Yes Mark, I got a nice e-mail from J. Philip Altomare, Jr.,V.P.
Sales/Operations, AccuSystems Corporation (after opening my big mouth and
inserting both feet....) But hey, that's what learning is all about...
I didn't know there was a problem with the soldermask being clear of the
v-score lines. Does it tend to gum up the cutting process? Most of us are
building boards that are made of FR-4 but I have done many out of other
materials. I think we deal with the issues by talking with our favorite
board shop and asking questions... in fact that is how I found out about the
1/3, 1/3, 1/3 method.
The more you guys who deal with it on a daily basis get the info out to the
designers the more smooth the building process will become. Do you guys also
have a webpage that talks about v-scoring like AccuSystems?
- Bill Brooks
(with a large rule of thumb)
-----Original Message-----
From: Mark Simmons [mailto:[log in to unmask]]
Sent: Thursday, June 22, 2000 8:59 AM
To: [log in to unmask]
Subject: Re: [TN] V-score depth
Dennis, Steve, et al....
i suspect the reason this topic keeps coming up is because of our well
intended desire
to nail things down. after all, there are so many things to keep track of,
eh?
By way of review,...there are too many variables to be specific about what
the
remaining core thickness (web) should be. the chart that Steve recommended
from the
Accusystems web page, takes into consideration the most variables, but still
makes many
assumptions. i.e.; the material is FR4, and the score line is not adjacent
to SMT
component lands. So this chart will get you into the ball park, but you must
find your
own seat. Here at Vscore Central, we deal with these issues on a daily
basis...over
the years, we have seen some pretty strange stuff. There is an astonishing
lack of
convention. There are a number of mis-applications, including replacing
small holes
with score lines on tab rout designs. Simple things like providing solder
mask
clearances for the score lines are overlooked. (acrylic masks machine so
poorly..)
Generally, the process is an afterthought (at best) for most designers...but
i
digress. In summary, be careful with "rules of thumb".
Mark Simmons, V-Score Central, Inc.
"Beerman, Dennis" wrote:
> Unfortunately, the details in IPC-2222 do not give any dimensions, only
> tolerances. In the January 1999 IPC Designers Council Technical Journal
> there is an article concerning V-Grooving.
> For .062 FR-4 material they specify that the material remaining between
the
> grooves should be .016.
>
> ----------
> From: Joseph E. J. Duclos Jr. [SMTP:[log in to unmask]]
> Sent: Wednesday, June 21, 2000 11:02 PM
> To: [log in to unmask]
> Subject: Re: [TN] V-score depth
>
> Take a look at IPC-2222, the have a scoring detail and a page or
two
> worth
> of info.
>
> Joe Duclos...........
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Ryan Jennens
> Sent: Wednesday, June 21, 2000 11:07 AM
> To: [log in to unmask]
> Subject: [TN] V-score depth
>
> Hey everyone-
>
> I was following the v-score discussion on Technet and I
was
> wondering if
> someone could answer some questions.
> Is there a web thickness spec'd in the IPC specs
somewhere?
> Is
> there a
> thickness that some have just found to work from experience? We
can
> spec
> v-score depth, but I would rather spec an IPC standard. We have
> boards
> coming in with varying v-score depths, and some cannot be removed
> easily.
> Thanks.
>
> -Ryan Jennens
> TelGen Corporation
> (517) 887-6666 x151
>
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