interesting....

I have IPC-2222 dated February 1998.
Table 4-10 is not listed in the "figures" section
of the Table of Contents (the last Table in that
chapter is 4-6)
and
the first sentence of 4.3.7.5 says "see table
below" but there is no table.

Was there an amendment to IPC-2222?

onward thru the fog,
Jack



On 4/29/08, [log in to unmask] <[log in to unmask]> wrote:
>
> My hardcopy of IPC-2222 dated February 1998 does have a Table 4-10.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Tuesday, April 29, 2008 12:39 PM
> To: [log in to unmask]
> Subject: Re: [TN] TechNet Digest - 26 Apr 2008 to 28 Apr 2008 (#2008-114)
>
> Phil,
>
> I just found it.
> Look in section 4.3.7.5 of IPC-2222
>
> It is expanded to Table 4-10 of IPC-2222A working draft
> and it is amazingly more complicated than my "10%" answer!!!!
>
> (I don't know if Revision A is published yet. If it is, refer to THAT)
>
>
> *
>
> Table 4-10 Printed Board Thickness Tolerance Levels *
> *
>
> Board Thickness (mm) [in] *
> *
>
> Tolerances by Level *
> *
>
> Level *
> *
>
> A *
> *
>
> B *
> *
>
> C *
> *
>
> As applied Base to Base *
>
>   ≤ 1.6 [0.062]
>
> + 15 %
>
> + 12 %
>
> + 10 %
>
> > 1.6 to ≤ 2.3 [0.062 to 0.090]
>
> + 12 %
>
> + 10 %
>
> + 7 %
>
> > 2.3 to ≤ 3.8 [0.090 to 0.149]
>
> + 10%
>
> + 7 %
>
> + 5 %
>
> > 3.8 to ≤ 6.4 [0.149 to 0.251]
>
> + 10%
>
> + 7 %
>
> + 5 %
> *
>
> As applied over Final Finishes and Coatings *
>
> ≤ 1.6 [0.062]
>
> + 20 %
>
> + 15 %
>
> + 12 %
>
> > 1.6 to ≤ 2.3 [0.062 to 0.090]
>
> + 15 %
>
> + 12 %
>
> + 10 %
>
> > 2.3 to ≤ 3.8 [0.090 to 0.149]
>
> + 12 %
>
> + 10 %
>
> + 6 %
>
> > 3.8 to ≤ 6.4 [0.149 to 0.251]
>
> + 12 %
>
> + 10 %
>
> + 6 %
>
> 1.6 = 0.062
>
> 2.3 = 0.090
>
> 3.8 = 0.149
>
> 6.4 = 0.251
>
>
> On 4/29/08, Jack Olson <[log in to unmask]> wrote:
> >
> > Phil,
> >
> > I can only give you a partial answer (because I can't find it in any IPC
> > docs either!)
> > The way you are specifying it is fine, except you must allow
> > +/-10% tolerance
> > (I know it is 10%, but I searched every relevant doc I have for "10%",
> > can't find it)
> >
> > The reason it is most often measured to include the plated metal,
> > is because in the past it most often mattered for edge connectors.
> > The edge connector had to include the distance from the gold finish
> > on one side to the gold finish on the other
> >
> > Jack
> >
> > p.s. Final thickness is never measured to include the mask.
> > p.s.s. I can post your question over on the IPC Designer's Council if
> you
> > want me to?
> >
> >
> > >
> > > Phil Nutting <[log in to unmask]>
> > > Sent by: TechNet <[log in to unmask]>
> > > 25.04.2008 21:52
> > > Please respond to
> > > TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> > > Phil Nutting <[log in to unmask]>
> > >
> > >
> > > To
> > > [log in to unmask]
> > > cc
> > >
> > > Subject
> > > [TN] Specifying board thickness
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi Technetters,
> > >
> > > We are reviewing how we specify finished circuit board thickness to
> make
> > > sure we get what we think we specified.  Recent events have placed
> what
> > > we
> > > specify under scrutiny.  I've looked through IPC-2221, IPC-2222, IPC-
> > > 4101B, IPC-6012B and IPC-7351A with no luck.
> > >
> > > Currently our documentation calls for 0.059" finished board thickness
> > > without measuring the thickness of the copper.  Presumably when the
> > > copper
> > > is added we get to 0.062" finished thickness which is important when
> we
> > > start stacking circuit boards on standoffs.
> > >
> > > How do others specify circuit board thickness?
> > >
> > > Is there an IPC spec I can quote chapter and verse?
> > >
> > > Thanks in advance.
> > >
> > > Phil Nutting
> > > Design for Manufacturing Engineer
> > > Kaiser Systems, Inc.
> > > 126 Sohier Road
> > > Beverly, MA 01915
> > > voice: 978-922-9300 x1310
> > > fax: 978-922-8374
> > > e-mail: [log in to unmask]
> > > www.kaisersystems.com
> > >
> > >
>