5.4 TESTING.
Where possible a leak test should be carried out on TSA that have been opened.
To do this, temporarily seal the probe cable connector and the free end of the main
cable e.g. with insulation tape. Then apply a 500 mbar vacuum via a suitable adaptor
fitted in the LED blanking plug hole. Once the vacuum has been achieved and the
external vacuum source isolated, the rate of vacuum decay within the TSA should be
less that 5cc/min.
To test for probe and machine tool repeatability a program should be written which
continuously datums a reference tool (or a new tool) and records the updating of the
appropriate tool offset.
The changes in the tool offsets will enable probe and machine tool repeatability to be
defined.
NOTE: The machine’s repeatability should be taken into account when
analysing results. A minimum of 20 readings is necessary to obtain a
satisfactory result.
System repeatability should be checked in all relevant machines axes.
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