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Yes, G1 moves are controlled by the feed rate but G0 moves are at full machine speed
Also multi-axis G1 are coordinated but G0 moves are not.


You  could use some logic (say not + or components) or the lut5 component
in conjunction with your external spindle-at-speed signal to force  spindle-at-speed
true either when the spindle is on and the external spindle-at-speed is true or
the spindle is off.

A lut5 example might look like this:

setp lut5.0.function 0x0d
net spindle-on lut5.0.in-0
net ext_spindle-at-speed lut5.0.in-1
net spindle-at-speed lut5.0.out

A lut5 function value of 0x0d means it's output will be true either when in-0
(spindle-on) is false or if both in-0 (spindle-on) is true and in-1 (ext-spindle-at-speed)
are true.


man lut5

 

If I understand what I've just read correctly, G0 moves are full speed, whereas G1 are controlled?

This would explain why the tool change/probing code I used as the basis for mine uses G1 calls.

However if it is only the first feed move after the spindle start that matters then I may be able to work around it by making the first move a rapid one?

I'll have a look at whether there's a way to have a "true" value when it is stopped anyway.