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The reference UCS (REF) defines the reference point and reference axes direction for the whole posting process. All other UCS's and tool points are defined relative to REF.
The REF UCS must correspond to the "zero" UCS for the machine. The operation of GPP2 assumes that zeroing all machine axes will result in the tooltip positioned at the REF UCS origin, with the tool aligned with the REF UCS Z axis.
The REF UCS is determined by the user at post-time, in the Cimatron PP interaction. Currently, there are several ways to define the REF UCS:
NC file setup UCS - this is the simplest way, but is also very rigid, since that UCS cannot be modified in an NC file after it is created.
The first procedure UCS.
Any UCS selected by the user. This option is available starting with Cimatron version 7.2 patch 4. It should become the major method of specifying the REF UCS.
Inside GPP2, there are no EX2 system variables that specify REF. It is simply not required. The REF zero point is, by definition, (0,0,0), and its orientation axes are similarly known: X is (1,0,0), Y is (0,1,0) and Z is (0,0,1). Everything else is measured in reference to this UCS.
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