ADR-005 split machines from measuring tools on the grounds that they are two
asset classes. It named the metrology population as CMMs, vision systems, wax
trace and Genspect; the plugin was then built against a docstring naming
calipers, micrometers and thread gages. Those are not the same population, and
the difference is the whole decision: bay-mounted capital equipment with a
controlling PC on one side, hand tools in a drawer on the other.
Sixteen months on, measuringtools holds zero rows against 204 machines. The
metrology inventory waiting to be entered is 134 instruments - 35 CMM, 32 form
tracer, 23 vision, 18 wax, 14 measuring, 8 Genspect, 2 eddy, 1 spline - every
one bay-mounted with a controlling PC, and not one hand gage among them. CMM is
already a machinetype, and Part Marker is already a machine while Form Tracer
is a measuring tool, so the line is already drawn somewhere no operator can
predict.
Retires the plugin and the measuring_tool asset type. Calibration is not lost:
it moves onto machines as four nullable columns with status still derived at
read, which is a gain rather than a port because a machine could not record
calibration at all before. ADR-005's one concrete objection - that "show me all
measuring tools" would need an enumeration of type names - is answered with
machinetypes.ismetrology, so it stays a single-column filter.
Taken now because measuringtools is empty. After the 134 rows are entered they
carry relationships, audit history, map positions and collector links, and the
migration stops being a drop.
Scope: product
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