just curious, what means of separating the finished panels do you use?
tabs with little mouse bit holes? 
.1" route slots between?
how do you clean up the rough parts?

Dennis Saputelli


Brad Velander wrote:
> 
> Dennis,
>         the main benefit is for SMD designs with components on both sides.
> If the panel is laid out correctly (i.e. symmetrically as flipped), the
> assembly process can use one set-up and run the boards through the one line
> twice. During the first pass board A has it's top side components placed at
> the same time as board B has it's bottom side components placed. At the end
> of the line after reflow, the board is flipped and sent back through the
> same line. During this pass board A has it's bottom side components placed
> and Board B has it's top side components placed. One set-up, one line, one
> program, two reflow cycles. This is very significant to assembly costs
> because so much time is spent (read wasted) setting up lines and tying up
> lines for a production run. In an example like this, they tie up only one
> line, program it only once, load the parts once, but reflow twice. Got the
> idea?
> 
>         There is a second benefit to this panelization as well, it comes
> into play with high frequency RF designs (solid plane bottom side, all
> circuits top side) like we do where absolute finest control of feature
> dimensions are required (i.e. IPC class 3 at +/-20% is a mile off to us).
> During fabrication, plating and etching can be grossly unequal from one side
> of the board to the other due to density of plating or copper to be etched
> away. Flipping each alternate board evens the distribution of copper thus
> equalizing the plating and etching characteristics of the board over the
> whole panel allowing for finer fabrication tolerances.
> 
> Sincerely,
> Brad Velander.
> 
> Lead PCB Designer
> Norsat International Inc.
> Microwave Products
> Tel   (604) 292-9089 (direct line)
> Fax  (604) 292-9010
> email: [EMAIL PROTECTED]
> http://www.norsat.com
> 

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