JB/T 3238-1999 This standard is a revision of JB 3238-83 "Coincidence Level". During the revision, only the necessary editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the type and size, technical requirements, marking and packaging of coincidence levels with a graduation value of 0.01mm/m and a graduation range of 0~10mm/m or 0~20mm/m. This standard is applicable to coincidence levels used to measure the horizontal position and small inclination of machine tools and other types of equipment and parts. This standard was first issued in 1983. JB/T 3238-1999 Coincidence Level JB/T3238-1999 Standard Download Decompression Password: www.bzxz.net

ICS25.060.20
Machinery Industry Standard of the People's Republic of China
JB/T3238—1999
Imaging Level Meter
Imaging Level Meter
Published on May 20, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T3238—1999
This standard is revised on the basis of JB3238-83 "Imaging Level Meter". The technical content of this standard is consistent with that of JB3238-83, and it has only been re-edited according to relevant regulations. This standard replaces JB3238-83 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Measuring Tools and Measuring Instruments. The responsible drafting unit of this standard: Shenyang Level Meter Factory. The main drafters of this standard: Yang Bowu and Song Chuang. This standard was first issued in 1983.
Standard of the Machinery Industry of the People's Republic of China
Imaging Levelbzxz.net
Imaging Level Meter
JB/T3238—1999
Replaces JB323883
This standard specifies the type and size, technical requirements, marking and packaging of the imaging level with a graduation value of 0.01mm/m and a graduation range of 0~10mm/m or 0~20mm/m. This standard is applicable to the imaging level used to measure the horizontal position and small inclination of machine tools and other types of equipment and parts. 2
This standard adopts the following definitions.
2.1 Imaging Level
It is a level type level with a base measuring surface, a micrometer screw pair to adjust the bubble of the level relative to the base measuring surface, and an optical principle for imaging reading.
2.2 Graduation value
refers to the inclination of the coincident level when the indexing disk rotates one scale. This inclination is expressed as the ratio of the inclination height to the base with a reference length of 1m, unit: mm/m. 2.3 Zero position
When the coincident level is in a horizontal position, the ideal bubble position (the bubble should be symmetrical with the midpoint of the scale range) is called the zero position. At this time, the image of the level bubble formed by the prism and magnifying glass should be a smooth arc. 2.4 Zero position deviation
The reading value that deviates from the zero position.
3 Type and size
3.1 The type of the combined level is shown in the figure below (the figure is for illustration only and does not show the detailed structure). The micrometer butterfly plate is approved by the State Machinery Industry Bureau on May 20, 1999, and the level bubble is made by the Medical Group on January 1, 2000. The V-shaped T-shaped is implemented on January 1, 2000. JB/T3238-1999
3.2 The basic dimensions of the combined level are that the length of the working surface is 166mm and the angle of the V-shaped groove is 120°. 4 Technical requirements
The working surface of the combined level shall not have rust, bumps, scratches and other defects that affect its use. 4.2
The painted surface should be beautiful, without paint peeling, scratches and other defects, and other exposed non-working surfaces shall not have obvious defects such as rust. 4.3
The micrometer screw should rotate smoothly without getting stuck or jumping. When the micrometer screw rotates evenly, the bubble should move smoothly in the level bubble without stagnation or jumping. 4.4
The scale lines and numbers on the dial and scale plate should be clearly marked, and the bubble image should be clear. The distance from the upper edge of the dial edge to the surface of the indicator disk shall not be greater than 0.5mm. 4.6
4.7 The flatness of the working surface shall not be greater than 0.003mm and shall not be convex. 4.8 The zero position deviation of the working surface shall not be greater than 1/4 of the scale value, and the zero position deviation of the V-shaped working surface shall not be greater than 1/2 of the scale value. 4.9 When the combined image level is deflected 5° around the horizontal axis, the change in its indication shall not exceed 1/2 of the scale value. 4.10 When any "mm/m" scale line on the scale plate coincides with its index line, the non-coincidence between the zero scale line of the 0.01mm/m scale and its index line shall not exceed 10 scale marks.
4.11: The indication error of the coincident level relative to the "zero" scale shall not be greater than 0.02mm/m in the entire measurement range; and shall not be greater than 0.01mm/m in the range of ±1mm/m starting from the "zero" scale. 4.12 The maximum allowable value of the surface roughness R of the coincident level working surface is 0.32um, and the maximum allowable value of the surface roughness R of the V-shaped working surface is 0.63um.
4.13 The hardness of the working surface of the coincident level is 45~50HRC. 5 Marking and packaging
5.1 The coincident level shall be marked with:
a) the manufacturer's name or registered trademark;
b) the graduation value and graduation range.
5.2 The following marks must be on the packaging box:
a) Product name:
b) Manufacturer's name and registered trademark.
5.3 The level should be treated with rust prevention before packaging, and should be well packaged and moisture-proof measures should be taken. 5.4 The level should be accompanied by:
a) Product certificate;
b) Product manual when leaving the factory.
5.5 The packaging box should be packed into a packing box, which should be lined with moisture-proof paper. The space between the packing boxes should be filled with dry and soft materials (such as wood shavings, paper strips, etc.). The outside of the packing box should be sealed tightly to ensure that it can prevent moisture and sand erosion during long-distance transportation or storage. "Handle with care" should be marked on the packing box.
5.6 The warehouse for storing the level should be dry, clean, with moderate room temperature, and the anti-rust effect should be checked regularly. 2
Mechanical Industry Standard
Image Level
JB/T3238—1999
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing: Postal Code 100044)*
1/16 Printing Sheet 1/2 Number of Words 8000
Format 880×1230
First Printing in August 1999
First Edition in August 1999
Print Quantity 1-500
Price 500 Yuan
99-427
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.