Specifications

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Southwestern Industries, Inc.
TRAK LPM Programming, Safety, & Operating Manual
5.4 Absolute and Incremental Reference
The ProtoTRAK PMX CNC may be programmed and operated in either (or in a
combination) of absolute or incremental dimensions. An absolute reference from which
all absolute dimensions are measured (in DRO and program operation) can be set at any
point on or even off the workpiece.
To help understand the difference between absolute and incremental position, consider
the following example:
Each point has both an absolute and an incremental reference in the X-axis. The
ProtoTRAK PMX CNC allows you to program using either.
5.5 Referenced and Non-Referenced Data
Data is always loaded into the ProtoTRAK PMX CNC by using the INC SET or ABS
SET key. X, Y, Z positions are referenced data. In entering any X, Y, or Z position data,
you must note whether it is an incremental or absolute dimension and enter it
accordingly. All other information (non-referenced data), such as tool diameter, feedrate,
etc. is not a position and may, therefore, be loaded with either the INC SET or ABS SET
key. This manual uses the term SET when either INC SET or ABS SET may be used
interchangeably.
5.6 Incremental Reference Position in Programming
When X, Y, Z RAPID and Z data for the beginning position of any event are input as
incremental data, this increment must be measured from some known point in the
previous event. Following are the positions for each event type from which the
incremental moves are made in the subsequent event:
Position: X, Y and Z programmed
Drill: X, Y, Z RAPID, and Z END programmed
Bolt Hole: X CENTER, Y CENTER, Z RAPID and Z END programmed
Mill: X END, Y END, Z RAPID and Z END programmed
Arc: X END, Y END, Z RAPID and Z END programmed
Circle (POCKET or FRAME): X CENTER, Y CENTER, Z RAPID and Z END
programmed