Delta Auto Calibration - slams into bed.

finnerj

Hi, I am new to using Duet Board, but I've seen and read great things about it. So I choose to replace my old board in my Delta to a Duet Board. I've gone through the Guide " I hope Wrongly " as when I work out the probe off set and then save the config & run the auto calibration. The head just slams into the bed.

After this it will then fail to home on the pillars, it fails to go high enough to hit them.

The only thing I've noticed is that sometime in the web interface after homing the Z will report a number 2 to 3 times bigger than my actual Z Height.

And help or pointer will be greatly received.

A Former User

Homing sometimes has different numbers?

Post your config and homing file please.

finnerj

Here are my Config & home files.

config.g
homedelta.g

Veti

M350 X16 Y16 Z16 E16 I0 ; configure microstepping without interpolation

you want to enable interpolation

M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1

B4138 is the default, you need to replace this with the correct values for your thermistor.

M665 L267.0 R134.4 B116 H292.8 X0 Y0 Z0 ; Set delta radius, diagonal rod length, printable radius and homed height

this does not look like the result of the recommended 6 factor calibration. what calibration factor did you configure?

finnerj

@Veti No idea what calibration factor is...

I just followed :- https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

Veti

its the section about the bed.g file in that guide

https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer#Section_Setting_up_the_bed_g_file

dc42

Also take note of this bit:

Initially, we recommend that you set the Z probe dive height in your M558 command to a large value, in case of large errors in your M665 R and H parameters or in your endstop trigger heights, that could otherwise cause the nozzle to scrape the bed before probing starts. For example, add parameter H30 to your M558 command in config.g. This will make probing start 30mm above where the firmware thinks the bed ought to be, instead of the default 5mm.

Dugee

@finnerj double check your steps/mm also

finnerj

cheers all, from the pointers.

I've got my machine playing nicely now