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Date: | Thu, 26 Apr 2007 14:24:13 -0700 |
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At 12:23 PM 4/26/2007, Werner Engelmaier wrote:
>Hi All,
>Vias should never be specified in terms of finished hole size (there is no
>functional need for any specific finished hole diameter),
And yes I agree wholeheartedly that the drilled diameter is the most
critical dimension -- especially in the case of pressfit connectors where a
gas tight joint w/out over stressing the barrel/post is the goal.
However, in the case of pressfit connectors, I beg to differ about finished
hole diameter not being needed . Min hole size is very important in this
case. It determines the point at which insert forces get too high and bad
things start to happen (e.g. "Z-ing" in pins to board surface).
dw
> but in terms of
>drilled hile diameter, because that determines all kinds of things
>important to
>the reliability of the via interconnect structure.
>
>Werner
>
>
>
>**************************************
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