Homing after nozzle change

[korsm...@gmail.com]

Hi,

Can openpnp be set that it performs a homing after nozzle change? However accurate I set everything (PS the speed setting does nothing in the nozzle bank) i get the feeling that after a nozzle change, some settings are off.

At the end of most of my PCB's. it takes a bigger nozzle and start placing the chips. I would love that it would do:

- Take a now nozzle.

- Home cycle (how?)

- Calibrate nozzle

- Perform a fiducial check again (how??)

- place (with vision) the chip(s).

So also, is there a setting to perform for certain xomponents an extra fiducial check.. I always thought there was, but cna not find it.

Accuracy is more important than speed for me....

[mark maker]

Hi,

First you should really, really try to solve the underlying issue. The only reason I see for that behaviour would be the steppers losing steps in the changer motion. There are tons of things to check, like stepper current, more precise load/unload motion capture, making the loader more "permissive" by adding flex etc.

Maybe changer vision can help make the changing motion more precise:
https://github.com/openpnp/openpnp/wiki/Nozzle-Tip-Changer#vision-calibration

Video about changer vision (among other stuff):
https://youtu.be/9uFxV1-vnXw

Also make sure to enable nozzle tip calibration after each nozzle tip change.

If all else fails, you could add a visual homing through the

NozzleTip.Loaded

script. Something like that (draft pseudo code à la Java):

ReferenceHead head = (ReferenceHead)Configuration.get().getMachine().getDefaultHead();

head.visualHome(head.getMachine(), true);

I would not recommend full homing, just visual homing, as full homing resets too much.

_Mark

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[korsm...@gmail.com]

Hi Mark,

I am going to try to optimise it with your tips.. Thanks.. But, to be sure, I still want to add the homing..

maybe I just do not have the best motors or card, but also bought it secondhand a long time ago.. I would like a new card, because I also miss vaccuum recognition (I have all the parts but the wrong gcode card it seems).

Ayway,  I am searching but where can i find the part where i can input the nozzletip. loaded section? I am going through the program and the XML configuration files but I have no clue where to find it.. Sorry for asking maybe a stupid question (and yes, they do exist :) ) 

PS, I am a vb programmer so Java is completely liek a foreign language.. No clue at all... :).

Op maandag 11 september 2023 om 14:46:38 UTC+2 schreef ma...@makr.zone:

[mark maker]

See the Wiki:

https://github.com/openpnp/openpnp/wiki/Scripting

_Mark

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/ecd26fb3-bcea-477f-be97-98851fa32a75n%40googlegroups.com.

[korsm...@gmail.com]

Hi Mark,

Thanks for the good and fast input.. I did not know of the scripts but that is nice... while I do not know anything about Java, it was not easy but I managed.

I used:

 ReferenceHead = machine.getDefaultHead();

ReferenceHead.visualHome(machine,true);

Op dinsdag 12 september 2023 om 12:53:58 UTC+2 schreef ma...@makr.zone: