My board design is in English units, primarily, but I have several small
outline parts for which the footprint is in Metric units and the pad pitch
is variable and results in off grid pad centers with respect to the English
grid. My rules are 5/5 mil and the part is a 402 class 4 part resistor
pack, small enough that the differences in English and Metric pitch worries
me. My question is: what is the proper convention for interfacing this part
into an English unit layout? Does it matter? For example, if I define the
part layout in metric the system accommodates by allowing me to connect
tracks to the metric center of the pads, which is fine. But do the odd
angles that result create any problems for the Gerber photoplotter creating
the tracks in tight quarters? Should tracks be laid to the nearest English
pitch inside the pad for example? Any offer of the right way to do this, if
it matters, is appreciated. I have noticed that the "quality" of the layout
begins to be degraded or becomes inconsistent as the layout is edited due to
the different units.
TIA
regards,
Tim Hutcheson
ICQ #32491889
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