Calibration and Monitoring of Inspection Equipment with Gage Blocks
Quality management standards such as EN ISO 9001:2000, TS 16949, etc., demand comprehensive and regular calibration of the measuring instruments used by a company. The VDI/VDE/DGQ guidelines 2618 and calibration guidelines DKD-R 4.3 of the German Calibration Service, which have been accepted in many sectors, form the basis for the execution of calibration of length measurement equipment.
The DKD 4.3 described the required scopes of calibration under metrological aspects, presents possible measuring procedures and mentions suitable standards for the execution of a calibration of inspection equipments. The calibration procedures documented in DKD-R 4.3 are the working basis for each of the DKD laboratories accredited for the calibration of inspection equipment.
The wide-spread VDI/VDE/DGQ guideline 2618 is "the" manual for the practical execution of the appropriate monitoring and measuring tasks in line with the monitoring of inspection equipment. It serves as a working basis for many companies certified to EN ISO 9000:2000 or TS 16949. For the majority of respectable calibration companies, the VDI/VDE/DGQ guideline 2618 is also the basis for the applied test sequences.
As can be seen from the following listing the numbering of the two guideline families is identical. This is the consequence of constructional cooperation between both organizations and a distribution of tasks according to the respective strengths; thus the DKD is responsible for metrologically sensible calibration procedures whereas VDI/VDE/DGQ represents practice-oriented implementation of the calibration procedures.
Frequently the use of gage blocks is recommended, or even compulsory, for the execution of incoming or monitoring inspections and also for the calibration of measurement equipment. The reflects the confidence placed in the metrological characteristics of the gage block, but also proves how practical and effective gage blocks can be when applied in this segment.
Measuring and Inspection Equipment for which Inspection or Calibration by Gage Blocks is Recommended
|Measuring and Inspection Equipment||DKD-R 4.3||VDI/VDE/DGQ Guideline|
|Gage blocks||Sheet 3.1||Sheet 3.1|
|Snap gages||Sheet 4.7||Sheet 4.7|
|Vernier calipers||Sheet 9.1||Sheet 9.1|
|Depth vernier calipers||n/a||Sheet 9.2|
|Height calipers||n/a||Sheetp 9.3|
|Micrometer calipers||Sheet 10.1||Sheet 10.1|
|Micrometer calipers for thread measurements||Sheet 10.2||n/a|
|Dial test indicators||Sheet 10.3||Sheet 10.3|
|Lever calipers for outside measurements||n/a||Sheet 12.1|
|Further guidelines under preparation||-||-|
Applicable SIC Codes: 3423, 3545, 5049, 5084 Applicable NAICS Codes: 332212, 333515, 423490, 423830