286 Каталог MAHR 2007 Линейно-угловые средства измерений Измерительный инструмент Стр.9-36

Каталог MAHR 2007 Линейно-угловые средства измерений Стр. 9-36 0286 ENG Lab2u

MaraMeter. Indicating Measuring Instruments for Internal Measurements of Terms Specifications for inspection and test procedure of mechanical and electronic caliper gages Definition acceptance 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 page 13. 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 also 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 and is indicated as fMzul. 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). Measuring range Measuring Capacity of Inside Measuring Instruments The data that is shown in the table refer to groove depth A groove width B and measuring depth L these 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 connection with a detailed data sheet. Application range m) (m b Awb 10 11 12 13 14 15 16 17 18 19 20 0 0 55 0 55 0 56 0 56 0 57 0 57 0 57 0 57 0 57 0 57 0 58 )m 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 m( 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 h 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 t p 2 1.4 55 1.4 55 1.4 55 1.5 55 1.5 55 1.5 56 1.5 56 ep d 2.5 1.4 55 1.5 55 1.5 55 1.6 55 1.6 55 1.6 55 e v 3 1.5 54 1.6 54 1.6 55 1.6 55 1.6 55 o or 3.5 1.6 54 1.6 54 1.6 54 1.6 55 Gr 4 1.7 54 1.7 54 1.7 54 4.5 1.7 53 1.8 54 Relationship B L B Min. groove depth (mm) L Max. usable caliper arm length (mm) Example Awb 12 A 0.5 B 1.4 L 56