Typically a mill like machine has the machine home up for Z. This means that Z travel goes from 0 to -something. Standing in front of the machine with the X axis perpendicular to you positive movement on the X moves the "tool" to the right and positive movement on the Y moves the "tool" away from you and positive movement on the Z moves the "tool" up. The reference to the "tool" is because some machines move the table and some move the spindle. Table to the left moves the "tool" to the right etc.
If you don't have home switches make a match mark for each axis and jog to that point and press the home button when that axis is selected. This will make your limits functional. Typically you move to the zero position of the part and touch off the tool to establish the part position. Once you touch off if the part is within the limits you can run. Some good reading here: http://gnipsel.com/linuxcnc/g-code/index.html Are you by any chance from North Carolina? JT On 10/9/2013 5:00 AM, Richard Thornton wrote: > Thanks Dave and Marius! > > Dave so this is different than table travel from stepconf axis config?: > > MIN_LIMIT = -1000 - The minimum limit (soft limit) for axis motion, in > machine units. When this limit is exceeded, the controller aborts axis > motion. > > MAX_LIMIT = 1000 - The maximum limit (soft limit) for axis motion, in > machine units. When this limit is exceeded, the controller aborts axis > motion. > > Marius so I will set home back to 0 for xyz in stepconf axis config. > > So if I have: > > X axis table travel 0 to 550 home 0 > Y axis table travel 0 to 400 home 0 > Z axis table travel 0 to 60 home 0 > > Does that seem correct? > > Where would the negative values I have seen in example screenshots be > relevant to table travel? > > If the above values are correct what would my values be for MIN_LIMIT > MAX_LIMIT, I am also confused about the use of negative values, the > MIN_LIMIT example above is -1000? > > Thanks again. > > Richard > > Message: 6 > Date: Wed, 9 Oct 2013 08:36:44 +0100 > From: Dave Caroline <dave.thearchiv...@gmail.com> > Subject: Re: [Emc-users] Extremely confused about axis and home, > please help... > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Message-ID: > <CALfYgt=rkGV8wdbmR9PRU90nDYfD=v85TWr=W=qgxwukrgq...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On Wed, Oct 9, 2013 at 6:40 AM, Richard Thornton > <richie.thorn...@gmail.com> wrote: >> Hi, >> >> So I have one of the Chinese 6040 gantry CNC routers, like this, I >> have setup the axis as I have indicated in the image: >> >> https://www.dropbox.com/s/ochmutxnacs4fo6/6040.JPG >> >> The 6040 does not have any limit/home switches yet. >> >> Now under stepconf, using mm, I have setup: >> >> X 0-550 home 275 >> Y 0-400 home 200 >> Z 0-60 home 5 >> >> Putting home in the centre of xy to keep it simple right now >> >> All of the axis move OK, so my next step way to get it to go through >> some gcode without any tool, I get various error but they are all of >> the same flavour: >> >> Program exceeds machine minimum on axis x >> Program exceeds machine minimum on axis y >> Program exceeds machine minimum on axis z > Make sure you edit your axis limits (MIN_LIMIT,MAX_LIMIT) to match. > > in the relevant axis section > see > http://www.linuxcnc.org/docs/devel/html/config/ini_config.html#_axis_lt_num_gt_section_a_id_sub_axis_section_a > > Dave Caroline > >> Linear move on line 7 would exceed joint 0's negative limit >> >> I also get errors about it not being homed, then under "Manual >> Control" I select each axis and click "Home", I think this is wrong. >> >> I tried the LinuxCNC logo gcode that loads as default and created my >> own 50x50 text in Cut2D both give similar errors to the ones above. >> >> https://www.dropbox.com/s/n803ycbfmkm3u8g/Quick%20Engrave%201.ngc >> >> I think I am doing something fundamentally wrong here, please help. >> >> Thanks for looking. >> >> Cheers >> Richard > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from > the latest Intel processors and coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
