Do you have two side fillets instead? or only bottom IMC?
Reuven

On Wed, Aug 24, 2011 at 11:57 PM, Phil Bavaro <[log in to unmask]>wrote:

> Hypothetical situation:
>
> Gull wing lead, land pattern error, zero heel (also zero toe) fillet.
> Hardware would not meet Class 3 workmanship requirements.
>
> An equation is being used to decide if the pad to gull wing lead lap
> solder joint is adequate to survive the intended thermal cycling
> environment.
>
> This would have been a question for Werner but I am sure there are
> others here who can shed some light on this for me.
>
> I know that part of the justification for why we have set our IPC
> standards where they are is partly based on years of testing.
>
> How could a mathematical calculation such as "Steinberg equation"
> justify a lack of Class 3 gull wing lead heel fillet?
>
> Any help is appreciated.
>
>
>
>
>
>
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Best Regards,

*Reuven Rokah*

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