Movement Control Commands
3.1 The coordinate system
04.07
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© Siemens AG 2007 All rights reserved
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
3.1.1 Machine coordinate system (G53)
The machine zero point represents the point that is specific to a machine and ser-
ves as the reference of the machine. A machine zero point is set by the MTB for
each machine tool. A machine coordinate system consists of a coordinate system
with a machine zero point at its origin.
A coordinate system with a machine zero point set at its origin is referred to as a
machine coordinate system. By using manual reference position return after
power-on the machine coordinate system is set. Once set, the machine coordinate
system remains unchanged until power--off.
Format
(G90) G53 X... Y... Z... ;
X, Y, Z, Absolute dimension word
How to select a machine coordinate system (G53)
Once a position has been determined in terms of machine coordinates, the tool
moves to that position in rapid traverse. G53 is a one--shot G code. Thus, any
command based on the selected machine coordinate system is effective only in t he
block where G53 is issued. The G53 command has to be determined by using ab-
solute values. Program the movement in a machine coordinate system based on
G53 whenever the tool should be moved to a machine--specific position.
Cancel of the compensation function
If $MN_G53_TOOLCORR = 0, G53/G153/SUPA is non--modal suppression of zero
offsets, tool length compensation and tool radius compensation, however, remain
active.
If $MN_G53_TOOLCORR = 1, G53/G153/SUPA is non--modal suppression of zero
offsets, and active tool length and tool radius compensation.
G53 specification right after power--on
At least one manual reference position return must be applied after power--on,
since the machine coordinate system must be set before the G53 command is de-
termined.
If an absolute position detector is attached, this is not required.
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