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PH20 ISO10360-2 data compared to PH10

The ISO10360-2 probing test is used to establish whether the CMM is capable of measuring within the stated maximum permissible probing error MPEP by determining the range of distances of the measured points from the centre of the sphere fitted through all the probing points.

Procedure

Measure and record 25 points on the sphere, the following pattern is recommended:

  1. One point on the pole.
  2. Four points equally spaced 22.5o below the pole.
  3. Eight points equally spaced 45o below the pole and rotated 22.5o relative to the previous group.
  4. Four points equally spaced 67.5o below the pole and rotated 22.5o relative to the previous group.
  5. Eight points equally spaced 90o below the pole and rotated 22.5o relative to the previous group.

PH20 sphere 

Derivation of results

Using all 25 measurements compute the Gaussian associated sphere. For each of the 25 measurements calculate the Gaussian radial distance. Calculate the probe error as the range of the 25 Gaussian radial distances.

Requirements

ISO10360-2:2001 test results

All these results use a PH10 mode calibration as inferred calibration has no influence on this test. The PTV* map is active where applicable.

Standard force module

Dia 4 × 12 mm stylus


PH10

Head**

CMM***

Diameter error (mm)

-0.0007

-0.0003

0.0001

Form error (mm)

0.0016

0.0011

0.0010

Dia 6 × 50 mm CF stylus
 

PH10

Head**

CMM***

Diameter error (mm)

-0.0013

0.0000

-0.0002

Form error (mm)

0.0053

0.0020

0.0012


EM2 standard force module

Dia 4 × 12 mm stylus
 

PH10

Head**

CMM***

Diameter error (mm)

-0.0014

-0.0003

-0.0001

Form error (mm)

0.0094

0.0010

0.0018

* Pre-travel variation
** Head touches
*** CMM touches