First video of my Liteplacer mod in a small test run with the smallest and largest part

[ma...@makr.zone]

Hi

Finally I got my Liteplacer + OpenPNP mod mostly operational. Here are the first few specs:

• Using the great OpenPNP Software
• Proven mechanical kit by Liteplacer
• 750mm Y Axis (instead of standard 500mm)
• Y motor upgraded to NEMA23
• X motor exchanged for faster 1.8° stepper
• Smoothieware firmware
• Azteeg X5 GT controller (+ donation to Smoothieware)
• Trinamic TMC2660 stepper drivers (+ tons of much-needed tuning)
• MPXV5050VC6T1 vacuum sensor
• 2 x ELP 6mm 2MP Full HD High Speed MJPEG USB Camera Module 
• Z Probing in Liteplacer style (no part heights needed)
• Open frame base design (with some extras …)
• Sunken nozzle tip holder, flush with bed (banged it too many times)
• A surprising amount of work, brutal learning curves, at times a roller-coaster of emotions!

I hope to document all this much more and I will post all my config once it is really working in earnest.

The test run uses all the vision features just as a demo. Small parts (only tried 0603) can be reasonably placed without feeder and bottom vision (well, that was before I badly banged my nozzle tip holder… new is one ordered).

All comments very welcome!

https://youtu.be/poLwQDpfeJ8

For future reference:
https://makr.zone/pick-place-machine-first-simulated-small-test-run/66/

_Mark

[Sebastian Pichelhofer]

Lovely work!

What results are you getting in terms of placement accuracy?

Regards Sebastian

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[alexander...@gmail.com]

This looks very good... I look forward to further details as you write them up... do you plan to add any auto feeders at all?

[ma...@makr.zone]

>What results are you getting in terms of placement accuracy?

I can't really be sure at the moment. Two things to sort out first:

1. My nozzle tip holder is badly bent, banged it hard, has terrible run-out (a new one is ordered). So at the moment I need pre-rotate + bottom vision at all times. This works as long my A motor is always powered on at the same angle. Otherwise the camera to nozzle tip offset is of course wrong.
2. I have no fiducials on my PCB and sadly also only one good corner as reference (old design to be hand assembled). So the PCB is just aligned to the 0,0 corner for now (but it is angled a bit).
   

This is what I get somewhere near the 0,0 corner of the PCB.



However judging just from the camera, the precision is better than that. I'm always bang on features I captured before. I mean really cross-hairs right on the tiniest speck.

How this will translate to vision-less placement once I got my fresh nozzle holder, I can't say.

_Mark

[ma...@makr.zone]

> do you plan to add any auto feeders at all?

Well the open frame is open at the front too for all future options :-)

A full auto-feeder seems too complicated at the moment. A drag feeder perhaps. Who says it has to drag only one part per serving? A strip feeder in some guide rails with "drag-to-reload" could be quite efficient, I guess.

_Mark

[Jt Whissel]

How did you get the "Z Probing in Liteplacer style" working. I just finished my liteplacer build and looking to switch to OpenPnP for the up camera part calibration. 

[ma...@makr.zone]

Hi

 

How did you get the "Z Probing in Liteplacer style" working. I just finished my liteplacer build and looking to switch to OpenPnP for the up camera part calibration.

DISCLAIMER:

be aware that I’ve never placed parts on solder paste (just on sticky tape for now). So I don’t know if it really works or if it will just spray solder paste! That's why I'm not ready yet to publish everything :)

First you need to configure Z-Probing in Smoothieware.

Then I have the follwing G Code fragments.

    <command head-mountable-id="N1" type="PICK_COMMAND">
            <text><![CDATA[G38.2 Z-20    ; Probe down for picked part]]></text>
            <text><![CDATA[M105          ; Report the vacuum - for log only]]></text>
            <text><![CDATA[M10           ; Open solenoid valve]]></text>
            <text><![CDATA[G4 P200       ; wait for nozzle to build up vacuum]]></text>
            <text><![CDATA[M105          ; Report the vacuum - for log only]]></text>
            <text><![CDATA[G91           ; Switch to relative mode]]></text>
            <text><![CDATA[G1 Z8         ; Move back up 8mm to clear the spring loaded nozzle tip]]></text>
            <text><![CDATA[G90           ; Switch back to absolute mode - OpenPNP will restore a known Z height with the upcoming Safe Z move]]></text>
            <text><![CDATA[G4 P200       ; wait for the vacuum level to establish - it will be measured next]]></text>
         </command>
         <command head-mountable-id="N1" type="PLACE_COMMAND">
            <text><![CDATA[G38.2 Z-40    ; Probe down for placing/discarding part]]></text>
            <text><![CDATA[M105          ; Report the vacuum - for log only]]></text>
            <text><![CDATA[M11           ; Close solenoid valve]]></text>
            <text><![CDATA[G4 P200       ; wait for nozzle to lose vacuum]]></text>
            <text><![CDATA[M105          ; Report the vacuum - for log only]]></text>
            <text><![CDATA[G91           ; Switch to relative mode]]></text>
            <text><![CDATA[G1 Z8         ; Move back up 8mm to clear the spring loaded nozzle tip.]]></text>
            <text><![CDATA[G90           ; Switch back to absolute mode]]></text>
            <text><![CDATA[G4 P200       ; wait for the vacuum level to establish - it will be measured next]]></text>
         </command>

Does this help?

_Mark

 

 

 

 

[jt whissel]

Definitely gives me the idea of your approach. Was it worth the switch to OpenPnP vs Liteplacer?

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[ma...@makr.zone]

Was it worth the switch to OpenPnP vs Liteplacer?

OpenPNP was a clear choice first. Then I started looking for a machine. So I never even tried the Liteplacer software. 

Bottom vision seemed an obvious must for me.

_Mark

[Jt Whissel]

Can you take some pictures and show how you hooked up and got the vacuum sensor up and running?

[ma...@makr.zone]

Hi Jt

have you seen this?

https://makr.zone/vacuum-sensor/192/

I will be documenting my full wiring and everything else, but I'd like to do it right when it is really finished and working with real solder paste.

But I'm happy to help with specific questions, just please be more specific.:)

_Mark

[Jt Whissel]

I did not know you had that up. Great information, thank you very much.