> -----Original Message-----
> From: andy pugh [mailto:[email protected]]
> Sent: April-02-21 7:55 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Rotary axis preview (in axis interface)
>
> On Fri, 2 Apr 2021 at 11:40, andy pugh <[email protected]> wrote:
>
> >
> > With no other, better, choice, the rotations in the preview are around the
> > machine origin.
> >
>
> An update in Master has been brought to my attention:
> http://linuxcnc.org/docs/devel/html/config/ini-config.html#_display_section
> The GEOMETRY string can now include a "!"
>
> --
Ah. That appears to make a difference and now shows I have one other issue
with the display compared to real life. Because my knee moves up and down and
my home position is at the lowest point of knee travel after homing the tool
cone is shown at the top of the work envelope. The little blue icon (I think
represents machine home position) is also at the top and with the !AXYZ shows
rotation around this point.
I have reset all G54, G92, etc. to be 0.
A negative Z motion from Z=0 still moves closer to the tool. A positive moves
away from the tool.
The write-up
http://linuxcnc.org/docs/devel/html/config/ini-homing.html#cha:homing-configuration
is a bit confusing because it expects the home and limit switch at the other
end of what I have. Which isn't safe since homing towards the spindle that
might still hold a tool is somewhat dangerous.
So I've made changes to that page which I scanned and put here:
http://www.autoartisans.com/mill/HomeSwitchInfo.pdf
net max-home-z => axis.2.home-sw-in
net max-x-y-min-z => axis.2.neg-lim-sw-in
net max-home-z => axis.2.pos-lim-sw-in
Now this all works. Motion from Home is negative towards the spindle as the
knee moves up. Soft limits work without hitting the switches and loading a G
code file outside the working envelope raises an error. So all is good.
Except... If the HOME_OFFSET is 0.2 and the + LIMIT switch was used to
determine HOME why does the machine home icon show up at the top left of the
work envelope on the AXIS display as in
http://www.autoartisans.com/mill/Screenshot_2021-04-01_19-00-35.png
Moving the knee towards the spindle show correct motion in the downwards
direction (more negative).
And Z G54 axis is pointed up for more positive. If I move all axis to
roughly to the center of the work envelope and touch of all three axis then the
XYZ arrows move down to that position. Reload the GCode and it's positioned
relative to that 0,0,0 point. The A axis still rotates around the machine home
position.
I must be missing something obvious. Any other variations of MIN or MAX LIMITs
can move Machine Home to the bottom left hand corner but then soft limits no
longer work or I've run the knee into the end of travel during the move to
HOME_OFFSET.
Maybe I'm puzzled about something that isn't important. It all started me
worrying when the A Axis rotated around machine home that appeared to be on the
wrong end of the work envelope.
John
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