I talked to my board house about this.

I believe the source of confusion is one of spec terminology.

In figure 3-13 the words " Minimum Wrap " are used to describe
the copper coming back away from the barrel wall.  Shown as 25um.

For lack of a better term I used the word "overhang ".

In table 3-2, the same words " Minimum Wrap " are used to describe the
thickness of the wrap. Shown in Figure 3-13 as "Minimum Copper Thickness"

An improvement to table 3-2 would be to use the same words in both places.

For example Table 3-2 "Minimum Wrap " could be changed to read
"Minimum Wrap Copper Thickness".

Thanks
Dave

Franklin Asbell wrote:

>Look again at Table 3.2, under code C.
>
>Under section C where it says Minimum Wrap (right below Copper - minimum
>average, and Minimum thinc areas). For class 3 the minimum wrap would be
>.472 mils thickness extending from the hole edge outward .984 mils.
>
>Not sure where you are getting overhang from?
>
>Franklin
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Seymour
>Sent: Thursday, January 24, 2008 3:28 PM
>To: [log in to unmask]
>Subject: [TN] ipc-6012B amendement
>
>Howdy,
>
>Section 3.6.2.11.1 of the 6012 amendment Dec 2006 talks about
>the Minimum Wrap on a via filled hole.
>
>In Diagram 3-13 there is a measurement labeled "Minimum Copper Thickness",
>which is shown as the thickness of the Wrap.
>
>Where is the table that shows the "Minimum Copper Thickness" by Class?
>
>Table 3-2 only talks about the amount of the overhang of the wrap, not the
>thickness as such. Table 3-2 has something called Min Thin areas, but this
>is not labeled in the diagram 3-13.
>
>Am I missing something?
>
>Thanks
>Dave
>
>
>
>  
>

-- 
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560

Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297

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