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1、JAPANESE INDUSTRIAL STANDARD Precision levels JIS B 7 5 1 0 - 1 9 9 3 Translated and Published bY Japanese Standards Association UDC 532.29 Printed in Japan 7s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
2、Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,- In the event of any doubt arising, the original Standard in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1
3、111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,- UDC 532.29 JAPANESE INDUSTRIAL STANDARD J I S Precision levels B 7510-1993 1. Scope This Japanese Industrial Standard specifies the precision levels (1 of which
4、length of measuring face of one side is from 150 mm to 300 mm (hereaf- ter referred to as “levels“). Note (I) An indicating instrument to measure the minute inclination from horizontal or vertical, using a precision bubble tube, by directly reading the displacement of its bubble on the graduation of
5、 the bubble tube. Remarks: The standards cited in this Standard are given in the following: JIS B 0601 JIS B 7513 JIS B 7538 Autocollimators JIS Z 8103 Surface roughness - Definitions and designation Precision surface plates Glossary of terms used in instrumentation 2. Definitions JIS Z 8103 apply,
6、and the rest of the terms shall be as given in the following: For the purposes of this Standard, main definitions given in (i) flat level (2) square level The level of which bubble tube is being built in a square bar shaped structural body, and its bottom is used as the measuring face. equal quadril
7、ateral frame shaped structural body, and the four faces of periphery are used as the measuring faces respectively. the bubble of the main bubble tube to displace by one graduation, and it is expressed by a height (pm in unit) or angle (second in unit) in respect to 1 m of bottom side. The level of w
8、hich bubble tube is being built in a side of an (3) sensitivity The sensitivity of a level is the inclination required to allow Informative reference: The relation between the angle and the height in respect to the bottom side shall be as follows: Angle 1 second = 4.85 pm per 1 m = 5 pm per 1 m 3. p
9、arts of the levels shall be in accordance with Fig. 1. Names and symbols of respective parts The names and symbols of main Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo rep
10、roduction or networking permitted without license from IHS -,-,- 2 B 7510-1993 Fig. 1. Names and symbols of respective parts Flat level Square level Sub-bubble tube Main bubble tube ff 1 Bottom face (measuring face) 1 L A P ! k 1 4 ,-Sub-bubble tube ,-Main bubble tube Upper face (measuring face) Lb2
11、_i 1 (measuring .faca) Bottom face (measuring face) c 1 Remarks: These figures shall be for indicating the names and symbols of respective parts only, and shall not be for indicating the standard of structure and shapes. 4. Classification and grades 4 . 1 Classification to sensitivities as given in
12、Table 1. The levels shall be classified into three classes according Table 1. Sensitivities of levels Class Sensitivity (mmm) Class 1 0.02 (i U - z h al c, !5 E - a a l .C - ., - a Y c b a 5 b C m a o cm B v) h Y m Copyright Japanese Standards Association Provided by IHS under license with JSALicens
13、ee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,- 8 B 7510-1993 I X Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing,
14、Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,- 9 B 7510-1993 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 M
15、DTNo reproduction or networking permitted without license from IHS -,-,- 10. B 7510-1993 9. Inspection formances, shape and dimensions, structure, and appearance, and the results shall conform to the requirements of 5., 6. and 7. The inspection of the levels shall be carried out on the per- 10. Desi
16、gnation title of standard or standard number, distinction of flat type and square type, class (sensitivity), designation, and grade. Example 1. Precision level Flat type Class 1 200 GradeA Example 2. JIS B 7510 Square type Class 2 300 Grade B The designation of the levels shall be in accordance with
17、 the Marking The body of level shall be marked with the following informa- Class (sensitivity) Grade Manufacturers name or abbreviation Precautions for handling In handling the level, attention shall be paid on the following matters: The measuring face of the level shall be protected carefully, and
18、prior to use, confirmation shall be made that it is free from burr and rust. Care shall be taken on the position of the centre of the bubble of the level. Prior to use, it shall be confirmed that no difference exists between the reading, when the level has been placed on a surface plate, and the rea
19、d- ing, when it has been reversed by 180“. When any difference between these readings exists, it shall be adjusted rightly by the adjusting screw of the zero point adjusting device. The length of the bubble is sensitive to the temperature change. Particu- larly the change in length of bubble due to
20、the temperature change during measuring results in the measurement error directly, so that in carrying the level care shall be taken on its thermal insulation. For the purpose of carrying out the correct reading by the level, the mean value of the indication values at the both ends of the bubble sha
21、ll be obtained without fail. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7510-1993 Edition 1 Japanes
22、e Text Established by Minister of International Trade and Industry Date of Establishment: 1955-12-16 Date of Revision: 1993-04-01 Date of Public Notice in Official Gazette: Investigated by: 1993-04-30 Japanese Industrial Standards Committee Divisional Council on Precision Machinery This English tran
23、slation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1994 Printed in Tokyo by Hohbuneha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 07:22:35 MDTNo reproduction or networking permitted without license from IHS -,-,-