CNC with no end limit's

[Egauss]

Anybody can point me how to setup CNC with no end stops, limit switches, I did config file without them, was using tool. But DWC still asking to home before do any movement....

[EducatingSavvas]

@egauss Have you looked at this yet: https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing

[Sindarius]

@egauss What I have done is replace whatever is in homeall.g with the following, adjust based one whatever axes you have configured.

G92 X0 Y0 Z0

You can also go to the individual homex.g homey.g and homez.g and put in G92 commands there as well.

[droftarts]

@egauss The firmware will set all axis positions to 0 on power up. You can add M564 H0 S0 to your config.g to allow movement of axes that have not been homed, and allow movement outside boundaries set by M208. See https://duet3d.dozuki.com/Wiki/Gcode#Section_M564_Limit_axes

With any of the commands that allow you to move the axes before the firmware really knows where it is, exercise caution or you may wreck your machine.

Ian

[Egauss]

@droftarts Thank you, i will try this evening

[Egauss]

@sindarius Thanks

[Egauss]

@droftarts Does the Warning to home at DWC for axis will stay all the time?

[Phaedrux]

Only when unhomed. Once the axis have been homed (by any means), no more warning.

[SupraGuy]

If you use G92 to set Z to zero, make sure that you allow the Z axis to go negative by more than you will need to cut, or set it to the minimum depth. The firmware by default won't allow the axis to go negative, so you will get an error "out of limits" and your gcode will abort when you try to plunge into the work.

You'll also want to allow negative movement in the X and Y axes as well, since most CAM software sets the 0,0 point as the outside of whatever shape you're cutting and will want to go negative by at least 1/2 your tool diameter at some point.