I must side with the engineer in the requirement to document the
panelization of your PCB in the fabrication drawing. Your assembler
produces the automated pick and place program and the custom fixturing
to assemble your board based on the existing panelized configuration of
your PCB. That data provides fiducial locations, tooling hole locations
and locations of each individual PCB within the panel. This is
hunky-dunky as long as you do not change suppliers. The assembly
engineer's delimma begins when you change suppliers. What are the
chances that a new supplier shall happen upon the same configuration for
the panelization, tooling holes and fiducials of your present
supplier??? 100% if you document that data. Providing a sheet 2 of your
fab drawing to capture that data is good practice. Additionally, if you
do not document the panelization and the PCB is produced incorrectly by
your present supplier somewhere along the product life cycle, guess who
eats the cost?
>
>
>Hi All,
> I need your in-the-trenches opinions on panalization dwgs. An engineer at
>another plant of ours, wants us to include a panalization dwg with our pcb
>fab dwg to "reduce cost and provide complete design integrity against a
>vendor incorrectly scoring or putting perforating tabs in the wrong place". I
>think of this as methodising a process that I don't have to, but I may be
>wrong. It has also been suggested that we provide dimensions for HASL instead
>of using a min/max note, again I have never been bit by this problem, I
>believe that if you have a good team relationship with your suppliers you
>both make money, thanks.
>Ted Nathan
>PCB Designer
>Celwave, PHX
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