Posts made by DigiD

@DigitalElf
I realize this post is 3 months old but thought for other CNC users looking to isolate their NPN Axis End Stop switches this might be of use , protoboard and opto isolators cost $15 , this is for a duet2 wifi

opto isolator x 4 on my Delta , allows you to use what ever voltage the sensor works best with ( in my case 24volts) , isolates the high voltage from the low , decouples any kind of line noise from steppers etc and doesn't toast the board if you plug it in backwards

in config file use

M574 X2 S1 P"!xstop" ; configure active low endstop for high end on X via pin xstop !prefix

@wombat37
I didn’t measure R with a meter , I solved it using the thermistor values in config and what the actual temperature was at the hot end with a thermocouple . The spreadsheet there should explain how I did it . Doing it that way you take into account all the stacking errors at the temp range of interest

Look forward to trying your method

Cheers

@wombat37

I’m interested

only worked out the first 2 of the 3 using this method
https://forum.duet3d.com/post/191523

@alankilian
This is the system used by shopbottools cnc

Pretty well exactly as you described

https://www.orientalmotor.com/stepper-motors/alphastep-closed-loop-stepper-motors.html

Re: Issues with Forum

I see some Russian in one of the drop down menus .

https://forum.duet3d.com/category/2/general-discussion

using the above link and go over to the right and click "Sort By"

there are two similar lines

the first one , do you see "Начиная с новых тем"?

tried two different computers Edge, Firefox and Opera all report the same ,

@fcwilt

LJ12A3-4-Z/BX Inductive Proximity sensor NPN (OMRON and no name brands seem to work equally well) , very common on Ebay about $3-4 AUD each

4mm sensing distance , best results using mild steel as a target that is close to the diameter of the sensor . derate sense distance for stainless .7 and Aluminium .4

been in the printer for a few years now with out any issues

I use first pass fast coarse and second pass slower accurate for homing

@reFlexlab

opto isolator x 4 on my Delta , allows you to use what ever voltage the sensor works best with ( in my case 24volts) , isolates the high voltage from the low , decouples any kind of line noise from steppers etc and doesn't toast the board if you plug it in backwards

in config file use

M574 X2 S1 P"!xstop" ; configure active low endstop for high end on X via pin xstop !prefix

@fcwilt

This is the method I used , probably could be refined a bit but for me it was close enough

https://forum.duet3d.com/post/191523

This looks similar to a problem experienced in the UV ink print industry when printing older new media vs fresh new media ( both never used and in sealed bags) plastizers in the older media migrate to the print surface causing unexpected print results .

Turns out PLA uses all kinds of plastizers as well and they also can change wildly over time depending on what plastizer is actually used , which may explain what your experiencing

I went down a rabbit hole of info , this one was an interesting read

Printability, Mechanical and Thermal Properties of Poly(3-Hydroxybutyrate)-Poly(Lactic Acid)-Plasticizer Blends for Three-Dimensional (3D) Printing

First I reckon everyone that has Duet board and is building a printer should have a decent multi meter with a K type thermocouple ( bead type preferred)

If you have a decent meter and thermo couple you can try this method

Loosen the screw that keeps the thermistor captured in the heater block . Slip the bead of the thermocouple under the washer and tighten slightly . You want good contact .

Pick your temp range of interest, for me it was 180 to 235 C

In Duet control Set 180 ,220 and 235 and with the meter measure actual temps for each value

You know the Steinhart model values as used in the Config file .

For each of the set temps calculate the resistance the Duet is trying to reach for each temp set in the controller using that model

see attached excel file

with calculated resistance and the correct measured temperatures goto the ThinkSRS page and recalculate R and B

It worked for me . for 180 to 235 temp deviation is only about 1 degree , originally at top end it was 10 . Room temp is a different story that's out by 10 , I get 35 instead of 25 and for me that doesn't matter

would be interested to know if this method works for others.

Steinhart temp to resistance.xls

@TheGov

If I had to design a brake for that Z axis I would mount the solenoid on that rail the motor is attached to and then have the Pawl on the left shaft . Design and print a Pawl cam and mate it to a GT2 20 or 30 tooth sprocket that has grub screws to fix it to the shaft and design and print an interference tooth for the end of the solenoid . Since its all plastic I would use surface areas as wide as possible . Its just a rough idea but I would attempt something like this

those flanges for the GT pulley apparently are not that hard to take off and put back on again once that printed piece is fitted on

@TheGov

Have you considered using a simple mechanical brake ?

Below is what is essentially used on a large industrial cutting machine that has knives loaded on the z Axis . (its a cutter I have worked on)

During initialization of the cutting heads the cams turn counter clockwise releasing pressure on the solenoid that is powered by the DC power supply and it pulls out of the way . Z can now work in both directions . On any loss of power the solenoid drops out and catches the pawl in an 1/8th of a turn preventing the knives dropping into the table. Its a simple reliable system . Occasionally the solenoids fail , in 10 years over a 100 machines maybe 4 have been replaced. 3 burned out and 1 had some dirt /debris stopping it from engaging the pawl

@Phaedrux

checked general settings "Duet Web Control 3.1.1"

Just for the heck of it I wrapped the flat cable in aluminium foil about 6 layers or so and then covered that with some captan tape to avoid disaster then a bulldog clip to clamp the foiled cable to the frame . Measured about 24 ohms from connector end to frame for a shield 22cm long. No change in file behaviour

I can live with the way it is for now . It was nice though to be able to use the card 1, I preferred leaving the system SD card 0 alone as much as possible

@Phaedrux

for Panel Due I used "PanelDue-v3-4.3.bin", display has the small daughter board plugged into it with USB and reset and erase. I purchased the Display from Duet3D when they were running the last of them out

WIFI server was 1.23 and I believe is latest , just downloaded "DuetWebControl-SD-3.1.1.zip" and uploaded via Upload System Files and then ran command M997 S1 to re install the firmware. Still get 1.23 as version. That correct?

@Phaedrux

Cable is 25 cm long , more or less routed at 90 degrees past end stop signal wires and about 3cm away and parallel for about 3cm to the unshielded heater and power lines , all the stepper motor cables are shielded and with shields grounded to frame .Same as it was in RRF2.05

Tried disconnecting the 4 pin panel data cable and just connected via the flat cable . Did not make a difference

I can upload a large file but only after a reboot and remount , any files after that fail .

if I try and print from SD 1 I still get file not found

OK on 1.24 and dark mode

I can upload files now but it still complains about being unable to read headers and footers

going to erase SD and try again

Thank you
I missed that , It is Version 1.17

And I have to pull it out to reprogram.

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

I didn't leave a hole in the case for usb .

The extra 4GB SD card in the Panel Due display worked with out trouble in RRF2.05 on my Duet Wifi.

After upgrading to 3.1.1 from 2.05 it now fails.

I tried reformatting the SD card as per the suggested SD fomat tool and the SD card is formatted as FAT (16) for 4gb and smaller as suggested in documention.

I can mount SD 1
I have been able to upload one small file a 50 x 50 test square 98.5k file
Can not load any other files via "Upload G-code files" , get "failed to upload network error"
If I try to print the one file on SD1 I get "M32 "1:50mm x50mm test sq.gcode" not found

If I remove the SD card and put it back again with changed files and hit refresh it shows no jobs ,
also it complains that it
cannot get file info "operation failed (reason: err 1)
Error:Cannot read file, error code 1
Error: Failed to read footer from g-code file

If I reboot printer and remount SD1 it shows the file names successfully , but with a "response too long see console"

Error: Cannot read file, error code 1
Error: Failed to read header of G-Code file "1:/50mm x 50mm test sq.gcode"
Error: Cannot read file, error code 1
Error: Failed to read header of G-Code file "1:/Trellis Connector T.gcode"

I can upload files with out trouble to SD 0 ,the on board micro SD and print those successfully .

m122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.1.1 running on Duet WiFi 1.02 or later
Board ID: 08DGM-956GU-DJMSN-6J1DD-3SJ6K-1ANHF
Used output buffers: 3 of 24 (13 max)
=== RTOS ===
Static ram: 27980
Dynamic ram: 92952 of which 44 recycled
Exception stack ram used: 304
Never used ram: 9792
Tasks: NETWORK(ready,284) HEAT(blocked,1224) MAIN(running,1880) IDLE(ready,80)
Owned mutexes:
=== Platform ===
Last reset 00:06:15 ago, cause: power up
Last software reset at 2020-09-21 01:44, reason: User, spinning module GCodes, available RAM 9544 bytes (slot 3)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task MAIN
Error status: 0
MCU temperature: min 33.1, current 35.6, max 36.8
Supply voltage: min 24.4, current 24.6, max 24.8, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max not available
Driver 1: standstill, SG min/max not available
Driver 2: standstill, SG min/max not available
Driver 3: standstill, SG min/max not available
Driver 4: standstill, SG min/max not available
Date/time: 2020-09-21 15:47:38
Cache data hit count 648880227
Slowest loop: 899.60ms; fastest: 0.12ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 4.5ms, write time 0.0ms, max retries 0
=== Move ===
Hiccups: 0(0), FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
Bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
=== AuxDDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 716.79ms; fastest: 0.00ms
Responder states: HTTP(2) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8

• WiFi -
  Network state is active
  WiFi module is connected to access point
  Failed messages: pending 0, notready 0, noresp 0
  WiFi firmware version 1.23
  WiFi MAC address 60:01:94:73:58:8f
  WiFi Vcc 3.31, reset reason Unknown
  WiFi flash size 4194304, free heap 20160
  WiFi IP address 10.1.1.222
  WiFi signal strength -64dBm, reconnections 0, sleep mode modem
  Socket states: 0 0 0 0 0 0 0 0

#############################################
#############################################

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Sep 19 2020 10:37:56 GMT+1000 (Australian Eastern Standard Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Trium Duet3D 3V1.1" ; set printer name
;Diagonals 288.160:288.170:288.160, delta radius 145.243, homed height 407.792, bed radius 105.0, X -0.032°, Y 0.027°, Z 0.000°
M665 R145.300 L288.16:288.17:288.16 H408.00 B105.00 X-0.030 Y0.030 Z0.000 ; Set delta radius, diagonal rod length, printable radius and homed height
;Endstop adjustments X-0.07 Y0.17 Z-0.10, tilt X0.00% Y0.00%
M666 X-0.07 Y0.17 Z-0.10 X0 Y0 ; put your endstop adjustments here, or let auto calibration find them

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z160.00 E439.75 ; set steps per mm
M566 X1080.00 Y1080.00 Z1080.00 E3600.00 ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z12000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z1500.00 E2000.00 ; set accelerations (mm/s^2)
M906 X1600 Y1600 Z1600 E1250 I50 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 Z0.0125 S1 ; set minimum Z

; Endstops
M574 X2 S1 P"!xstop" ; configure active low endstop for high end on X via pin xstop !prefix
M574 Y2 S1 P"!ystop" ; configure active low endstop for high end on Y via pin ystop
M574 Z2 S1 P"!zstop" ; configure active low endstop for high end on Z via pin zstop

; Z-Probe
M558 P5 C"e0stop" H2.5 F120 T4000 ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z28.48 ; set Z probe trigger value, offset and trigger height
M557 R100 P6:6 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 A110 C422.4 D1.1 S1.0 V24.6 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B3950 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 A451.0, C96.0, D4.7 S1 V24.5 ; disable bang-bang mode for heater and set PWM limit

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T60 ; set heat break fan1 value. Thermostatic control is turned on

; Tools
M563 P0 S"EXT 1" D0 H1 F0 ; 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

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
;M501 ; load saved parameters from non-volatile memory

@jens55
I greased the large white nylon gear , same one that slipped .

Just enough to coat the gear teeth with out globs hanging off going around and around

I used a silicon based one that is fairly plastic friendly called superlube

Edit :
Clone usage details , purchased in May 2019 for 25AUD printed somewhere between 2-3kg PLA before it failed