Frank N Kimmey CID+
Sr. PCB Designer
Powerwave
Technologies
EDH 916-941-3159
FAX 916-941-3195
--------------------------------------------------------Original Message-----
From: Barry Gallegos [mailto:[log in to unmask]]
Sent: Thursday, June 05, 2003 7:45 AM
To: [log in to unmask]
Subject: [TN] IPC PCB Dimensioning standard---------------------------------------------------Good Morning TechNet.
I have sent the following Message to the Designers Counsel forum. And thought I would send here as well.
We have an issue on a customer drawing, where the customer calls out dimensioning on their data, to 3 decimal places, but do not provide a tolerance table or tolerance indication at all. The exact method the customer used to call-out dimensions on their drawing is: 250Mils or 530Mils for example. The pcb shop that built these is saying that, in the absence of having a tolerance call-out, they default to IPC standard tolerance. The customer service person at the pcb shop, cannot tell me which standard he is referring to, nor can he tell me what that default IPC standard tolerance might be. We do not have the 2221 IPC design standard nor do I know if it would cover this issue. We have issue with the dimensions of these pcbs we received, including hole positions.
Can you find out what the IPC default tolerance is for dimensioning of pcbs, in the absence of having a specific tolerance call-out?
Barry
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