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November 2005

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Subject:
Re: Leadfree: PPM v/s % in Z-Axis Expansion
From:
MA/NY DDave <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Tue, 15 Nov 2005 12:22:47 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (20 lines) 
Hi Ken, IPC LF Listservers,

In addition to Werner's note please remember that normally Z-Axis is
normally significantly different than the X-Y plane and will be different
depending on where you measure it. A large plated hole versus a non copper
E/G area is one small example for a logic type card.

FEA supported by experiments is about the only way.

Yours in Engineering, Dave
YiEngr, MA/NY DDave

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