On Wednesday 09 March 2016 05:03:59 andy pugh wrote: > On 9 March 2016 at 00:24, Gene Heskett <ghesk...@wdtv.com> wrote: > > Just one problem, the limit box in the backplot says the tool tip is > > only about 150 thou below the z axis upper limit!, and my code > > refuses to run because it runs up 4" to a tool change height, which > > there are 3 of in the code.. > > > > This does not make sense, the machine, when at the material top > > surface, is almost 5" below the upper limit/home switch. > > What I think has happened here is that you have filled the tool table > with tool-lengths that are approximately the full travel of the > machine (and negative) > What numbers do you see in the tool table? > > That shouldn't be a problem, but you need to then set up the G54 > offsets too to pull everything down again by touching-off to the work > with a tool in the spindle and with the tool offsets (G43) enabled so > that the system knows to factor the tool-length into the calculations. > > Starting with a blank canvas, you have a situation where Z=0 is at the > top of machine travel. > You then inserted a tool and jogged down several inches, and told the > system that Z was now at zero. The system still thinks that Z=0 is at > the top of machine travel, so the tool offset end up being negative > (imagine a virtual tool pointing back up the spindle to the top home > switch location :-) > > As long as the tool table is consistent, this is probably OK. But I > prefer to work a slightly different way. > > I have my T99 which is a touch-probe. I have decided that that tool is > of zero length. Every other tool has a Z-offset above or below that > nominal zero. > (On the lathe the reference tool is the turn/face T1). I know that > both these tools should have zero offset, and if I mess up and put an > offset in them then I can clear it with G10. > > If you had jogged a reference tool down to the PCB then touched-off > the G54 to that position before touching-off the rest of the tools > you would have ended up with a tool table of offsets relative to the > reference tool, rather than referenced to the Z-axis home position.
And that I believe explains it, I put the measured offset into all 3 tools in the tool table. I have also rewrote the homing to put z=0 at 50% of the Z travel. I think I am good now if I can get my code to behave itself. thank you Andy. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
