On Fri, Aug 16, 2013 at 09:22:09AM -0500, Charles Steinkuehler wrote:
> 
> I _think_ this is "spindle hold" in "conventional" LinuxCNC usage, 

motion.spindle-at-speed

> where you don't want to start moving until the spindle is up to
> cutting speed.

Don't want to start *cutting*.  You do want to be able to rapid into
position while the spindle is spinning up.

>  Can anyone point to an overview of how to use the spindle signals in
> HAL, and/or comments on if this would be applicable to use to prevent
> motion on *SOME* axis (ie: the extruder) but not others (ie: X, Y, Z)?

I think by axis is probably the wrong way to think about it, and you
should consider rapid vs feed instead, as linuxcnc already does?

http://www.linuxcnc.org/docs/html/man/man9/motion.9.html

motion.spindle-at-speed IN BIT:
        Motion will pause until this pin is TRUE, under the following
        conditions: before the first feed move after each spindle
        start or speed change; before the start of every chain of
        spindle-synchronized moves; and if in CSS mode, at every
        rapid->feed transition.

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