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Stencil alignement using the 2 cameras

#24148

Stencil alignement using the 2 cameras | 15 April, 2003

hi, we used to place SMDs with adhesive and wave solder machines. Now we try to work with an old stencil printer that we have ane then reflow, and we have no experience.Can anyone tell us by which method stencils are aligned using the 2 cameras of the printer?

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#24149

Stencil alignement using the 2 cameras | 15 April, 2003

what is the manufacturer and model of the printer you are planning to use? actually, if its a semi-automatic machine you may not need the cameras to align the stencil to the board. you can "bomb-site" it.

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RDR

#24150

Stencil alignement using the 2 cameras | 15 April, 2003

here is how it is done.

1.Position the stencil in the machine.

2.Position the board onto the PCB tooling as close to being aligned with the stencil as you can.

3.Place mylar or some thin clear material over the board. your printer should have provision for this.

4.Print the board with the mylar on top.

5.Align the print to the board with your X,Y, and theta correction.

6.Remove mylar.

7.Teach current/corrected location of fiducials with cameras.

You are ready to go! You will be surprised as to the accuracy of this method if your printer is in good mechanical shape. We print 16mil pitch like this every day with barely any defects <50DPMO.

Russ

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