 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0w8mP1-000BBjC; Sun, 23 Mar 97 06:29 CST |
| Content-Type: |
text/plain; charset=US-ASCII |
| From [log in to unmask] Mon Mar 24 06: |
12:11 1997 |
| Date: |
Sun, 23 Mar 1997 07:39:09 EST |
| Precedence: |
list |
| Resent-From: |
|
| Resent-Sender: |
|
| MIME-Version: |
1.0 |
| Status: |
O |
| X-Mailing-List: |
|
| TO: |
|
| Return-Path: |
<TechNet-request> |
| X-Status: |
|
| Resent-Message-ID: |
<"ezVKs2.0.fAP.k8IDp"@ipc> |
| Subject: |
|
| From: |
|
| X-Loop: |
|
| Old-Return-Path: |
|
| Content-Transfer-Encoding: |
7bit |
| Message-Id: |
|
| Parts/Attachments: |
|
|
\0
TO: I4235700 IBMMAIL new address for ipc technet 25.6.96
FROM: DSTEWART EX2 D.Stewart - Product Development Manager.
DATE: 23 March 1997
SUBJECT: EXCESSIVE CAKING OF DEBRIS (DRILL)
A couple of issues to look at -
1. what is the material you are drilling? as Tg goes higher,
infeeds have to drop. We used to have issues like this with
drilling BT epoxy, and I have heard of others have issues with
multifunctional FR4 (Tg170).
2. is the laminate fully cured?
3. is your pressure foot insert too large? Many machine suppliers
are now supplying smaller diameter inserts to allow good pressure
onto the panel, and good extraction. The optimum insert diameter is
7-8 mm.
4. is your backing material sufficiently hard to break up chips,
and are you drilling too deep into your backing?
hope this helps
Dougal Stewart
Exacta Circuits
Scotland
The views etc.......
***************************************************************************
* 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] *
***************************************************************************
|
|
|
