TECHNET Archives

April 2005

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Mike Fenner <[log in to unmask]>
Reply To:
Date:
Wed, 27 Apr 2005 09:43:24 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (69 lines)
I've been out of this a while but so far as I recall
Assuming a CO2 laser and FR4, theoretically if it is correctly tuned/focused
it should give a big enough instant enough whack that the laminate is
vaporised before it burns. In practice you are likely to get a little
discoloration (no charring), you can reduce this by going for a perforation
rather than a continuous cut as this reduces rate of heat input leading to
local overheating.
If you are looking at the high frequency funny stuff laminates with random
weaves, then it is possible to make continuous cuts on some of these OK,
[but there are too many types to remember now which specifically].


Regards

Mike Fenner
Indium Corporation

T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com






-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Atkinson, Neil
Sent: Tuesday, April 26, 2005 6:10 PM
To: [log in to unmask]
Subject: [TN] Laser Cut PCBs


We are looking to use lasers to de-panel assembled PCBs, the initial results
look very good apart from a slight burning (obviously) on the edge of the
laminate.  The burn is just on the surface in most cases but can discolour
the laminate up to ¼ mm into the PCB in the worst case.

Does anyone have experience of this?  What reliability issues can you
foresee?

By the way - Petrol (Gas) is currently almost $7 a gallon in the UK!

Many thanks,

Neil


:::::::::::::::::::::::::::

This email, its content and any files transmitted with it are intended solely for the addressee(s) and may be legally privileged and/or confidential. If you are not the intended recipient please delete and contact the sender by return and delete the material from any computer. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited.

Messages sent via this medium may be subject to delays, non-delivery and unauthorized alteration. This email has been prepared using information believed by the author to be reliable and accurate, but Indium Corporation makes no warranty as to accuracy or completeness. In particular, Indium Corporation does not accept responsibility for changes made to this email after it was sent. Any opinions or recommendations expressed herein are solely those of the author. They may be subject to change without notice.

:::::::::::::::::::::::::::

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2