Here's what the documentation has to say about the feed rate in
units-per-minute mode:
1. If any of XYZ are moving, F is in units per minute in the XYZ
cartesian system, and all other axes (UVWABC) move so as to start and
stop in coordinated fashion
2. Otherwise, if any of UVW are moving, F is in units per minute in
the UVW cartesian system, and all other axes (ABC) move so as to start
and stop in coordinated fashion
3. Otherwise, the move is pure rotary motion and the F word is in
rotary units in the ABC “pseudo-cartesian” system.
http://www.linuxcnc.org/docview/html/common_machining_center.html#sub:Feed-Rate
So when you command
G1 A... F300
then your A-axis motion is at 300 degrees per minute, but when you
command
G1 X... A... F300
then your motion is at 300 mm per minute along X, with A moving at a
rate that makes it complete the motion at the same time as X (actually,
it'll move X slower than 300mm/minute if necessary in order to keep to
the maximum A velocity specified in your inifile)
Some people prefer to program in "inverse time mode" when mixing rotary
and linear movements; in this mode, you specify how long the move should
take, not how fast some axes should move.
In inverse time feed rate mode, an F word means the move should be
completed in [one divided by the F number] minutes. For example, if the
F number is 2.0, the move should be completed in half a minute.
http://www.linuxcnc.org/docview/html/gcode_main.html#G93,%20G94,%20G95:%20Set%20Feed%20Rate%20Mod
Jeff
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