Smithy CNC Mills - Manual (Page 64)

SmithyCNC Programmer’s Reference Manual: Other Codes
SmithyCNC Programmer’s Reference Manual: Other-Codes 5-2
OTHER CODES
5.1 F: Set Feed Rate
To set the feed rate, program F- . The application of the feed rate is as
described in Section [sub:Feed-Rate], unless inverse time feed rate mode is in
effect, in which case the feed rate is as described in Section [sub:G93,-G94:-
Set].
5.2 S: Set Spindle Speed
To set the speed in revolutions per minute (rpm) of the spindle, program S- .
The spindle will turn at that speed when it has been programmed to start turn-
ing. It is OK to program an S word whether the spindle is turning or not. If the
speed override switch is enabled and not set at 100%, the speed will be differ-
ent from what is programmed. It is OK to program S0; the spindle
will not turn if that is done. It is an error if:
* the S number is negative.
As described in Section [sub:G84:-Right-Hand-Tapping], if a G84 (tapping)
canned cycle is active and the feed and speed override switches are enabled,
the one set at the lower setting will take effect. The speed and feed rates will
still be synchronized. In this case, the speed may differ from what is pro-
grammed, even if the speed override switch is set at 100%.
5.3 T: Select Tool
To select a tool, program T-, where the T number is the carousel slot for the
tool. The tool is not changed until an M6 is programmed (see Section [sub:M6:-
Tool-Change]). The T word may appear on the same line as the M6 or on a pre-
vious line. It is OK, but not normally useful, if T words appear on two or more
lines with no tool change. The carousel may move a lot, but only the most
recent T word will take effect at the next tool change. It is OK to program T0;
no tool will be selected. This is usefulif you want the spindle to be empty after a
tool change. It is an error if:
* a negative T number is used,
* or a T number larger than the number of slots in the
carousel is used.