> >
> >> originally created by pncconfig. Should not
> >>> setp hm2_7i92.0.stepgen.00.control-type 1
> >>> be control-type 0?
> >>>
> >>
> >> No, needs to be 1
> >
> > So what does it need to be for the spindle then?
>
> Also 1 since you are setting the steprate from the spindle speed
>
> >
> > The tutorial suggests stepgen is type 0 for step/dir and "ctrl_type" type v
> > for velocity.
> >
> > I haven't found the details on "control-type" in a document yet.
>
>
>
> > hm2_7i92.0.stepgen.05.control-type
> > Perhaps I overlooked it somewhere?
>
> man hostmot2, stepgen section
>
Yes but... to quote
http://linuxcnc.org/docs/html/man/man9/hostmot2.9.html#stepgen
"(bit input) control−type
Switches between position control mode (0) and velocity control
mode (1). Defaults to position control (0)."
Why then do the XYZA axis have control_type set to 1 when the above snippet
clearly says position control mode is 0?
Is this then an error in the manual or just poorly explained? Does LinuxCNC,
when used to run a milling machine, use velocity control to move the motor and
somehow also track the position?
When I wrote my Electronic Lead Screw software that had to track the spindle
speed the velocity of the Z axis carriage motor was critical and the position
was really only used to decide when to finish accelerating and when to
decelerate. Since the CNC G-Code specifies feed rate and in the case of
multiple axis the feed rate along the path I can see that this might well be
the way it's done. But with the manual stating 0 (position mode) is the
default and that G-Code tends to change positions but often leave the feed rate
constant it's a bit confusing.
John
> Peter Wallace
> Mesa Electronics
>
>
>
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