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Semi-Auto Stencil Printer Vision Systems; Homebrew

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Tom

#75096

Semi-Auto Stencil Printer Vision Systems; Homebrew | 19 December, 2015


Tom

#75097

Semi-Auto Stencil Printer Vision Systems; Homebrew | 19 December, 2015

#75101

Semi-Auto Stencil Printer Vision Systems; Homebrew | 19 December, 2015

Do you just wish to use the setup as a visual aid to alignment. In which case this is not a bad idea. the only issue you will find yourself finding, is he field of view you will need to get your alignment. I have done this sort of thing with a hybrid printer where we needed 20 layers aligned. Over 20 print cycles, but the field of view was 3 x 4 inches. And the camera was about 2 feet above the board. No doubt your setup will be different!

regards sarason

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Tom

#75103

Semi-Auto Stencil Printer Vision Systems; Homebrew | 19 December, 2015

#75104

Semi-Auto Stencil Printer Vision Systems; Homebrew | 20 December, 2015

Generally, that should not be a problem. Software for this purpose is pretty simple, the main issue is how accurately pcb carrier will be positioned at both ends. This is purely dependent on printer's mechanics. I have an old DEK247 and thought about doing the same, but it has issue when board pulls out of the print area - carrier does not stop at exactly the same position each time...

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Tom

#75105

Semi-Auto Stencil Printer Vision Systems; Homebrew | 20 December, 2015

Hi Deni,

Thanks for the input. That is my concern as well. Before getting to far I will try some repeatability runs and see if it is feasible.

What is your experience with semi-auto printers and the primary issues you contend with? I'd like to step up to a used auto printer at some point but we're still getting our feet wet with smt and semi-auto seems like a better place for us to start.

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#75106

Semi-Auto Stencil Printer Vision Systems; Homebrew | 20 December, 2015

We have DEK248 and Ultraprint100 printers. Ultraprint100 has custom video hardware while DEK has PC-based vision,which I prefer. Both perform roughly the same, and each has some design advantages over the other. We do routinely print 0.5mm pitch TQFP's , 0402's and some BGA's without problems (at least with print accuracy), so...

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#75115

Semi-Auto Stencil Printer Vision Systems; Homebrew | 21 December, 2015

The vision on our semi-automatic printers allows the operator to draw a box around a pad for reference. Then as long as both reference pads are lined up on consecutive boards, it's aligned.

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Tom

#75117

Semi-Auto Stencil Printer Vision Systems; Homebrew | 21 December, 2015

Great idea! That could be easier to write a program and also easier to see for the operator. Thanks for the information!

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