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Pattern matching type fiducial at Topaz/ Emerald machines

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Stefan

#48564

Pattern matching type fiducial at Topaz/ Emerald machines | 22 March, 2007

Does anyone know how to use the Pattern matching option for fiducials at Philips Topaz or Emerald SMT machines? Is it worth using it? Can it be used for example when you deal with hard to recognize fiducials like those on pre tinned PCB's?

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coop

#48578

Pattern matching type fiducial at Topaz/ Emerald machines | 22 March, 2007

Have you tried changing the algorithym type in mark info. to special 1 or 2 ? you will have to perform an F6 on this after you change it. If you were on Normal before then you will want to lower the threshold from the what you have it set at ,probably 115-155, lower it to 15-35 otherwise when you try to run a parameter search it will fail. I have used many different fiducial settings on these machines and always had more luck with using Normal algorithym type and changing lighting levels around, mixed with raising the tolerance, a little, and using the bottom two options in F6 mode of mark info, increasing these will enlarge the pixels and bleed out alot of crap. If none of this works then post what kind of fid. you are trying to use, size , color of area surrounding fid. and are these Gold?

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#48612

Pattern matching type fiducial at Topaz/ Emerald machines | 24 March, 2007

Hi, Thanks for the reply, The fiducial which posed problems is a 1 mm diameter gold plated circle fiducial. The problem with this is that the vision system sees it darker than the surrounding area. The surrounding area is all copper covered with the green protective lacquer. So when I select the Surface Type Reflect, it can't recognize it. If I put it on NonReflect It will sometimes recognize it and sometimes not. For these I use now the Special 2 algorythm and it works fine, with no recognition errors. And when I make the vision test in the Adjust Assistant, the white cross stays in the middle all the time, pretty stable. Do you think that it could recognize it badly sometimes without giving an error message? Because at some boards I had some missaligned components, though these could be like that for some other reason. What I really want to know is that the pattern matching can be used for reading for example hexagonal shaped fiducials with a hole in the middle? Because some of our projects have PCB's without dedicated fiducials and we have to resort to the recognition of a drill hole on some pad which is not round, nor square shaped but hexagonal.and this method can give missaligned placement, because the drilling is not made so precisely in the middle. Regards

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coop

#48646

Pattern matching type fiducial at Topaz/ Emerald machines | 26 March, 2007

as long as you are not getting recognition errors, and placements look good, go with it. as far as the pattern matching, the only thing I can think of is changing the it from circle or square to sp. shape and giving it the dimension sizes asked for. I have mainly used this on the two squares connected by a corner, style fids. I will play around with my machine and let you know anything else I may find that works.

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coop

#48647

Pattern matching type fiducial at Topaz/ Emerald machines | 26 March, 2007

as long as you are not getting recognition errors, and placements look good, go with it. as far as the pattern matching, the only thing I can think of is changing the it from circle or square to sp. shape and giving it the dimension sizes asked for. I have mainly used this on the two squares connected by a corner, style fids. I will play around with my machine and let you know anything else I may find that works.

reply »

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