On 01/21/2020 09:39 AM, dave engvall wrote:
Specifically, I use a cheap laser diode and move
manually or jog to preposition the X and Y to a specific
place. I mounted a tab on the right lower side of the
table and adjust position so there is a small penumbra
around a hole in the tab. Kick off homing and it finds the
index and then proceeds to the predetermined offsets.
Works a charm. For Z I adjust manually to a given point
and just kick it off. It probably doesn't make much
difference anyway since one always touches off to the top
of the work. Just have to make certain I have enough
distance between z max and work plane to back off. :-)
The big advantage of consistent homing is that the limits of
machine travel can be entered in the .ini file.
Then, when you load a file, it IMMEDIATELY informs you if
the program will exceed any travel limit.
It is ENORMOUSLY helpful when making parts that are near the
limits of the machine to be warned before
the spindle even starts that you need to reposition the
work. If you don't touchoff to the workpiece
until after the program is loaded, then you get the warning
when you hit run, still before the tool touches the
workpiece. After I finally got around to getting my home
switches mounted, I was kicking myself for
not having done it earlier!
Jon
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