Auto delta calibration issue

[ander]

Hi there! i have an issue with my homemade delta, when i push homing it goes straight to find the endstops and it does the homing well, but when i press auto delta calibration, it goes finding the home first and when that happens, it finds the endstops, it stops when finds them, and suddenly, instead of going down looking for the bed starts hitting the endstops so hard i have to switch the machine off. i went to bed.g and delete g28 and copy exactly what puts in the homedelta.g
(G91 ; relative positioning
G1 S1 X833 Y833 Z833 F4800 ; move all towers to the high end stopping at the endstops (first pass)
G1 X-5 Y-5 Z-5 F4800 S2 ; go down a few mm
G1 S1 X10 Y10 Z10 F360 ; move all towers up once more (second pass)
G90 ; absolute positioning)

And still makes the same thing.
What can i do?
Thanks

[ander]

Well....i think i found myself the solution....i dont know why but if i start the delta and i do a homing Z gives a Z 450mm positive value, but after making the calibration and push homing, it goes to the home with no problem but the value is negative....what should i check?

[dc42]

Please post your config.g file. I suspect you have an error in the M665 or the M574 command in it.

[ander]

@dc42 0_1540557337372_config.g

[Dougal1957]

@ander do you really have a 440mm diameter bed?

[ander]

@dougal1957 this is a printable surface, the bed is 480mm diameter

[Dougal1957]

and you diagonal rods are only 408mm long ?

[dc42]

As Dougal says, check your M665 parameters. If the printable diameter of the bed really is 440mm, then the rods must be longer than 440mm.

Also check that you don't have any deployprobe.g or retractprobe.g files in /sys on the SD card unless you created them yourself.

[ander]

Hi, i just checked it and it was this, thanks for the help,you guys are giving a really nice support