346 Каталог MAHR 2014 Измерительные инструменты и приборы для линейно-угловых измерений Стр.9-40

Каталог MAHR 2014 Измерительные инструменты и приборы Стр. 9-40 0346 ENG Lab2u

Mahr 9-40 MaraMeter Indicating Measuring Instruments for Internal Measurements Definition of Terms Specifications for inspection and test acceptance procedure of mechanical and electronic caliper gages 1. Basics The inspection only follows approximately the testing methods and procedures of the German standard DIN 878 for dial gages and the testing statements for caliper gages according to VDI VDE DGQ 2618 sheet 12.1 and 13.1. The gages are referred to without special reference as gages for 'absolute' measurements and adjustable zero point. 2. Definitions Definitions of length checking techniques see DIN 2257 part 1 and part 2 (see Illustration). 2.1 Application range Awb Application range Awb of a gage corresponds to the sum of adjusting and measuring range. 2.2.Measuring range Meb The measuring range of an indicating gage represents the range of measuring values in which agreed error limits must not be exceeded. 2.3 Reading Zw The reading Zw of a numerical interval of a numerical scale is the modification of the value of a measured variable that causes the modification of the indication by one interval. The numerical interval corresponds to the scale interval of a line scale and is indicated in the unity of the measured variable. 2.4 Scale interval Skw The scale interval Skw is indicated on the scale i.e. 0.01 mm. It corresponds to the measuring value between two scale graduation marks. 2.5 Deviation within the measuring range fM The deviation within the measuring range (range of deviation) fM represents the distance of ordinates between the highest and the lowest position in the deviation diagram when the movable caliper arm closes. The error limits G for fM is symmetrically positioned to the zero line. The deviation in the partial measuring range ft can only be determined by using electronic testing methods during the preparation of certificates of quality. 2.6 Repeatability fw Repeatability fw is a characteristic value for deviations of the measured variable within the measuring range in the same motion direction of the movable caliper arm (usually n is 5). The limits of error fw are refered to with repeatability limit r. Measuring range Measuring Capacity of Internal Measuring Instruments Data listed in the table referring to groove depth A groove width B and measuring depth L are only meant to be rough guidelines. For each type of instrument there is dependence of these three values from each other and on the application range Awb. This is shown in the adjacent table of examples. For each inside measuring instrument this table is available upon request in conjunction with a detailed data sheet. Application m) (m b wb A e g n a r 10 11 12 13 14 15 16 17 18 19 20 Groove depth A (mm) 0 0 55 0 55 0 56 0 56 0 57 0 57 0 57 0 57 0 57 0 57 0 58 0.5 1.4 55 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 57 1.4 57 1.4 57 1 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 56 1.4 57 1.5 1.4 55 1.4 55 1.4 55 1.4 55 1.4 56 1.4 56 1.4 56 1.4 56 2 1.4 55 1.4 55 1.4 55 1.5 55 1.5 55 1.5 56 1.5 56 2.5 1.4 55 1.5 55 1.5 55 1.6 55 1.6 55 1.6 55 3 1.5 54 1.6 54 1.6 55 1.6 55 1.6 55 3.5 1.6 54 1.6 54 1.6 54 1.6 55 4 4.5 Relationship W L 1.7 54 1.7 54 1.7 53 1.7 54 1.8 54 B Min. groove depth (mm) L Max. usable caliper arm length (mm) Example Awb 12 A 0.5 B 1.4 L 56