Video measuring machine ISO

video measuring machine ISO 

The main factors affecting the accuracy of video measuring machine are precision indication, structure principle, measurement method, daily neglect of maintenance and so on. In 1994, China implemented the International Acceptance Test and Re-inspection Quantity of Coordinate Measurement. The details are as follows:

Part 1: Coordinate measuring machines for measuring linear dimensions;

Part 2: The coordinate measuring machine with the axis of the turntable as the fourth axis;

Part 3: Scanning CMM;

Part 4: Coordinate measuring machine of multi-probe detection system;

Part 5: Error evaluation of calculating Gauss auxiliary elements. In any seven different directions of measurement space, a group of five size blocks are measured. Each block length is measured three times. All measurement results must be within the prescribed MPEE value range.

Maximum Permissible Detection Error (MPEP): 25-point measurement precision standard ball, uniform distribution of detection points. The maximum allowable detection error MPEP is the maximum of all measurement radius.

ISO 10360-3 (2000) "Coordinate Measuring Machine with Fourth Axis of Turntable": For a measuring machine equipped with a turntable, the measurement error of the measuring machine is defined in this part. It mainly includes three indicators: radial four-axis error (FR), tangential four-axis error (FT), and axial four-axis error (FA).

ISO 10360-4 (2003) "Scanning CMM": This part is suitable for CMM with continuous scanning function. It describes the measurement error in scanning mode.

Most measuring machine manufacturers define "space scanning detection error in THP case". In addition to THP, the standard also defines scanning detection errors in THN, TLP and TLN cases. 沿标准球上4条确定的路径进行扫描。 The maximum allowable scanning detection error MPETHP is the maximum difference of all scanning radius. THP illustrates the scanning characteristics along the known path at the point with the highest density. Note: The description of THP must include the total measurement time, for example: THP = 1.5um (scan time is 72 seconds).

ISO 10360-4 further explains the following definitions:

TLP: Scanning at low density points along a known path.

THN: Scanning along an unknown path with a high density point.

TLN: Scanning along an unknown path in a low-density manner.