 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0tf6Bb-0000PBC; Wed, 24 Jan 96 08:28 CST |
| X-Incognito-Sn: |
106 |
| Old-Return-Path: |
|
| Date: |
Wed, 24 Jan 96 9:20:12 EST |
| Precedence: |
list |
| Resent-From: |
|
| From [log in to unmask] Tue Jan 30 10: |
19:13 1996 |
| Resent-Sender: |
|
| X-Status: |
|
| Status: |
O |
| X-Mailing-List: |
|
| TO: |
|
| Return-Path: |
|
| Resent-Message-ID: |
<"MjAio2.0.8gE.D8a1n"@ipc> |
| X-Incognito-Format: |
VERSION=2.02.90 ENCRYPTED=NO |
| X-Priority: |
3 (Normal) |
| X-Loop: |
|
| From: |
|
| Subject: |
|
| Message-Id: |
|
| Parts/Attachments: |
|
|
I am looking for information regarding the way various designers specify
copper thickness for boards, and how this information is translated by the
manufacturers. IPC-D-325A and IPC-D-275 are not clear on how this information
is to be stated or translated.
We have always indicated the copper weight as the starting weight, ie. 2oz,
1oz, 1/2oz, etc.. Some manufacturers translate this designation as finished
weight. They will start with a lighter copper and plate up to a finished
dimension, (start with 1oz, plate up to 2oz).
Tolerances are not stated in the IPC documents. IPC-RB-276 indicates that, in
the case of 2oz copper, the finished surface thickness should be .003".
What is the general direction of the industry? As indicated above, I have had
manufacturers indicate both ways.
Rich Ackerson
Sr. Industrial Engineer
Elsag Bailey Electronics
Voice 216-585-7646
Fax 216-585-8867
[log in to unmask]
or
[log in to unmask]
|
|
|
