10: PROGRAMMING
The G37 position is in G53 machine coordinate space. It
defaults to (0, 0, 0), or the top left rear of machine travel (the
same as the X-, Y-, and Z-axis reference position).
G37.1 supports X and Y tool offsets. If there are X or Y tool
offsets present in the tool table (manually applied through a
G10 L1 command), they offset the spindle position. This
enables G37 for tools mounted in an auxiliary spindle installed
on the spindle column.
Note: If G10 L1 is used to change the X or Y offset of
the currently loaded tool, you must then apply the
new offsets with a G43 command.
G37.1 performs as follows:
1. A rapid upward move to the Z clear position (which is
always G53 Z = 0.0).
2. A rapid move in X and Y to the X and Y ETS coordinates.
3. A rapid downward move in Z to the Z ETS coordinate.
Note: The Z word saves time by rapidly moving
closer to the ETS before the slower probing
begins. You must use caution if you set this
lower than G53 Z = 0.0. If you don't, there's a
risk that a long tool could collide with the ETS
and damage it and the tool.
Move and Measure Tool Length (G37)
To move and measure the tool length, program:G37 H~ P~
l H~ saves the measured tool length to the H tool table
entry instead of the current tool number's entry.
You could use this to track tool wear between the two
tool table entries, for example.
Note: The newly measured tool length isn't
applied, but it's stored in the tool table entry
for tool number H.
l P~ is positive or negative tolerance. It measures the tool
length, but, instead of storing it in the tool table,
compares it to the length in the tool table. If the
difference exceeds the P tolerance, the G-code program
stops.
You could use this to detect broken or improperly
inserted tools that are not fully seated in the spindle, for
example.
G37 with no optional words moves to the G37 ETS position
(through G37.1), probes the ETS, stores the new tool length in
the tool table entry of the current tool, and applies the tool
length offset.
G37 fails if the spindle nose hasn't been referenced to the ETS
after a Z-axis reference. This sets a G53 coordinate at the ETS
trigger point such that the measured tool length is the distance
of the spindle nose to ETS reference. For more information,
see the ETSG37 Spindle Nose Reference group on the
ETSSetup tab.
So that tool length measurements have consistent results, G37
uses the fine probe feed rate of 2.5 in./min for the final ETS
touch. G37 uses the rough probe feed rate for the first ETS
touch.
G37 performs as follows:
1. Issues a G37.1 move to the ETS location.
2. A downward rough probe feed rate move until the tool
triggers the ETS.
3. An upward retract move of 0.100 in. to back off the
triggered ETS.
4. A downward slow ETS probe feed rate move until the
tool triggers the ETS.
5. An upward retract move of 0.100 in. to back off the
triggered ETS.
6. An upward rapid move to the G37 ETS Z position.
10.2.12 Straight Probe (G38.x)
G38.2 probes toward the workpiece, stops on contact, and
signals error if failure
G38.3 probes toward the workpiece and stops on contact
G38.4 probes away from the workpiece, stops on loss of
contact, and signals error if failure
G38.5 probes away from the workpiece and stops on loss of
contact
G38.6 moves away from the workpiece and ignores probe
input
To perform a straight probe operation program: G31 X~ Y~
Z~ A~
Conventionally, the probe is tool #99. The rotational axis words
are allowed, but it's better to omit them. If rotational axis
words are used, the numbers must be the same as the current
©Tormach® 2023
Specifications subject to change without notice.
Page 205 Tormach 1100M® Operator's Manual (Version 1223A)
For the most recent version, see tormach.com/support
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