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Reply To: | TechNet Mail Forum. |
Date: | Tue, 25 Nov 1997 12:25:12 -0500 |
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Tenison
I had this experience long time ago in one of my previous companies and
I had been suffered a while. Fortunately, I figured out the problem came
from the pad pattern design which the pad spacing was too big and
caused uneven tensil when reflow if a little misalignment occured. After
narrowing down the spacing for the 0402 pad, this problem disappear!
I hope this work for your case!
Fulton Feng
Nortel
>----------
>From: Tenison Stone[SMTP:[log in to unmask]]
>Sent: Monday, November 24, 1997 11:40 AM
>To: [log in to unmask]
>Subject: [TN] tombstoning
>
>I have having trouble with tombstoning on a large flat with lots of 0402
>parts.
>
>I have investigated pad geometry, stencil aperture geometry, and
>recalibrated placement equipment.
>
>Can anyone help with this problem?
>
>Tenison Stone
>Telex Communications
>
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