Thanks everyone. On the Unimat list there were a number of people really pushing the idea that Z+ was towards the chuck and it just didn't make sense. And as we all know, nowadays once can find an internet source that supports almost anything.
Now if only the wand with the partridge feather core would arrive. I'm sure the site selling it was not a con job. John > -----Original Message----- > From: andrew beck [mailto:andrewbeck0...@gmail.com] > Sent: February 5, 2024 3:05 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Axis direction > > Same here every machine I have used (12 years CNC machining). negative z > is always towards the chuck. > > Or on a mill brings the tool down to table. Or table up towards tool > > > > On Tue, 6 Feb 2024, 09:23 Sam Sokolik, <samco...@gmail.com> wrote: > > > Even the k&t with a discrete component 60's control had smaller numbers > > towards the spindle... > > > > On Mon, Feb 5, 2024, 1:36�PM <marcus.bow...@visible.eclipse.co.uk> > wrote: > > > > > > > > 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 > > > > > > > > > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
