Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0v1Smz-0000PYC; Fri, 13 Sep 96 02:35 CDT |
Content-Type: |
text/plain; charset=US-ASCII |
Old-Return-Path: |
|
Date: |
Fri, 13 Sep 1996 03:43:51 EDT |
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: |
<"KEUhj2.0.nqB.KxGEo"@ipc> |
Subject: |
|
From: |
|
X-Loop: |
|
From [log in to unmask] Fri Sep 13 10: |
36:23 1996 |
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: 13 September 1996
SUBJECT: COMPENSATION MACHINE
Re - compensation machine
X-ray optimisers, as they are known, are available from a number of
companies:
Multiline (OPL)
Pluritec
etc.
Some of them work by looking at a target on all layers at the same
time, then making a best fit, compensating to centralise the datum,
and then drilling or punching tooling holes on a fixed pitch,
whilst others look at targets on each individual layer, and
compensate to get best fit.
The advantage of the latter system is the feedback it gives
on a layer by layer basis of the material shift, in order that
compensations can be made to improve NEXT time round. The former
system also feeds back information on shift, but is limited to the
best fit data.
Dougal Stewart
Product development manager
Exacta Circuits
Scotland
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
|
|
|