 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0wS2CY-000BjBC; Thu, 15 May 97 10:12 CDT |
| >From bergdi Thu May 15 10: |
13:04 1997 |
| Old-Return-Path: |
|
| Date: |
Thu, 15 May 97 08:23:09 PST |
| Precedence: |
list |
| Resent-From: |
|
| Resent-Sender: |
|
| X-Status: |
|
| Status: |
O |
| X-Mailing-List: |
|
| TO: |
|
| Return-Path: |
<TechNet-request> |
| From [log in to unmask] Mon May 19 09: |
41:34 1997 |
| Subject: |
|
| From: |
|
| X-Loop: |
|
| Resent-Message-ID: |
<"FKU5b3.0.8yC.3VoUp"@ipc> |
| Message-Id: |
|
| Parts/Attachments: |
|
|
Robert,
What are the issues with the assembly process?
______________________________ Reply Separator _________________________________
Subject: Problems with Via in Pads
Author: [log in to unmask] at corp
Date: 5/15/97 10:00 AM
Hi TechNetters,
We are experiencing assembly problems with 13.5 mil drilled vias in pad
from one of our board suppliers. After looking at cross sections from a
sample during the problem period, I suspect that the root cause of the
problem is irregular hole walls due to drilling. My questions are regarding
the drill operation.
How many boards are acceptable in a stack up at drill assuming .062"
multilayer and .0135" drills?
With the proper stack up, how many hits are acceptable for a new and/or
a resharpened drill?
How many times can a .0135" drill be reliably resharpened?
Any other thoughts as to the cause of rough hole walls on via holes would be
appreciated.
Thanks,
Robert Furrow at Lucent Technologies, North Andover, Ma.
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
* with <subject: subscribe/unsubscribe> and no text in the body. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
* with <subject: subscribe/unsubscribe> and no text in the body. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|
