Homing does not bother about the current position, i.e. it does
not matter if it has to move into the "negative" from the
perspective of the power-on coordinates. It will slowly move
towards the homing switch you configured and when it hits the
switch it will reset the coordinate to the homing coordinate you
have configured for the axis. You can configure the homing
direction (min/max), and the homing position (to which the
coordinate is reset).
Or for the modern 6axis endstop syntax:
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One thing to check is polarity of the switches. It is best to
wire the switches in NC i.e. "normally closed" configuration, i.e.
they are conducting current, until pressed, usually pulling down
an input pullup resistor. So in case your wires break, it is
treated as if the switch was pressed, for safety.
I frankly not longer remember how it all is configured on Smoothie, but it's a thing to check.
Also I'm not sure Smoothie support the G28
X command without a coordinate. Try G28 without any axis letters, or try G28 X0 or
whatever homing coordinate you want.
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> the X and Y axes are moved to the same position but not at all to the limit switches.
what exactly do you mean?
If they do not move far enough, check the max_travel settings.
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Sorry, I still don't understand. Auf Deutsch vielleicht?
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OK, after having received your PM in German, I think I understand what happens. I answer here in the group, so others with the same problem can find the solution later.
Which firmware do you use? Mine?
You need my extensions if you want to use OpenPnP in a modern way.
I think you flashed a firmware that was compiled in GRBL_MODE. The command is then not G28 but $H.
G28 changes its meaning and moves
the machine back to the homing location instead. So exactly what
you are observing.
Note: I do recommend you use the firmware from my blog, which is compiled without GRBL_MODE, as it is the standard OpenPnP convention. But if you insist you can recompile the sources with GRBL_MODE, arguably it is more "CNC standard". OpenPnP Issues & Solutions will automatically detect this and use $H as the homing command.
In any case, be sure to use Issues & Solutions to
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> I have to check whether I am working with GRBL_MODE.
Yes you are, the -cnc suffix tells me that.
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Make sure you download the binary file and not the HTML page.
Click the file you want, then click the View Raw button to get the raw binary file.
Flashing the HTML will mean the leds will not flash :)
the firmware-cnc.bin is a build for CNC. It has a different layout for the optional LCD more suited to CNC, this layout requires a graphic LCD. This build also excludes modules required for 3D printing like temperature control and extruders etc. It has only 3-axis compiled in. It also uses $H to home as G28 is used to park in real GCode.
The regular firmware.bin builds are for 3D printers and exclude CNC moudules such as spindle and drilling cycles. It has 5-axis built in so you can use two extuders out of the box.
Sorry Mark that was my mistake
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