measuring tools
abstract
Universal measuring tool is the most widely used measuring tool in machining, which is directly related to the quality of products. The universal measuring tool project is divided into three sub-projects: vernier, micrometer and indicator. Personnel who need verification must have the following knowledge:
1. Each subproject has a large number of verification procedures. In fact, many verification items and verification methods in similar measuring tool regulations are the same, which requires the verification personnel to classify, and what are the requirements for each verification method (standards and instruments to be tested, verification principle, its advantage is to control the errors caused by what factors.
2. The verification of measuring tools involves the knowledge of optical interference and diffraction. How to calculate flatness by interference principle and how to judge the size of light seam by light diffraction.
3. Form and position errors involve the knowledge of flatness, parallelism and verticality, and how to measure and evaluate them.
4. Calibration includes the adjustment of instruments and the selection of measurement benchmarks.
Key points of knowledge
(Need to write the general knowledge points of general measuring tools)
Subproject 1 cursor class
2.9.2. 1 Influence of temperature and linear expansion coefficient on measurement and its correction method.
How to determine the values of flatness and straightness when 2.9.2.2 uses the optical gap method?
Types, technical requirements and verification items of vernier measuring tools in 2.9.2.3
Indication error of 2.9.2.4 vernier caliper measuring tool
2.9.2.5 vernier caliper measuring tool measures the flatness and parallelism of claw.
Basic dimensions of measuring claw of 2.9.2.6 vernier caliper measuring tool
Calculation of internal dimension error of measuring claw of 2.9.2.7 vernier caliper measuring tool edge
Verification of flatness of positioning surface and bottom working surface of 2.9.2.8 depth and height caliper
2.9.2.9 subproject 2 micron measuring tool
2.9.2. 10 What is the difference between the indication errors in the calibration of the measuring block and how to process the data?
2.9.2. 1 1 flatness measurement and calculation based on equal thickness interference principle.
2.9.2. 12 Types, technical requirements and verification items of micro-classification measuring tools
2.9.2. 13 Indicating error of micro-classification measuring tool
2.9.2. 14 Verification of calibration rod of micro-classification measuring tool
2.9.2. 15 Verification of flatness and parallelism of two working faces of measuring rod and anvil and parallelism of large micrometer.
Verification of indication error of lever micrometer
Verification of measurement repeatability of lever micrometer
2.9.2. 18 Verification of indication error of micrometer with range of (0-500) mm
2.9.2. 19 Verification of indication error and variability of internal micrometer and combination size of micrometer head and connecting rod.
Sub-item 3 indicates the table category.
Name, verification items, verification requirements and verification methods of vernier measuring tools in 2.9.2.20.
Name, verification items, verification requirements and verification methods of 2.9.2.21micro-classification measuring tools.
Name, verification items, verification requirements and verification methods of 2.9.2.22 indicating measuring tools.
Types, technical requirements and verification items of measuring tools for indicating instruments in 2.9.2.24.
Indication error of measuring tool in 2.9.2.25 indicator.
Calibration of indication error of 2.9.2.26 inner diameter dial indicator and protection error of positioning bridge
Verification of 2.9.2.27 indicator force measurement.
Verification of Variability of Instrument Indicating Value in 2.9.2.28 Indicating Table
Verification of Return Error of 2.9.2.29 Indicator
The influence of radial force on the indication value of 2.9.2.30 indicator rod.
2.9.2.31How to Verify the Indication Error of Twisted Yellow Comparator and Mechanical Comparator by Pairing Method?
Know very well
Some basic principles that 2.9.2.32 should follow in actual survey.
How to divide the series of 2.9.2.33 parallel flat crystals and the requirements of each series?
Subdivision principle of 2.9.2.34 vernier measuring tool, micro-classification measuring tool and dial gauge measuring tool.
Adjust the correct position of 2.9.2.35 contact interferometer, vertical optical measuring instrument and workbench.
How to choose the measuring cap and adjust the correct position relationship between the headstock and tailstock when 2.9.2.36 uses the length measuring machine.
Where is the smallest error with 2.9.2.37 universal tool microscope?
2.9.2.38's requirements for ring gauges when verifying internal dimension measuring tools.
Understand; Understanding
Working principle of 2.9.2.39 contact interferometer and vertical optical measuring instrument
Working principle of 2.9.2.40 length measuring instrument
Influencing factors of 2.9.2.41measurement uncertainty and how to analyze its uncertainty.
refer to
(1).JJG30-2002 Verification regulation of universal calipers
(2).JJG3 1- 1999 Verification regulation of height caliper
(3) JJF1072-2000 Calibration Specification for Gear Tooth Calipers.
(4) Verification regulation of jjg21-1995 micrometer
(5).JJF 1088-2002 Calibration specification for one thousandth of outside diameter (500mm～300mm)
(6) Verification regulation of JJG26-2001lever micrometer and lever caliper
(7).JJG22-2003 Verification regulation of internal micrometer
(8).JJG427-2004 Verification regulation of micrometer with meter
(9).JJF 109 1-2002 micrometer calibration specification for measuring internal dimensions.
(10). Verification regulation of JG34-1996 indicator (dial indicator and thousandth scale)
(11). jjf1102-2003 Calibration specification for inner diameter gauge.
(12).JJG 35- 1992 Verification regulation of lever instrument
(13).JJG379- 1995 Verification regulation of quality dial indicator.
(14). national defense metrology training textbook-geometric metrology (universal measuring tool)