Wow Steve,
too much coffee or what? Maybe it's the "Gregory" thing, I get the same way. Hardeeharhar.
Jason Gregory
Software Specialist - NPI Group
SCI Systems/Plant 2
13000 S. Memorial Pkwy.
Huntsville, AL. 35803
(256) 882-4107 x3728
[log in to unmask]
>>> [log in to unmask] 07/05/01 07:18PM >>>
Okay, I know I'm going to piss some people off...I'll test components from
AVX, Murata Erie, Kemet, Vishay, Texas Instruments, Amkor, Signetics,
National Semiconductor, Fairchild, Motorola, etc...etc...and then I'll find
that everything is okay... DO YOU THINK THIS IS NECESSARY? BE REAL!!!!
Don't you think that solderability is foremost in the vendors of these
components? Do you ACTUALLY think that we have to double-check what they say
they are going to provide to us? That we have to check everything they
provide to us?
I'd like to hear from component manufacturers...do we need to check your
stuff? If we do, I would be ashamed....
-Steve Gregory-
> J-STD-001C 5.2 Solderablity: Electronic/mechanical components and wires to
> be soldered shall meet the requirements of J-STD-002 or equivalent . . . I
> do not see a requirement for 100% solderability testing. I am not a
> proponent of 100% solderability testing.
>
> I submit that the standard requires you to "know" that the part you intend
> to use in production be solderable as defined in J-STD-002. I believe you
> can "know" this through statistical methods and sampling.
>
> I set up a sampling plan for our board suppliers that specified sampling by
> date code. So, in the case where our supplier manufactured many different
> part numbers our testing requirements were reduced. We found the system to
> be effective (identified defective product and minimized inspection and
> test), and our customers approved the system.
>
> I think the part of the standard that might be getting you is 5.4
> Soderability Maintenance: . . . ensure that all componets, parts, leads,
> wiring . . . are solderable.
>
> But, I interpert this paragraph as addressing storage and handling. It does
> not mention testing or inspection. This paragrah requires the manufacturer
> to "know" that storage and handling has not degraded the components to be
> soldered.
>
> The end item acceptability criteria in the J-STD-001 and IPC-A-610 assume
> that the materials and methods used conform to the requirements of the
> standard. This is not a version of process control it is a prerequisite for
> compliance.
>
> A means by which we can provide assurance is SPC, rather than 100%
> inspection. One of the four essential techniques in Statistical Quality
> Control (from the Western Electric Handbook, 1956 based on Shewhart's work)
> is Statistical Sampling Inspection.
>
> Guy Ramsey
> Senior Lab Technician / Instructor
>
>
> E-Mail: [log in to unmask] <mailto:[log in to unmask]>
> Ph: (610) 362-1200 x107
> Fax: (610) 362-1290
>
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