Z-Probe not triggered when calibrating

I have just built the printer and everything is fine until I try to calibrate the bed position. The instructions say that after the Home All process the head should stop 4mm above the bed, but it is more like15mm. When I try a z-probe calibration the head moves around and lowers until it should contact the bed but stops just a millimetre above it, then moves onto the next point. The result is a failed calibration: "Error: Z probe was not triggered during probing move".

Any help would be greatly appreciated.

It sounds like he H parameter in your M665 command in config.g is too low. However, instead of changing it directly, I suggest you increase the H parameter in the M558 command by 20, then auto calibrate. Then run M665 and M666 with no parameters, and plug the values it displays into the M665 and M666 commands in config.g, and at the same time reduce M558 H back to normal.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks for the reply, however I am completely new to 3d printing and that sounds very complicated for something that should be working out of the box.

Hi,
I would check your micro switch operating positions, there are always going to be small differences between builds and this has to be compensated for in configuration settings, this however sounds rather a big difference and I would imagine some mechanical problem.

Changing the settings as dc42 suggests is not as difficult as it sounds and you will need to become aware of the settings available in the
config.g - homedelta.g and bed.g files to get practical use of the machines superb abilities, it's a steep learning curve but well worth it.
I haven't posted much on here but have read Lots! and would like to thank dc42 and the other contributors for all their efforts, hopefully now I have mine running well I will be able to help others too.

Steve.

P.S. If you can, try to post your config.g text file, it would help to see if your starting settings are something close to begin with.

I am having a similar issue. except it does 4 probes, triggering the proximity sensor. after the probe, it displays "Error: Z probe was not triggered during probing move"
I have it connected to AD12, same as the diagram on here [forums.reprap.org]
I just don't get why it probes fine and shows triggered with M119 but it says probing canceled due to errors.

Try increasing the dive height (M558 H parameter), in case it isn't pushing down far enough.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

I did just that and it works perfectly! Thanks!

Mine was exactly the same. All I did was change M665 setting to H170. Now works perfectly.

Quote
gromyjoe
I did just that and it works perfectly! Thanks!

If you now run M665 and M666 with no parameters and copy the values it returns into the M665 and M666 commands in config.g (notably the M665 H parameter - see previous post), you will be able to reduce the M558 H parameter back to a lower value, for faster probing.

Edited 1 time(s). Last edit at 05/19/2017 07:15AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Cheers, I'll try that sometime.
I'm not in a rush to do things so faster probing doesn't bother me.
It currently works as I've printed the robot and 3 extra feet to lift it off the worktop for better ventilation.
Took over a week to build the thing in the first place!
Lots of learning over the coming weeks.

Hi again. So I followed your helpful advise DC42 but sorry no change.
Status so far.
I'm getting the exact symptoms DanF124 is getting.
Head stops about 15mm above. (Although head position says 4.0)
M558 original is H4. So I changed it to H24 as suggested and did a calibration.
When the head goes to the side during calibration it jumps up about 20mm then lowers to the base.
After it's finished it shows Head Position for Z as 28.13
So after noting the original figures for M665 and M666 I ran them with no parameters.
They returned the exact same parameters that were already in there.
Returned M558 to H4.
Result - no change.

If I set M665 to H170 it seems to go down enough when I run Home All but I've yet to measure the gap.
The Head position then says 4.0
If I then run the Auto Delta Calibration the Z goes down to 2.09 Run it again and it's back to 4.00
Thereafter stays at 4.
Not sure where to go from here. I'm beginning to think it may be a hardware reason the
head is not going down enough but I've double and treble checked my build and can't see anything obvious.
Your help is most appreciated.

Bear in mind that if you have a config-override file in /sys then that may contain delta parameters that override the ones in config.sys.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

There's no config/override file in /sys

These are the files in that directory as received on the mico SD card with the kit.
FILE bed.g
FILE config.g
FILE config.heatbed.g
FILE deployprobe.g
FILE homeall.g
FILE homedelta.g
FILE homex.g
FILE homey.g
FILE homez.g
FILE iap.bin
FILE pause.g
FILE resume.g
FILE retractprobe.g
FILE stop.g
FILE tfree0.g
FILE tfree1.g
FILE tpost0.g
FILE tpost1.g
FILE tpre0.g
FILE tpre1.g

And the original config.g contents is

; Configuration file for RepRap Fisher - delta 3D printer

; Communication and general
M111 S0 ; Debug off
M550 Preprapfisher ; Machine name (can be anything you like)
M551 Preprap ; Machine password (used for FTP)
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0x01 ; MAC Address (must be unique on your network)
M552 P0.0.0.0 ; use DHCP
;M554 P192.168.1.1 ; Gateway
M553 P255.255.255.0 ; Netmask
M555 P2 ; Set output to look like Marlin
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Axis and motor configuration
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
M574 X2 Y2 Z2 S1 ; set endstop configuration (all endstops at high end, active high)
M665 R81.0 L160.0 B75 H164 ; set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0.0 ; put your endstop adjustments here
M92 X87.489 Y87.489 Z87.489 ; Set axis steps/mm
M906 X800 Y800 Z800 E1000 ; Set motor currents (mA)
M201 X4000 Y4000 Z4000 E4000 ; Accelerations (mm/s^2)
M203 X15000 Y15000 Z15000 E9000 ; Maximum speeds (mm/min)
M210 Z50 ; Homing feedrate
M566 X1200 Y1200 Z1200 E1200 ; Maximum instant speed changes mm/minute

; Thermistors
;M305 P0 R4700 T100000 ; Uncomment for heatbed
;M301 H0 P5 S0.7 ; Uncomment for heatbed
M305 P1 R4700

; Tool definitions
M140 H-1 ; Disable heatbed

M563 P0 D0 H1 ; Define tool 0
G10 P0 S210 R-273 ; Set tool 0 operating and standby temperatures
M301 H1 P12 I0.4 D80 W180 S0.6 B300 ; Set tool 0 PID parameters
M92 E310 ; Set extruder steps per mm

;// Z probe and compensation definition
M558 P4 X0 Y0 Z0 H4 ; Set Z probe type and dive height
G31 X0 Y0 Z0.0 P200 ; Set the zprobe height and threshold (put your own values here)

;*** If you are using axis compensation, put the figures in the following command
M556 S78 X0 Y0 Z0 ; Axis compensation here


I've checked the top switches and they are in the correct location/orientation
Thanks for your help.

When you press the bed down, does the Z probe reading in the web interface change from about 0 to about 1000 ?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Yes the probe down is working fine on all locations and changes as it should from 0 to 1000.
I'm using the commission procedure at
[emaker.io]

The heatbed upgrade turned up today and I've fitted it, re-named the config file to suit, still the same although it looks to be around 10mm now instead of 15 but still not low enough.

Latest.
If I set M665 H to 163 from the default 161 I can get the head down to 4mm.
I notice however the Z axis motor does not stop like the other two.
If you touch the spindle you can feel and hear it still trying to turn. (although it doesn't)
This lasts for around 30 seconds when it finally stops completely like the other 2.
Also should the rise to the top of each axis trigger the microswitches twice.
They go up, trigger the switch, do a little bounce then trigger them again before going down.

It's normal for the carriages to home twice. The second time is at a lower speed for greater accuracy. This behaviour is defined in the homedelta.g file.

All the motor currents are reduced to the idle percentage after 30 seconds. This is probably what you can feel on the Z motor.

Are you still getting error messages when you run auto calibration? Such as Z probe not triggered during the move, or already triggered at the start of the move?

Edited 1 time(s). Last edit at 05/26/2017 01:13AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].