@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 ?

@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