of the surface of the optical lens (Ra value ≤0.1μm).

 

(2) Measurement and calibration

1)Verification of standard measuring tools

As a benchmark tool, calibrate the accuracy of measuring instruments such as dial gauges and micrometers (such as using dial gauges to calibrate the indication error of calipers); trace the annual accuracy of standard parts such as gauge blocks and plug gauges.

 

2)Precision laboratory measurement

In the material mechanics experiment, measure the minute deformation of metal specimens when they are stretched (for example, the strain measurement accuracy reaches 0.001mm/100mm); when studying the thermal expansion coefficient of polymer materials, capture the micron-scale size fluctuations caused by temperature changes.

 

(3) High-end equipment maintenance

1)Precision machine tool maintenance

When repairing coordinate grinding machines and slow-moving wire machine tools, check the runout of the main shaft (such as the radial runout of the main shaft ≤0.003mm) and the wear of the guide rail (wear depth ≤0.005mm) to ensure processing accuracy.

2)Medical equipment calibration

Calibrate the mechanical moving parts of CT machine and MRI instrument (such as table translation accuracy ≤0.01mm) to ensure the accuracy of imaging position.

 

 

Key points of use (ensuring accuracy)

1.Environmental control: Use it in a constant temperature (20±0.5℃) and constant humidity (45%-60% RH) environment to avoid temperature fluctuations that cause thermal expansion and contraction of the workpiece to affect the measurement results.

 

2.Probe selection: Replace the probe according to the workpiece material (such as ceramic probes for hard materials and rubber probes for soft surfaces) to prevent probe wear from affecting accuracy.

 

3.Dynamic measurement specifications: When measuring a rotating body, it is necessary to rotate the workpiece at a uniform speed (such as 10- 20r/min) to avoid uneven rotation speed causing meter runout errors; for a vibrating environment, a damping platform is required.

 

 

 

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