Posts made by ThatBigPrint

@joergs5 fantastic, let the build bein pictures to follow; I can duplicate the mechanical parts to thank you for helping I don't have super long to do this project as I need it running.

I started work already on paste dispensing with a modded delta printer, but I can transfer that extruder across for that function.

The flying test looks good. Has open PNP got that function? I just designed pogo boards for what I make with on board esp to interrogate the pins of the subject board...

So do we have the makings of config code I can dump on?

@joergs5 well i have started already started stripping the rv4s just for visual info mike has done good vid of overall operation of the rv4s https://www.youtube.com/watch?v=ZaqvEftw7aI

plan is remove the original motors two that operate the main arm with large pulleys in the base (huge 5 phase steppers super noisy) and some more nema 17 size motors that deal with the nozzle and one that lifts nozzle/ camera (again 5 phase)

i will be attempting to replace most if not all of the motors with clear path servo motors and worse case use 0.9 deg steppers and use duets drivers

few things I'm for sure not sure about, the feeders ? where is the section to adjust commands to them they are simple serial devises and we have the original coms structure for them although i may hack them up as well and replace with arduino as they are noisy and way too aggressive for plastic tape

the other item i kind of want to retain is the flying camera but i presume that is almost impossible just due to the complex maths involved regarding rotation of the camera given its essentially attached to the joint 2 arm as you may tell from mikes vid above ?

so what duet do you think i will need ? i already have a few duet 2 boards or do i need more processing power ?

@joergs5 thanks for the info, do you know if he got it finished, in the end, hit GitHub says it's still got issues?

also regarding RRF, correct me if I'm wrong but the duet or scare would just be a serial "3d printer" as far as open PNP is concerned? and you just send it gcode coordinates

Any help, guys?

Hi guys, it's been a while...

I'm planning on converting my scars and pick and place one to duet and open pnp, my main concern is the orientation of the pick head effectively the end effector, is there a simple solution to this? Mechanical side, there is already a stepper orientation for the nozzle

Also, for reference, the machine is an old RV4s; the reason for converting is the software is somewhat deprecated also planning to convert to a clear path servo as the original steppers are 5 phase noisy units aside from the z-axis and nozzle

Any help would be appreciated

@dc42 said in consistent layer shift in both x/y using clear-path servos ?:

The last one is direction hold time after the step pulse leading edge.

would this being set to zero previously cause the issues i was having ?

@nhof how do i upload pictures ?

Thanks both of you i have got it to perform better now setting t values to

T1.25:1.25:1.25:1.25 what is the end value for the one that is zero in aforementioned example ?

If 1:1:25:0 works but 1:1:0.5:0 doesn't work, try something like 1:1:1:0 or 1:1:2:0.

i thought it was set up time or stop delay ?

Right guys i have revisited the printer so things i have done so far

added io expansion board in a sinking 5v style control for step direction and enable

tried adjusting the m569 values

but i get the same issue the centre of the bed is closer to the nozzle than the perimeter i have mechanically levelled bed as best as i can the z motor has now got significant gear reduction now dimensionally the printer movers are accurate as individual entities but both mesh levelling and bed levelling are not doing as intended.... the motor is moving as though its attempting to level but it feels a bit rough in its movements as in it jerks not smooth

not sure what to try next i have had better success with t values all set to 4 but this adds ringing.... i have used recommended settings suggested by mr DC42

"The setup time is 25ns not 25us, so instead of 1:1:25:1 I suggest 1:1:0.5:0 in the M569 T parameter. My suggestion to use 0.5us setup time is to allow for possible skew in the opto isolators."

but i get constant skipped layers in x and y immediately as in shell is printed and fill is not within the boundary

@dc42 tried a smaller constrained mesh but no luck its ok for now using 5 point level as the plate is flat tooling plate just how its mounted will not allow for adjustment prints are coming out perfectly flat now

just need to work on quality now

@nhof i have moved away from grid and gone to 5 point bed level now works fine think it was the probe picking up the edge of the printbite ?

@dc42 apologies for late reply reason for doing this is because it looks cleaner in terms of cable management but if it is causing me aforementioned issues I will go to flat flex expansion header

so i am still having the issue where the bed for whatever reason is not remaining level ie goes through probing etc starts printing (you can see it adjusting z) suggesting its trying to work but one end for the print (600x600x20mm) the layer fades out completely and the other end the layer is fine ?

below are my current settings gone way higher on the t values to no avail?

Taa:bb:cc:dd (firmware 1.21 and later) Minimum driver step pulse width, step pulse interval, direction setup time and direction hold time, in microseconds

; Drives
M569 P0 S1 T10:5:1:1
M569 P1 S1 T10:5:1:1
M569 P2 S0 T10:5:1:1
M569 P3 S0
M350 X16 Y16 Z16 E16 ; Configure microstepping with interpolation
M92 X26.676 Y26.676 Z89.233 E804.81 ; Set steps per mm
M566 X1500 Y1500 Z900 E1500 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z2000 E2000 ; Set maximum speeds (mm/min)
M201 X800 Y800 Z500 E250 ; Set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

getting pretty desperate now as work needed to go to another company to get 2 done at a huge cost to them

layer hight may also be inaccurate but not sure on that as the test cube i print appears to be over extruding but the actual extrusion is spot on ?

also, I have looked at ways of testing the repeatability of the bed probe but not much info for the duet i did try the.....

;prob testing single point.
G30 P0 X200 Y200 Z-99999 F2000
G30 P1 X200 Y200 Z-99999 F2000
G30 P2 X200 Y200 Z-99999 F2000

method but it errors out at the end?

@nhof apologies for the late reply i have sorted most of the surface finish issues (single wall with an 8mm nozzle and doing infill first) and as for motors mine are 800 count or the lesser model... and for tuning, I had locked down the opposite motor shaft and run the auto-tune feature they seem to be behaving z-axis is a tiny bit noisy but I can tune that in better later this weekend when I have uninterrupted time i think its duet to weight and the fact its belt drive through a jackshaft (totally unideal but easy/cheap for a super quick turn around) but in theory i can wack up the motor counts per rev and have it actually be more accurate ? i had initially thought this would just make the motors always hunt too much?

@timothyz i will be going to a planetary reduction gearbox on all axis although I'm apprehensive due to clearpaths odd choice of motor shaft? the jackshaft on z was a last min thing as a workaround seems to be doing ok so far for a printed pulley moving around 20mm of tooling plate

@dc42 will this be the case for the super early duet wifis ? as in ones without motor feedback? and if not will there be a firmware workaround ? or just don't upgrade?

Right chaps i have modded the servo enables so now they are all always fed from the 5v supply, and the prints appear to be coming out parallel now so getting there one thing I have noticed is that the model exterior is not so smooth is there a way I can up the resolution? its almost like it has a pattern on the outer surface.

@dc42 for the z i have skipped the enable and soldered into 5v so the z is always enabled i will probs do this to the rest in that case ?

just checked nozzle hight where it homes with the probe and the z height is spot on but the thing wong mesh level ! still says as above error but dimensionally, in theory, it's not changed? checked 100mm and it repeats spot on also ?

and i have adjusted the dive hight

[link text]; Configuration file for Duet 0.8.5 (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Thu May 17 2018 19:23:49 GMT+0100 (BST)

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

M667 S1 ; Select CoreXY mode

; Network
M550 PMy printer ; Set machine name
M552 S1 ; Enable network and acquire dynamic address via DHCP
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
; Drives
M569 P0 S1 T1:2:0.25:1
M569 P1 S1 T1:2:0.25:1
M569 P2 S0 T1:2:0.25:1
M569 P3 S0
M350 X16 Y16 Z16 E16 ; Configure microstepping with interpolation
M92 X28.366 Y28.366 Z93.82 E804.81 ; Set steps per mm
M566 X1500 Y1500 Z900 E1500 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z2000 E2000 ; Set maximum speeds (mm/min)
M201 X800 Y800 Z500 E250 ; Set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z-5 S1 ; Set axis minima
M208 X462 Y500 Z560 S0 ; Set axis maxima

; Endstops
M574 X2 Y2 S0 ; Set active high endstops

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 H15 F220 T6000 I1 ; Set Z probe type to modulated and the dive height + speeds
G31 P600 X-20 Y-42 Z1.3 ; Set Z probe trigger value, offset and trigger height
M557 X15:447 Y15:485 S100 ; Define mesh grid

; Heaters
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S135 ; Set temperature limit for heater 0 to 135C
M305 P1 T100000 B4138 C0 R4700 X150 ; Set thermistor + ADC parameters for heater 1 and remap it to channel 100
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T75 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S50 ; Set initial tool 0 active and standby temperatures to 0C

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory
T0 (link url)

so we may be getting somewhere.... so my bad i did not hit save for the original setting s you suggested but we steps per mm are now messed up no big deal recalibrated those (suppose this is what we want to see ?) only thing is the probe distance "Error: Z probe was not triggered during probing move" is all kaput and the homing distances have changed but if i command 100mm it moves 100mm in all 3 axis ? surely 100mm before is 100mm now ?

hmm still just as bad with prev settings i will try upping to 5 as you stated