Smithy CNC Mills User Manual
Page 23
SmithyCNC Programmer’s Reference Manual:G Codes
SmithyCNC Programmer’s Reference Manual: G-Codes
2-8
2.10 G38.2: Straight Probe
Program G38.2 X- Y- Z- A- B- C- to perform a straight probe operation. The axis
words are optional, except that at least one of them must be used. The tool in the
spindle must be a probe.
It is an error if:
* the current point is the same as the programmed point.
* no axis word is used
* cutter radius compensation is enabled
* the feed rate is zero
In response to this command, the machine moves the controlled point (which
should be at the end of the probe tip) in a straight line at the current feed rate
toward the programmed point. In inverse time feed mode, the feed rate is such that
the whole motion from the current point to the programmed point would take the
specified time. If the probe does not trip during the move, an error is signalled.
After successful probing, parameters 5061 to 5066 will be set to the coordinates of
the location of the controlled point at the time the probe tripped.
A comment of the form (PROBEOPEN filename.txt) will open filename.txt and store
the coordinate of each successful straight probe in it. The file must be
closed with (PROBECLOSE).
2.11 G40, G41, G42: Cutter Radius Compensation.
G41,-G42:>
To turn cutter radius compensation off, program G40. It is OK to turn compensation
off when it is already off.
Cutter radius compensation may be performed only if the XY-plane is active.
To turn cutter radius compensation on left (i.e., the cutter stays to the left of the
programmed path when the tool radius is positive), program G41 D- . To turn
cutter radius compensation on right (i.e., the cutter stays to the right of the pro-
grammed path when the tool radius is positive), program G42 D- . The D word is
optional; if there is no D word, the radius of the tool currently in the spindle will be
used. If used, the D number should normally be the slot number of the tool
in the spindle, although this is not required. It is OK for the D number to be zero; a