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    Homing advice

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    Tuning and tweaking
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      This sounds like a case of incorrect coordinate system.

      Please have a look at these posts

      https://forum.duet3d.com/topic/12676/mirrored-x-axis/9
      https://forum.duet3d.com/topic/14971/vcore-pro-core-xy-the-x-and-y-axis-home-issue/4

      Basically, you must decide where the front of your printer is when you're looking at it. Then the front left corner is the origin point 0,0.
      The homing position is where the endstops are. They aren't always going to be at 0,0.
      Is the X endstop on the left or right?
      Is the Y endstop at the front or back?
      The M574 commands that define the endstops must match where they physically are. High or low end of travel.
      +X moves to the right, -X to the left. -Y to the front, +Y to the back.
      The homing files must move towards the endstops.

      Z-Bot CoreXY Build | Thingiverse Profile

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      • agent0810undefined
        agent0810
        last edited by

        Thanks for the reply!

        ill def have a look at those posts.

        and this maybe where im getting confused. the stops are in the back right corner. i thought that was 0,0. right now +x moves to the left and +y moves towards me or what im calling the front of the printer.

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        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          So you have the choice of either viewing the "back" of the printer as the "front" and choosing the back right corner as 0,0 and the homing position, or choosing the front left as 0,0 and the homing position at the high end of travel in the back right corner.

          Either way is fine, but you need to be careful that you don't get an axis flipped which can lead to printed models being mirrored from what the slicer shows since the slicer is assuming the 0,0 position is in the front left and +X moves to the right, -X to the left. -Y to the front, +Y to the back.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • agent0810undefined
            agent0810
            last edited by

            so i think i would like to keep the Back of the printer as the 0,0 since that is where the stop switches are. but im still confused on what i need to change to make that happen. i know im being a complete noob and i apologize for that .

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Well 0,0 and the endstops don't have to match. Homing to the high end of travel is fine. This has the benefit of staying matched with the slicer view and stays consistent with the language normally used with printers, namely the right handed coordinate system, meaning +X moves to the right, -X to the left. -Y to the front, +Y to the back.

              Here are some illustrations.

              left_right_hand.gif dbot axis.png Cartesian-coordinate-system.png

              So in your case, here's what you need to change in your config.

              ; Endstops
              M574 X2 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
              M574 Y2 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
              

              Instead of X1 and Y1, it's not X2 and Y2, for the high end of travel, back right corner.

              And change the directions of travel for the homing moves from negative to positive.

              ; homeall.g
              ; called to home all axes
              ;
              ; generated by RepRapFirmware Configuration Tool v3.1.3 on Sun Jul 05 2020 20:32:27 GMT-0500 (Central Daylight Time)
              G91 ; relative positioning
              G1 H2 Z5 F6000 ; lift Z relative to current position
              G1 H1 X+250 Y+250 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
              G1 H2 X-5 Y-5 F6000 ; go back a few mm
              G1 H1 X+230 Y+230 F360 ; move slowly to X and Y axis endstops once more (second pass)
              G1 H1 Z305 F360 ; move Z up stopping at the endstop
              G90 ; absolute positioning
              G92 Z300 ; set Z position to axis maximum (you may want to adjust this)
              
              ; homex.g
              ; called to home the X axis
              ;
              ; generated by RepRapFirmware Configuration Tool v3.1.3 on Sun Jul 05 2020 20:32:27 GMT-0500 (Central Daylight Time)
              G91 ; relative positioning
              G1 H2 Z5 F6000 ; lift Z relative to current position
              G1 H1 X+250 F1800 ; move quickly to X axis endstop and stop there (first pass)
              G1 H2 X-5 F6000 ; go back a few mm
              G1 H1 X+230 F360 ; move slowly to X axis endstop once more (second pass)
              G1 H2 Z-5 F6000 ; lower Z again
              G90 ; absolute positioning
              
              ; homey.g
              ; called to home the Y axis
              ;
              ; generated by RepRapFirmware Configuration Tool v3.1.3 on Sun Jul 05 2020 20:32:27 GMT-0500 (Central Daylight Time)
              G91 ; relative positioning
              G1 H2 Z5 F6000 ; lift Z relative to current position
              G1 H1 Y+230 F1800 ; move quickly to Y axis endstop and stop there (first pass)
              G1 H2 Y-5 F6000 ; go back a few mm
              G1 H1 Y+230 F360 ; move slowly to Y axis endstop once more (second pass)
              G1 H2 Z-5 F6000 ; lower Z again
              G90 ; absolute positioning
              

              Z-Bot CoreXY Build | Thingiverse Profile

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              • agent0810undefined
                agent0810
                last edited by

                thank you for the detailed explanation, makes a little more sense now. still working on understanding the settings though. i made you suggested changes and now the extruder is in the front right corner and when i do home all sits there and bangs over and over when each of the axis homes.

                X+ currently moves to the left
                Y+ moves towards myself or the front
                Z+ moves the bed up

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                • Phaedruxundefined
                  Phaedrux Moderator
                  last edited by

                  Did you copy and paste my homing files into yours?

                  And just to confirm...
                  Is the X endstop on the left or right?
                  Is the Y endstop at the front or back?

                  Z-Bot CoreXY Build | Thingiverse Profile

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                  • agent0810undefined
                    agent0810
                    last edited by

                    yes sir, copied and pasted.

                    The Y is in the back right corner.
                    The x is on the right,

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                    • Phaedruxundefined
                      Phaedrux Moderator
                      last edited by Phaedrux

                      @Phaedrux said in Homing advice:

                      M574 X2 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y2 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop

                      And you changed M574 to X2 and Y2?

                      Z-Bot CoreXY Build | Thingiverse Profile

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                      • agent0810undefined
                        agent0810
                        last edited by

                        yes sir copied all 3 homing files and pasted over mine.

                        ; Endstops
                        M574 X2 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
                        M574 Y2 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
                        M574 Z2 S1 P"zstop" ; configure active-high endstop for high end on Z via pin zstop

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                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          Alright, then we may need to change a motor direction.

                          ; Drives
                          M569 P0 S1 ; physical drive 0 goes forwards
                          M569 P1 S1 ; physical drive 1 goes forwards
                          

                          Try

                          M569 P0 S0
                          M569 P1 S0

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • agent0810undefined
                            agent0810
                            last edited by

                            That may have done it.

                            X+ Moves to the right !!!!!!
                            Y+ Moves to the Back!!!!
                            Z+ Moves up!!!!!

                            so after i home, the "position tool" says its X - 225.0, Y 225.0, Z - 300.00 thats what i want right?

                            Phaedruxundefined 1 Reply Last reply Reply Quote 0
                            • Phaedruxundefined
                              Phaedrux Moderator @agent0810
                              last edited by

                              @agent0810 said in Homing advice:

                              X - 225.0, Y 225.0, Z - 300.00

                              Are those negative values?

                              Z-Bot CoreXY Build | Thingiverse Profile

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                              • agent0810undefined
                                agent0810
                                last edited by

                                no dashes,

                                Status
                                Printing
                                Mode: FFF
                                Tool Position
                                X
                                225.0
                                Y
                                225.0
                                Z
                                300.00

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                                • Phaedruxundefined
                                  Phaedrux Moderator
                                  last edited by

                                  The last thing to check is that when you move to 0,0 it's at the corner of the bed. If it's not, then you'll have to adjust the M208 maxima values.

                                  Z-Bot CoreXY Build | Thingiverse Profile

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                                  • agent0810undefined
                                    agent0810
                                    last edited by

                                    so when i "home all" it sends it to the back right corner. when i got to 0,0 it goes to the front left corner. when i try to start a print, it starts in the back right corner, bangs against the stops then the bed starts to lower all the way.

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                                    • Phaedruxundefined
                                      Phaedrux Moderator
                                      last edited by

                                      What do you have in your start gcode?

                                      Z-Bot CoreXY Build | Thingiverse Profile

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                                      • agent0810undefined
                                        agent0810
                                        last edited by

                                        Here is the start:

                                        ;FLAVOR:Marlin
                                        ;TIME:336
                                        ;Filament used: 0.10025m
                                        ;Layer height: 0.2
                                        ;MINX:89
                                        ;MINY:95
                                        ;MINZ:0.2
                                        ;MAXX:131
                                        ;MAXY:125
                                        ;MAXZ:14.8
                                        ;Generated with Cura_SteamEngine 4.6.1
                                        M140 S60
                                        M105
                                        M190 S60
                                        M104 S230
                                        M105
                                        M109 S230
                                        M82 ;absolute extrusion mode
                                        M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
                                        M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
                                        M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
                                        M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
                                        M220 S100 ;Reset Feedrate
                                        M221 S100 ;Reset Flowrate

                                        G28 ;Home

                                        G92 E0 ;Reset Extruder
                                        G1 Z2.0 F3000 ;Move Z Axis up
                                        G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position
                                        G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line
                                        G1 X10.4 Y200.0 Z0.28 F5000.0 ;Move to side a little
                                        G1 X10.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line
                                        G92 E0 ;Reset Extruder
                                        G1 Z2.0 F3000 ;Move Z Axis up

                                        G92 E0
                                        G92 E0
                                        G1 F5100 E-7
                                        ;LAYER_COUNT:86
                                        ;LAYER:0
                                        M107

                                        Phaedruxundefined 1 Reply Last reply Reply Quote 0
                                        • Phaedruxundefined
                                          Phaedrux Moderator @agent0810
                                          last edited by

                                          @agent0810 said in Homing advice:

                                          M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
                                          M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
                                          M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
                                          M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk

                                          Unrelated, but delete those lines from your slicer start gcode section in Cura.

                                          I don't see a G90 in there to make sure you're in absolute positioning mode.

                                          Does it do the prime line correctly or does it just start crashing?

                                          Z-Bot CoreXY Build | Thingiverse Profile

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                                          • agent0810undefined
                                            agent0810
                                            last edited by

                                            just starts crashing.

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