Steffen,

What works best for us is a .060" circle.  We had problems with our Screen Printer when
it first arrived I believe because the unit used "white" light.  After the vision
system was changed to "red" leds 90% of our problems went away.  What also helped was
going from HASL to Omikron a much flatter surface.

Chris

"Steffen, Don E" wrote:

> Technetters
>
> What is the best shape of fudicials relative to size and configuration? Also
> if the board has HASL on all of the pads, can the fudicials be of different
> material other than HASL? We are having a problem with reflective light
> causing a lot of rejected boards. This is also causing down time. What is
> the industry using for this technolgy. We have DEK 265 printers and Philips
> and Siemens placement machines.
>
> Donn E Steffen
> Senior Quality Engineer
> VDO Control Systems
> Auburn, IN 46706
> Phone (219)925-8887
> Fax (219)925-8710
> Email: [log in to unmask]
>
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