Z endstop at high end should set Z position to maximum

A Former User · 27 Jul 2019, 20:35

The G92 command used to be commented out by default? But I experienced an issue where the config tool didn't generate a setup for Z limit switch when no Z probe was selected, this caused the Z position to be incorrect when homing.

Post your config.g and homing macros so we can see whats going on to help

thomas_rudloff · 28 Jul 2019, 06:44

Thanks,

then this might solve today. Actually I am integrating a Z Probe mechanism. I have three switches on the bed and want to probe the tool itself. The reason is that I have a 43mm mount where I want to mount a laser, an extruder or even a mill. Maybe you can point me to the direction (link) and save me a lot of time figuring this out.

A Former User · 28 Jul 2019, 18:09

You've been asked to post your actual config twice, and you don't seem to want to, that's fine, but that means you're wasting our time.

thomas_rudloff · 28 Jul 2019, 19:54

Sorry,

I am building up the machine. Since I do not get emails when a post arrives I look once a while here. Here is my latest config.

; Configuration file for Duet Maestro (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Sun Jul 28 2019 21:29:09 GMT+0200 (Central European Summer Time)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

M667 S1 ; Select CoreXY mode

; Network
M550 P"My Printer" ; Set machine name
M551 P"7072560" ; Set password
M552 P192.168.1.10 S1 ; Enable network and set IP address
M553 P255.255.0.0 ; Set netmask
M554 P0.0.0.0 ; Set gateway
M586 P0 S1 ; Enable HTTP
M586 P1 S1 ; Enable FTP
M586 P2 S1 ; Enable Telnet

; Drives
M569 P0 S0 ; Physical drive 0 goes backwards
M569 P1 S1 ; Physical drive 1 goes forwards
M569 P6 S0 ; Physical drive 6 goes backwards
M569 P3 S1 ; Physical drive 3 goes forwards
M569 P4 S1 ; Physical drive 4 goes forwards
M569 P5 S1 ; Physical drive 5 goes forwards
M584 X0 Y1 Z6 E3:4:5 ; Apply custom drive mapping
M350 X8 Y8 Z8 E8:8:8 I0 ; Configure microstepping without interpolation
M92 X160.00 Y160.00 Z1600.00 E635.69:635.69:635.69 ; Set steps per mm
M566 X900.00 Y900.00 Z90.00 E120.00:120.00:120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z300.00 E1200.00:1200.00:1200.00 ; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z1.00 E250.00:250.00:250.00 ; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z800.00 E800.00:800.00:800.00 ; Set motor currents (mA)
M84 S0 ; Disable motor idle current reduction

; Axis Limits
M208 X0 Y0 Z-155 S1 ; Set axis minima
M208 X200 Y160 Z0 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 Z2 S0 ; Set active low and disabled endstops

; Z-Probe
M558 P5 H5 F120 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X0:200 Y0:160 S20 ; Define mesh grid

; Heaters
M305 P0 X503 R ; Configure PT1000 for heater 0
M143 H0 S90 ; Set temperature limit for heater 0 to 90C

; Fans

; Tools
M563 P0 D0 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C
M563 P2 D2 ; Define tool 2
G10 P2 X0 Y0 Z0 ; Set tool 2 axis offsets
G10 P2 R0 S0 ; Set initial tool 2 active and standby temperatures to 0C

; Automatic saving after power loss is not enabled

; Custom settings
M555 P2 ; Set output to look like Marlin

; Miscellaneous
T0 ; Select first tool

I thought this board was ready to use. OK, I got this with 2.02RC5(RTOS) (2018-11-28b1) flashed. Should I go back to a release version? I cannot waste time to do software testing. I wanted a board ready to work, Now I connected the bed heater and a PT1000 and got an error that the termister is shorted. I meassure 1.1V at the input what is appropriate with a PT1000 and a 2.2k pullup resistor. It is the C-input. The bed input I did not find on the Maestro.

Phaedrux · 28 Jul 2019, 20:57

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

; Axis Limits
M208 X0 Y0 Z-155 S1 ; Set axis minima
M208 X200 Y160 Z0 S0 ; Set axis maxima

Your Z axis minima and maxima don't make any sense, so when you home to zmax you wont get a correct z position.

Phaedrux · 28 Jul 2019, 21:00

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

I got this with 2.02RC5(RTOS) (2018-11-28b1) flashed

Update to 2.03 by uploading this zip file as is on the settings page: https://github.com/dc42/RepRapFirmware/releases/download/2.03/Duet2Firmware-2.03.zip

Release notes etc here for reference:
https://github.com/dc42/RepRapFirmware/releases/tag/2.03

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

I cannot waste time to do software testing.

People who don't have time to do it right the first time must find time to do it right the second time.

deckingman · 28 Jul 2019, 21:57

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

I thought this board was ready to use. .............................

It is ready to use. And the first thing it does when you power it up is read the configuration from the SD card. Unfortunately that's the only way that the board can "know" what sort of printer you have and how it is configured. If that information is incorrect, it will misbehave.

A Former User · 28 Jul 2019, 21:59

I think he was refering to the board shipping with release candidate firmware as opposed to a stable release.

thomas_rudloff · 29 Jul 2019, 04:38

Thanks,

I thought of problems of the RC either and will try the release today. Last time I looked, this seemed to be the latest version. The problem is, that this is too complex to know everything at the beginning. I can do root cause analysis on aircraft electronic failures, but I am an absolute beginner on Duett. So please guide me.

Concerning the Z Axis settings: This was my latest setup. It has the advantage of setting the Z value to zero manually. The config tool does not set to maximum in any configuration I tried. Is the source code available? I will fix it myself if no one does.

It is to early to tweak the config files by hand. I still have to do some improvements on the hardware.

thomas_rudloff · 29 Jul 2019, 05:25

Flashed 2.03

PT1000 on C gives approx 1.1V and Error shorted sensor. Disconnecting the sensor gives a different error. Seems I am on the right port.

thomas_rudloff · 29 Jul 2019, 17:12

Deleting the malicious line from homez.g and homeall.g does the trick. DC42 mentioned somewhere that the firmware sets the value correct upon hitting the end stop. So no need to mess it up.

The PT1000 does not work on the bed thermistor input either. It tells a short when connected and an open circuit when disconnected. I measure a slightly different voltage. Does someone save a few Cents by not using 0.1% resistors or does the CPU have such a bad reference voltage?

Phaedrux · 29 Jul 2019, 18:41

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

Deleting the malicious line from homez.g and homeall.g does the trick.

What did you delete from the homing files?
Did you correct the z axis minima and maxima?

Phaedrux · 29 Jul 2019, 18:42

Is this on a meastro or wifi board?

thomas_rudloff · 29 Jul 2019, 21:12

Oh sorry, I need some practice on reporting here. It is a Maestro board. Now with the latest release software. Just for completeness.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Mon Jul 29 2019 18:46:55 GMT+0200 (Central European Summer Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Z165 F1800 ; move Z up until the endstop is triggered
;G92 Z0 ; set Z position to axis minimum (you may want to adjust this)

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

I set back the range to positive values from zero like it was before I started trying different configuration.

I have the three Z stepper on three external TB6600 (modified the opto-coupler of this garbage to make it work) and a 74HC245 as driver (the only suitable chip conrad had in stock) together with a fancy circuitry for synchronization at the Z stop I developed. But this was a mistake either. The board can do this better. I read today. So I will change this to the internal drive and use a TB6600 for the extruder. Or better the add on board. We will see. I hope I will find the article about Z axis synchronization with Z probing again. It looked like it was made for me.

en_passant · 30 Jul 2019, 00:07

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

Thanks,

I thought of problems of the RC either and will try the release today. Last time I looked, this seemed to be the latest version. The problem is, that this is too complex to know everything at the beginning. I can do root cause analysis on aircraft electronic failures, but I am an absolute beginner on Duett. So please guide me.

Concerning the Z Axis settings: This was my latest setup. It has the advantage of setting the Z value to zero manually. The config tool does not set to maximum in any configuration I tried. Is the source code available? I will fix it myself if no one does.

It is to early to tweak the config files by hand. I still have to do some improvements on the hardware.

Just picked this one up as it sounds similar to the issue I was having (feel free to look at my numerous posts vis a vis upgrading my board/ firmware/ gcode #basically-a-new-printer) and really must say... oh. my. god.

Between the wikis and the forums, this place is an absolute treasure trove of information! The folks here have cultivated/ created/ generated one of the best open-source resources (personally) I've ever seen. The participation from people a) willing to help and b) able to help is outstanding; without having to wait 3 weeks for the 1 guy who doesn't have his arse facing the sky to send a semi-helpful reply.

remember this is open-source and has multiple applications and many many many more methods of doing so;
remember you're free to chose another platform (if you're struggling with duet, go have fun with octoprint...);
ask nicely and show some humility - coming here (where resides some clever folks from my observations) throwing the bosses weekly buzzwords like RCA isn't going to win you any favours and either is banging the drum about aircraft electronics like it's going to impress anyone

... fortunately, the people with the noodles are so nice they continue to help regardless

e_p
just-another-newcomer-seeking-help, CEng RAeS [... Avionics, hehe ]

Phaedrux · 30 Jul 2019, 04:46

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

M305 P0 X503 R ; Configure PT1000 for heater 0

I think your PT1000 config line is missing some parameters.

https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors

thomas_rudloff · 30 Jul 2019, 08:58

Oh, now I see it thanks. I chose the PT1000 because, if I understood right what I read, are supported without adapter and was able to buy some at Conrad on a Saturday. Meanwhile I ordered a thermocouple adapter board, that is, hopefully, on the way today. I have K-types at home. Now I recall that printers usually use 100k NTC for the bed. Is this the NTC the way to go for best serviceability? Precission is not that much an issue on my opinion, because you need to tweak to filament and bed anyway.

A Former User · 30 Jul 2019, 09:15

@thomas_rudloff said in Z endstop at high end should set Z position to maximum:

Oh, now I see it thanks. I chose the PT1000 because, if I understood right what I read, are supported without adapter and was able to buy some at Conrad on a Saturday. Meanwhile I ordered a thermocouple adapter board, that is, hopefully, on the way today. I have K-types at home. Now I recall that printers usually use 100k NTC for the bed. Is this the NTC the way to go for best serviceability? Precission is not that much an issue on my opinion, because you need to tweak to filament and bed anyway.

NTC and PT1000 are both supported without adapters. Thermocouple and PT100 adapter boards are available. Its mainly a question of accuracy, operating temperature and cost, pick two type of deal.

Oh sorry, I need some practice on reporting here

You'll find most of this applicable to the internet and life in general as well; https://forum.duet3d.com/topic/5909/guide-for-posting-requests-for-help

nophead · 30 Jul 2019, 10:28

@thomas_rudloff NTCs are fine for beds. I use 1% Epcos B57861S104F40 epoxy bead thermistors that come with PTFE covered leads. I attach them with JB-Weld.

At typical bed temperatures 1% is only a degree or so so I don't see any point in being more accurate. It would be a good bed that has less temperature difference across its surface.

thomas_rudloff · 30 Jul 2019, 19:31

Thanks to all

Just deleting the R does the trick. I read somewhere that on newer boards the defaults are OK.