Calibration Issue

[Nicolas Krause]

Hi All,

We purchased our CHMT36 a year ago for some prototyping and low volume production and I'm just working through getting it all setup. There were some error messages that the y-axis was losing steps, but I turned on the encoder and turned down the acceleration for the motors (to 40%) in the secret menu and the machine seems more reliable.

The current issue I have is I can't seem to place my resistor on my board at the correct location. I'm a little mystified as when I check the position of the part in the file before starting a run, the crosshairs are in the correct location. The machine picks the 0603 resistor, moves to place it, and then does not place it in the correct location. Any assistance would be greatly appreciated!

Nicolas

[Garrett G]

Shot in the dark, but you might increase acceleration to something >50%. If you turn down the placement speed to <50% the machine looses it's mind and starts behaving strangely. The same might possibly be true with the acceleration values?

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[Nicolas Krause]

I'll give that a go for sure, the other question I had was some of the points for the tape pickup were providing negative values in the x/y coordinates, should I avoid those locations in the tape feeder? I've seen various people say negative values cause problems with the machine. 

[William]

Hi Nicolas,

There are a few good overview tutorials that might help you reach your goals sooner.

I found this link helpful.

Sent from my iPhone

On Aug 10, 2023, at 2:55 PM, Nicolas Krause <nicolas...@gmail.com> wrote:

Hi All,

We purchased our CHMT36 a year ago for some prototyping and low volume production and I'm just working through getting it all setup. There were some error messages that the y-axis was losing steps, but I turned on the encoder and turned down the acceleration for the motors (to 40%) in the secret menu and the machine seems more reliable.

The current issue I have is I can't seem to place my resistor on my board at the correct location. I'm a little mystified as when I check the position of the part in the file before starting a run, the crosshairs are in the correct location. The machine picks the 0603 resistor, moves to place it, and then does not place it in the correct location. Any assistance would be greatly appreciated!

Nicolas

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[Ray Jones]

Ooooh, get all excited, a github repo.
Sees last check in dates is 3 years ago, feels abandonment.

Not to say the info is useless, but support is not all that different to my now 3 year old unit, take the money and run does come to mind.

To view this discussion on the web visit https://groups.google.com/d/msgid/desktop-pick-and-place/BF0768C8-02A5-4D3B-8873-1C98BD3A172C%40gmail.com.

[William]

Yeah,

I found some of the information useful when a got started a couple of years ago. My machine has not changed much since I’ve received it about 3 years ago. 

Maybe it will help to look at the placement files and verify how to input co-ordinates etc… “The Basics”.

Sent from my iPhone

On Aug 10, 2023, at 5:00 PM, Ray Jones <mrjone...@gmail.com> wrote:



Ooooh, get all excited, a github repo.
Sees last check in dates is 3 years ago, feels abandonment.

Not to say the info is useless, but support is not all that different to my now 3 year old unit, take the money and run does come to mind.

On Fri, 11 Aug 2023 at 07:47, William <wdougl...@gmail.com> wrote:

Hi Nicolas,

There are a few good overview tutorials that might help you reach your goals sooner.

I found this link helpful.

Sent from my iPhone

On Aug 10, 2023, at 2:55 PM, Nicolas Krause <nicolas...@gmail.com> wrote:

Hi All,

We purchased our CHMT36 a year ago for some prototyping and low volume production and I'm just working through getting it all setup. There were some error messages that the y-axis was losing steps, but I turned on the encoder and turned down the acceleration for the motors (to 40%) in the secret menu and the machine seems more reliable.

The current issue I have is I can't seem to place my resistor on my board at the correct location. I'm a little mystified as when I check the position of the part in the file before starting a run, the crosshairs are in the correct location. The machine picks the 0603 resistor, moves to place it, and then does not place it in the correct location. Any assistance would be greatly appreciated!

Nicolas

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[Hank Kauffmann]

Some food for thought.

I thought Charmhigh didn't like negative XYs in the part placement. I shifted everything so none of the values were negative.

A known problem is related to items with an orientation of 180. If the camera sees the part at 181 degrees, then the part is rotated by 359 degrees to try to fix its angle. This could unseat the part on the nozzle and it would fall off or be left worse off than before,   My solution to this was to rotate my non-polarized parts (Cs and Rs) so they were between 270 (-90) and 90.

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[Ashwin Abhang]

first of all, calibrate your top camera, bottom camera, nozzel position. then set pcb origin, and in last, calibrate the pcb, teach the machine to where to pick from and where to place. and then again calibrate pcb before run the machine each time for new (same design)pcb.

use 3 point calibration for much better accuracy. use letest version of chmt software..

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[Ray Jones]

@Hank - AHHH - that could explain why some tantalums always are getting placed cocked. Perhaps using a larger nozzle is a good idea for bulkier (more inertia) albeit small parts.

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[Nicolas Krause]

HI All, Thank you for the tips, calibrating the camera position made the machine much more accurate, I'm going to try a test run on a full board now!

[Nicolas Krause]

So the calibration suggested by Ashwin was very helpful, there was definitely a calibration issue with the cameras and nozzles. Now when placing my first test component (R9) I have a much improved position. However I'm still off by about the width of a resistor. Are there any other calibration settings to check?

[Ashwin Abhang]

good to hear from you that my suggestion was helpful to you. Actually i had the same issue with my machine.. so i did some calibration and it worked fine for me.. currently i also getting +0.5 mm offset in Y axis for placing 1206 components.. so i am using a trick here that before starting full board run, i calibrate each pcb using 3 point calibration. and while selecting position for all 3 points, i use -0.5mm offset in Y axis. so after full run, software adds that offset cordinate to original set location and resulting in 0mm offset placement.. i will work to solve that issue also but may be this trik will be helpful for you..

also i am thinking to move to OPENPNP for CHMT36VA..as original charmhigh software dont give us full machine control..

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[Nicolas Krause]

Thanks Ashwin, that last tip appears to have resolved the component placement, going to work on a whole board now!

[Ashwin Abhang]

welcome 😊...

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[Cesar Cruz]

Hello friends
Can someone tell me what the secret number?, I want to modify the parameters of the machine.

Kind regards

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Greetings!!!

 

César Cruz.

 

Please consider the environment before printing this e-mail

[Ashwin Abhang]

Go through the manual.. it has all the codes there.. or try 20090318 

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[Jerry Zdenek]

My notes from previous messages on the list about the passwords are:

To access the secret setup menu use these numbers instead of the 123456 password:
20090318
74867430

The first one give you access to a bunch of calibration screens, including one for vision.
The second one is a simple slider to help you figure out what threshold you want to use.

Jerry

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[John]

Try single stepping through the program and look to see if the up looking camera is properly identifying the part's center and orientation. There is a YouTube video from Charmhigh that shows how to adjust the video parameters for the part so that is selects the actual part in the visual field, not something else. That helped me and helped with slightly rotated parts. Also, I put a black piece of paper on the green flange on the Juki nozzle, it made it easier for the camera to pick up only the part.