Chris,

I understand what you're asking, but it seems to me that
you're allowing the spec *in this specific case* to rule
tolerance.  In other words, if a vendor had a machine
that had a tolerance of 0.9 either way, I don't think
I'd do business with them.  That's the business end
of it.

It's a matter of call here.  ***IF*** a 0.9 deviation either
way is *acceptable to you*, then my guess is that you could
get away with that specification.

Just my 2.3 cents.

At 04:57 PM 10/13/98 -0400, Chris Ball wrote:
>Ok then, can anyone enlighten me slowly? Lemme rephrase it a bit....
>
>1206 resistor pads are 1.8 wide. The body is 1.8 max wide. IPC-A-610B,
>class 2 says it's acceptable as long as you have 50% overlap of widths...
>so it can move .9 either side... so that's a box 3.6 wide that is ok...
>right so far? So if two 1206 resistors are side by side, 3.6 apart, and
>each part is shifted worst case, they touch. Is that an acceptable
>condition per IPC-A-610B, class 2? Or does it mean the parts have to be
>spaced further than 3.6 in order to insure that your board is
>manufacturable per IPC-A-610B, class 2? Or does anything mean anything
>anymore? C'mon y'all....Jo-Ann?... Gary?... Abdulrahman?...
>
>Thank you in advance for all your help ;-)
>-Chris-

################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe:   SIGNOFF DesignerCouncil 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################