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
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-----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
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