Robert,
as also written by others, the 'override limits' button on the (Axis)
user interface allow you to back of from the limits.
But in general, the limit switches should be placed at such a location
that these are never hit during normal operation.
On my machine the travel of the Y axis (that is what EMC will run as max
limits while jogging or executing G-code) is 0 .. 1000 mm.
My limit switches are placed at -5 and 1005 and are placed such that EMC
stops the motors before hitting the physical limits.
The lower limit switch also acts as a home switch (HOME_OFFSET = -5)
with OVERRIDE_LIMITS = y this allows me to use the limit switch as a
home switch also.
I set my home to 20, just to be sure that I am within the allowable
(software) limits.
Now when I home the Y axis, the spindle moved forward until it reaches
the limit switch and it then backs off and slowly searches the switch again.
This is where my HOME_OFFSET is so Y == -5.
After this the spindle is moved to Y == 20.
Now, during operation the limit switches will never be reached. Hitting
one of the limit switches mean that something went terribly wrong and
the spindle is not where EMC thinks it is. The only thing to do now (for
EMC) is to stop the machine and wait for the user to override the limits
and start again (home location is lost).
Regards,
Rob
robert melville wrote:
> Suppose I am running my XY-table in the positive
> X direction and I hit the X axis limit switch. I would like EMC2
> to remember that I hit the limit while slewing positive in X and
> *only* disable further travel in the positive X direction. Movement/jogging
> in negative X would be allowed so that I could jog the
> table off of the limit.
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