Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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fiducial cleaners

pzohbon

#6501

fiducial cleaners | 7 May, 2001

Does anyone know of a good manfacturer or supplier of fiducial cleaner pens. We are seeing a haze left behind on our current cleaners.

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Kemosabe

#6507

fiducial cleaners | 8 May, 2001

I've never heard of such thing!!! We do occasionally have problems with fiducial recognition and have a difficult time convincing our operators not to use pencil erasers on them. The erasers take care of the recognition problems, but leave shavings that could end up in all sorts of inappropriate areas.

What are you using now? Who makes them?

Thanks,

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CAL

#6509

fiducial cleaners | 8 May, 2001

Hmmmmm........I am thinking!!!!! Cleaning is the final process in our situation. After cleaning we have no need for the fiducials. Is the haze causing fiducial recognition problems? Ideally what you are looking for is a contrast between fiducial and the FR4. A hazy fiducial should still be recognized by the camera system. Abrasive cleaner (such as pencil erasers and burnishing brushes) will leave behind unwanted contaminates. A flux pen will undo the whole cleaning you just completed. What type of solder paste are you using?

Caldon W. Driscoll ACI USA 610-362-1200 cdriscoll@aciusa.org

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K

#6512

fiducial cleaners | 8 May, 2001

I've seen these used & they work quite well. The fiberglass scratch brush.

http://contacteast.com/product/prodpage.cfm?grp=4F7A9B48-C870-11D4-8A700050DA5FEB55&sid=FC52FB8C-A662-46E4-B3CBDAD625F7B085

You will want to train the operators to use some caution though, as excessive force will remove more than you want.

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CAL

#6513

fiducial cleaners | 8 May, 2001

McMaster-Carr Company http://www.mcmaster.com Pocket Contact file and burnisher

Caldon W. Driscoll ACI USA 610-362-1200 cdriscoll@aciusa.org

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#6529

fiducial cleaners | 9 May, 2001

Sounds like a good excuse to jump into straightening-out your "not-cleaning" process, eh?

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pzohbon

#6538

fiducial cleaners | 9 May, 2001

What are some cleaning options? Or is it a camera issue? Not all our boards need the fiducials cleaned so it is hard to tell.

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#6539

fiducial cleaners | 9 May, 2001

Beats me. I thought you said "We are seeing a haze left behind on our current cleaners."

I don't even know why you need to clean fids. [Are you scrubbing each fid to make it bright and shiney? What's on them? Why are you doing this?][I'm sorry I'm so dumb, but I just am not connecting.]

1 If we get a lot of boards with doinked fids, we learn the fid on the machine as doinked or learn something else on the board as a fid for that lot of boards. In the mean time, we pimp slap [you could use the "super market pinch", if pimp slapping is not your thing] our fab supplier and tell him to quit messing with the darn fids. Case closed. [Well, at least 'til the next time a supplier goes in brain lock.]

2 If our aqueous cleaner leaves a residue on the fids, it's more than likely smeared across everything else on the board. We then resolve whatever is messed-up with the cleaner.

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#6541

fiducial cleaners | 10 May, 2001

I think the main purpose of cleaning a fiducial is not to make them nice and shine, but to get a haze on them. In particular dome shaped fiducials create too much reflection from the light source and distort the image. The eraser pencil is a bandage, but a polarization filter would fix the root cause, or use a different fiducial as Dave recommended. Source for the filter: http://www.edmundoptics.com

Stefan

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