John,
Leaving aside right or left hand rules etc, leaning your head towards
your left shoulder shows that the relationship between the spindle and
the carriage is the same as on a vertical mill.
To bring the spindle closer to the carriage is a move in the -Z
direction.
If the argument is about the tool position, with the work in the chuck,
tilt your head to the right and you now have the tool on the right and
the work on the left, like a mill with the tool above (on the right) and
work in the chuck below (on the left0. Now the movement of the tool
towards the work is still -Z.
Marcus
On 2024-02-05 18:01, John Dammeyer wrote:
There's been an interesting discussion on the Unimat users list about
axis direction. As usual someone can always find something on the web
that supports their opinion.
For example this one:
https://digit-chain.com/names-of-axes-in-cnc-machine/
However I disagree that movement towards the rotating axis, be it the
chuck on a lathe or the spinning cutter in a mill spindle, is a Z+
direction. Doesn't even seem intuitive to me either.
Now it's true that you can set the Z=0.00 position anywhere in the
G54... spaces depending on what you touch off on. And then a movement
toward the spindle could be positive. But in an G53 machine
coordinate space isn't a Z- direction towards the spinning tool or
part?
That's the way I have my LCNC system and MACH system set up. Even my
ELS is negative towards the lathe chuck.
John
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