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A.3 Profile Geometry Programming (PGP) Syntax
Profile geometry programming is used to programme profiles using simple geometric elements such as line segments
and arcs without defining any connecting points between them.
Profile geometry programming
- uses ISO programming instructions plus its own special instructions,
- is only used in programming with absolute dimensions (G90),
- is used in one of the three planes defined by functions G17, G18 and G19 (the axes outside this plane can be
programmed in ISO).
A profile definition sequence written in PGP:
- is comprised of blocks whose end points are calculated by the system in accordance with the elements in the
previous blocks (two blocks maximum),
- ends by a block whose end point is completely defined.
The following table summarises the instructions used by profile geometry programming for sequences in the XY plane
(G17).
To programme sequences in:
- the YZ plane (G18), replace X, Y, I and J by Y, Z, J and K,
- the ZX plane (G19), replace X, Y, I and J by Z, X, K and I.
The following symbols are used in the drawings in the table:
point completely defined,
point calculated by the system,
point defined or calculated.
End point of a line segment (end of PGP sequence)
Y
X
XY
EA-..
XY
EA+..
Syntax: N.. [G00/G01] EA.. X.. Y..
End point of an arc (end of PGP sequence)
Y
X
XY
XY
R
IJ
Syntax: N.. [G02/G03] X.. Y.. (I.. J.. or R..)
Line segment defined by an angle
Y
X
EA-..
EA+..
Syntax: N.. [G00/G01] EA..
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