Renishaw RCU10, Installation And User Manual, Page: 143 / 202

E-4 Commissioning tests

Use the Renishaw XCal-View data analysis software to calculate the accuracy and
repeatability of the machine according to ISO230-2.
Under ideal conditions the accuracy should be 2 ppm ± 5 µm (0.0002 in) or better for both
HS20 and RLE20. The repeatability should be 2.5 µm (0.0001 in) or better.
NOTE: Analysis should be conducted with a full understanding of additional error sources
due to alignment of the XL-80. Errors such as cosine error and Abbé offset error should
be approximated and subtracted from any overall system accuracy value obtained from
XCal-View.
E.1.3 Test 2 – Workpiece thermal expansion compensation
This is a repeat of test 1, with workpiece compensation enabled on both the RCU10
compensation system and on the XC-80 calibration system. This will test that workpiece
thermal compensation is operating correctly.

Set up the XL-80 and XC-80 as described in section E.1.1 on the axis under test.

Ensure that the RCU10 controlling the axis under test has been referenced. This will
automatically activate air refractive index compensation in the RCU10.

Move the axis under test to a position near the axis reference position.

Datum the XL-80 (inputting an offset, if required, to allow the XL-80 and RCU10 to
display the same position).

Open the Configuration screen in RCU CS and select the Parameters tab. Ensure
that a valid value for workpiece expansion compensation has been set in the active
parameter table. Make a note of this value for the axis under test (close the display
screen afterwards).

Activate workpiece compensation for the RCU10 by taking the workpiece
compensation line on the Auxiliary I/O connector low using the machine controller.
Check that the ‘ WP ’ light in the RCU CS Compensation screen is on (this indicates
a successful activation).

Activate compensation on the XL-80 laser by setting the expansion coefficient to the
same coefficient as set in the compensator unit (noted above).

Perform the ISO230-2 test as per test 1, noting the accuracy and repeatability
figures. This test should be compared against the machine's specification, as this is
testing the features of the RCU10 compensation system that are normally used. (If
using structure compensation, repeat the test with structure compensation enabled
to obtain true operational results.)