Right,
They indicate the level of difficulty or complexity or . . . There has been
some wordsmithing over the years.
A, B and C right? A is pretty easy for most shops. C is difficult. In
practice many shops are working beyond C now but. It is worth reading the
forward in IPC 2221 which holds the keys to proper use of the standard.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Thursday, October 30, 2008 11:41 AM
To: [log in to unmask]
Subject: Re: [TN] IPC 2222 classes
Mark, et al, Sorry for a blunder on my part. IPC-2222 uses the term 'Level
A', etc, rather than Class. I was just back over in the inspection area and
noticed my mistake. Classes seem to be connected to tolerance on mechanical
dimensions. Louis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark)
Sent: Thursday, October 30, 2008 11:13 AM
To: [log in to unmask]
Subject: Re: [TN] IPC 2222 classes
Louis,
I haven't looked at IPC-2222 but in IPC-600 and IPC-610 the definition of
classes is located in the beginning of the spec, in the introduction.
Briefly:
Class 1: General consumer electronics. Cosmetic imperfections
are allowable, and functionality after assembly is most important item on
list.
Class2: Communications equipment, business equipment. High performance and
reliability are desired, but no one dies if the equipment quits.
Class 3: High Reliability, life support, flight systems,
reliability is critical.
Hope this helps.
mark
Mark Woolley
PTRL Laboratory
Avaya, 1300 West 120th Ave, Area 33, Westminster, CO, 80234
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Thursday, October 30, 2008 7:50 AM
To: [log in to unmask]
Subject: [TN] IPC 2222 classes
TechNetters, looking at IPC-2222, I see references to Class A, Class B, and
Class C. I can't find a definition of the 3 classes in the document.
Would someone comment on how these classes are assigned or determined?
The question arose in the context of looking at a drawing with no
dimensional tolerances. I'm asking for tolerances from the customer, but
want to do my own homework on the issue. Thanks. Louis
Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1272
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