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ISO 10360-12:2016 pdf free

ISO 10360-12:2016 pdf free.Geometrical product specifications (GPS)一Acceptance and reverification tests for coordinate measuring systems (CMS)
The principle of 6.3 and 6.4 is to include all of the articulation joints of the articulated arm CMM in a performance evaluation of this part of ISO 10360. The evaluation described in 6.4 includes all articulation joints except the wrist joint assembly, which includes the fifth swivel joint, the sixth hinge joint, and the seventh (if available) swivel joint; the evaluation in 6.3 focuses on the evaluation of this joint assembly. The test procedure is to probe the surface of a test sphere in a manner that extensively articulates the wrist by measuring with five orthogonal stylus orientations articulated at the wrist. For each of the five orientations, the test sphere is probed with five points and a Gaussian (least-squares) sphere centre location is calculated. The set of the five sphere centres, which ideally should have the same coordinates, is used to evaluate the articulated location error, LDia.5×5:Art.
If the articulated arm CMM is equipped with a swivel joint on a seventh axis, the stylus may be rotated by an arbitrary angle between each of the five sphere centre measurements.
If the articulated arm CMM is equipped with multiple styli, e.g. “cluster styli”, then the multiple styli test in ISO 10360-5 should also be performed.
Set up and qualify the probing system on the articulated arm CMM in accordance with the manufacturer’s normal procedures. Choose two locations for the test sphere anywhere in the measuring volume taking into consideration the direction of the stylus during the test (see NOTE 3 of 3.5).
The test sphere and articulated arm CMM shall be mounted rigidly, both individually and with respect to one another, to minimize errors due to bending.
Measure on the test sphere each of the five pole points as shown in Figure 3 a). In this figure, four of the five pole points are placed on four quadrants of an equatorial plane of the test sphere, and the fifth pole is placed on the test sphere so as to be symmetrical with respect to the other four. For each pole point,measure on the sphere four additional points without changing the direction of the stylus or rotating the stylus, as shown in Figure 3 b). For a given stylus direction, the five measured points are spaced approximately evenly over a hemisphere of the test sphere. However, the full set of 25 points may not be evenly distributed over the sphere ([i.e. points from different sets may be close to one another).ISO 10360-12 pdf free.

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