1、DEUTSCHE NORM April 199! I I Micrometers Part 2: Fixed micrometers and depth micrometers Concepts, requirements and testing DIN 863-2 ICs 01.040.1 7; 17.040.30 Supersedes June 1981 edition. Prfen geometrischer Gren - Meschrauben - Teil 2: Einbaumeschrauben, Tiefenmeschrauben - Begriffe, Anforderung
2、en, Prfung In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Foreword This standard has been prepared by the Normenausschu Technische Grundlagen (Fundamentals in Technology Stan
3、dards Committee). The DIN 863 series of standards comprises the following: Part 1 : Standard design external micrometers - Concepts, requirements and testing Part 2: Fixed micrometers and depth micrometers - Concepts, requirements and testing Part 3: Special design external micrometers - Designs, re
4、quirements and testing Part 4: Internal micrometers - Concepts, requirements and testing Amendments This standard differs from the June 1981 edition in that the terminology has been harmonized with the relevant international literature l, the flatness tolerance has been changed, a reference temperat
5、ure is now specified, and the standard has been editorially revised. Previous edition DIN 863-2: 1981 -06. Dimensions in mm 1 Scope This standard specifies design, dimensional and performance requirements for and the testing of fixed micrometers and depth micrometers having 0,Ol mm scale intervals o
6、r digital increments and a maximum span of 25 mm. Continued on pages 2 to 5. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No part of this translation may be reproduced without the prior permission of buth Verlag GmbH
7、, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN 863-2 : 1999-0 hl Deutsches Institut fur Normung e. V., Berlin. English price group 07 Sales No. 0107 11.99 Page 2 DIN 863-2 : 1999-04 2 Normative references This standard incorporates, by dated or unda
8、ted reference, provisions from other publications. These norma- tive references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only w
9、hen incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 102 Reference temperatures for measuring instruments and workpieces DIN 1319-1 Basic concepts in metrology - General concepts DIN 1319-2 Basic concepts in metrology
10、 - Terminology relating to the use of measuring instruments DIN 2257-1 Terminology used in dimensional metrology - Units, activities, checking instruments - Metrological concepts DIN EN IS0 3650 Geometrical Product Specifications (GPS) - Length standards - Gauge blocks (IS0 3650 : 1998) l Internatio
11、nal vocabulary of basic and general terms in metrology (VIM), published by the International Organization for Standardization (ISO), 1993.*) 3 Terminology 3.1 Concepts For the purposes of this standard, the concepts defined in DIN 1319-1, DIN 1319-2, DIN 2257-1 and l apply, in addition to the follow
12、ing: 3.1.1 Maximum permissible error Extreme value of an error permitted for micrometers as in this standard (cf. 5.21 in l); in this standard, termed limit of error and designated as G (cf. figure 5). For fixed micrometers, the limit of error G, (see below) applies instead of G. 3.1.2 Extreme value
13、 of an error permitted for micrometers as in this standard, including errors of the spindle, its guide, and of the indicating device. In the case of depth micrometers, the effects of the base are disregarded (cf. figure 5). Designated as G,. Maximum permissible error of measuring head 3.2 Nomenclatu
14、re and dimensions See figures 1 and 2 for nomenclature used in this standard. The designs shown are for illustrative purposes only, but the dimensions shall be as specified. Any deviating dimensions shall be subject to agreement. 4 Designation Designation of a depth micrometer (T) in accordance with
15、 this standard: Micrometer DIN 863 - T 5 Requirements 5.1 Design features 5.1.1 The micrometer shall be held by a cylindrical clamping shank or a threaded cylindrical shank fitted with a locking nut. The shank may be flanged for end-face mounting. 5.1.2 Base for depth micrometers The underside of th
16、e base shall be flat, serving as one of the measuring faces and as support on the measured object. The length, 2, of the base should be either 50 mm or 1 O0 mm. 5.1.3 Spindle The spindle screw thread should have a pitch of 0,5 mm or 1 mm. There shall be no perceptible shake between the spindle and t
17、he nut. The spindle screw thread should be fully engaged in the nut thread over the entire measuring range. The cylindrical part of the spindle should turn easily in its bush, but without any perceptible lateral shake. *) Obtainable from Beuth Verlag GrnbH, Burggrafenstrae 6, D-10787 Berlin. Clampin
18、g shank for fixed micrometers Page 3 DIN 863-2 : 1999-04 The measuring face of fixed micrometers may have any shape, although faces are normally flat or spherical. In depth micrometers, a hole may be drilled through the spindle to receive measuring needles or extension rods. In this case, the rear e
19、nd of the spindle shall have a stop face for needle or rod, as shown in figure 3. The interchangeable needles or rods shall come in series of lengths with graduations of 25 mm and shall have flat end faces. 5.1.4 Spindle locking device If depth micrometers are provided with aspindle locking device,
20、the distance between the measuring faces shall not be altered by more than 2 pm once the spindle is locked. 5.1.5 Ratchet drive If the spindle is driven by means of a ratchet drive, the force exerted by the drive on the measuring face shall be between 5 N and 10 N. 3 4 Fixed micrometer (E) X 2 I I +
21、0,5 1 16-0,2 Detail x (design optional) 6 16-0.2 1 Measuring face 7 Spindle locking device 2 Spindle 8 Barrel 3 Clamping shank 9 Fiducial line 4 Ratchet drive*) 10 Thimble*) 5 Locking nut 11 Digital display 6 Analogue display Spindle locking device and indication at manufacturers discretion. Figure
22、1 : Fixed micrometer (nomenclature) Depth micrometer (T) 1 Needle or extension rod 4 Ratchet drive*) 2 Measuring faces a) For detail X, see figure 1. 3 Base Figure 2: Depth micrometer *) The ratchet screw may either be attached to the back of the thimble or fitted into the ratchet drive. Page 4 DIN
23、863-2 : 1999-04 5.1.6 Scales 5.1.6.1 Thimble The thimble should have a scale with 50 or 1 O0 divisions, with scale intervals of 0,Ol mm. The scale marks shall be cleanly cut. The scale spacing shall be at least 0,8 mm, and the scale mark thickness at least 0,08 mm but no greater than 0,2 mm. If the
24、thimble is bevelled, the angle of the bevel shall be between 1 O“ and 20“ (see figure 4). The distance between the barrel and the thimble surface should not exceed 0,3 mm (see figure 4). 5.1.6.2 Barrel The thickness of the fiducial line and the scale marks on the barrel shall not differ by more than
25、 30 pm from that of the scale marks on the thimble. For micrometers with spindles having a 0,5 mm thread pitch, the 0,5 scale marks shall extend both above and below the fiducial line to clearly distinguish them from the 1 mm marks. 5.1.7 Digital display Digital displays shall be designed so that th
26、e measured value is clearly indicated at any spindle position. 5.2 Materials and measuring faces The micrometer materials shall be selected by the manufacturer as follows: a) The clamping shank of fixed micrometers shall be of steel. b) The spindle, and (for depth micrometers) needle or rod and base
27、 shall be of an alloyed tool steel or equivalent material. Measuring faces may be of hardmetal or another equivalent hard material. Measuring faces shall be lapped and should not have any sharp edges. The hardness of unalloyed steel faces shall be at least 750 HV 5 (about 59 HRC), that of stainless
28、steel faces 575 HV 5 (about 53 HRC). 5.3 Adjusting devices Every micrometer shall be provided with devices to adjust the reading and to compensate for wear of the spindle and nut threads. It shall be possible for the user to operate these devices. 5.4 Setting the reading Manufacturers of depth micro
29、meters set either the zero or the end value. Since a set of needles or rods with different lengths is provided, individual adjustment of depth micrometers for each needle or rod is not neces- sary. Fixed micrometers are normally adjusted after they have been installed. 2 1 i 4 1 Spindle 2 Locking nu
30、t 3 Measuring needle 4 Stop face 3 1 Scale 2 Thimble 3 Barrel Figure 3: Spindle with needle Figure 4: Barrel and thimble design 5.5 Limits of error and tolerances The limit of error GMe shall not exceed 3 pm across the entire 25 mm span when set at any randomly selected reading. For depth micrometer
31、s, the limit of error, G, shall not exceed 1 O pm at any randomly selected reading in the measuring range and for any needle or rod selected from the set. NOTE: Any doubling of limits of error is precluded because the values specified here apply for any setting, including those at an extreme value.
32、Page 5 DIN 863-2 : 1999-04 The actual length of needles or extension rods, when supplied as a set, shall not deviate from the nominal value by more than 7 pm. For fixed micrometers, measuring faces shall be flat to within 0,6 pm. For depth micrometers, the datum face of the base shall be flat to wit
33、hin 2 pm for 50 mm-long bases, and 4 pm for 1 O0 mm-long bases. 5.6 Reference temperature The reference temperature shall be 20 “C in accordance with DIN 102. 6 Testing Since the spindle of depth micrometers is never used separately, only limits of error G need to be checked. On the other hand, for
34、fixed micrometers, only limits of error G, are to be checked. 6.1 Use grade 1 gauge blocks as in DIN EN IS0 3650 to check compliance with the specified limits of error. Gauge block combinations should be selected which permit testing of spindles at points which are integral multiples of the nominal
35、pitch, as well as at intermediate positions. The following series of blocks is suitable (values in mm): 2,5 - 5,l - 7,7 - 10,3 - 12,9 - 15,O - 17,6 - 20,2 - 22,8 - 25. Values obtained at different angles of rotation of the spindle using these blocks can also be used to determine any periodic errors.
36、 Place the gauge blocks against the flat face of an auxiliary element. Then, use the depth micrometer to measure the distance between the faces of the blocks and that of the auxiliary element. It should be noted that deviations from flatness and parallelism of the faces influence the measured result
37、. Limits of error, G, of depth micrometers 6.2 Limits of error G, of fixed micrometers Gauge blocks (e.g. as specified in subclause 6.1) or other suitable material measures shall be used together with auxiliary devices to check G,. 6.3 Flatness of measuring faces Check the flatness of measuring face
38、s by means of an optical flat positioned so that the number of interference rings or bands is as small as possible, or there are closed rings. 7 Marking Micrometers complying with this standard shall be legibly and permanently marked with the following informa- tion: - scale interval or digital incr
39、ement; - measuring range; - manufacturers trademark or name. In addition, each set of measuring needles or rods for depth micrometers shall be marked. t 5 C i O .- L i Limit of error Maximum error . X X X X -3 -2 1 Limit of error I 1 I I I I I 1 1 I O 2,5 5.1 1,l 10,3 12,9 15 17,6 20,2 22,8 25 Length of gauge block, in mm -5 I - Figure 5: Limits of error for a micrometer with a measuring range of O mm to 25 mm, set at zero
