I always configured my machines with machine zero at the most positive
position Ie
facing the machine
tool position not table position
X as far right as it will go
Y as far away as it will go
Z as far up as it will go
two reasons, all the WPC offsets were always negative.
zero return is always in the same direction
Therefore, I didn't have to 'thnk' (remember) "Which way did I configure
this machine?"
I did this no matter the control manufacturer. Outside service men were
sometimes confused but operators quickly adjusted.
regards
Stuart
On Thu, Apr 2, 2026 at 6:48 PM Luca Toniolo <[email protected]> wrote:
> I'm sorry, I just saw what he wrote, Z homes at 4 is wrong, Z should home
> at 0, and Z works in negative, this is pretty standard, you'll have a lot
> of headaches if you don't do it that way.
>
> On April 3, 2026 7:31:39 AM GMT+08:00, andy pugh <[email protected]>
> wrote:
> >On Thu, 2 Apr 2026 at 23:49, Luca Toniolo <[email protected]> wrote:
> >>
> >> If your Y plus is toward the back of the machine, and your homing
> sensor is toward the back of the machine, you home at 30 not at 0.
> >
> >It's often better to home to 0 and set the lower limit negative.
> >LinuxCNC works equally well either way, but some CAM systems make
> >assumptions.
> >Admittedly generally with Z. (Fusion 360 CAM will often insert a G53
> >Z0 as a full retract).
> >
> >You need to work out if the axis is reversed entirely, or just the
> >homing direction.
> >
> >The solution might be as simple as specifying negative
> HOME_SEARCH_VELOCITY
> >
> >--
> >atp
> >"A motorcycle is a bicycle with a pandemonium attachment and is
> >designed for the especial use of mechanical geniuses, daredevils and
> >lunatics."
> >— George Fitch, Atlanta Constitution Newspaper, 1912
> >
> >
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