Same goes for us.  Our standard blade is 30 degrees.  If fab drawings
specify otherwise, and they often do, we ask if 30 would be OK and it always
is approved by the customer.

John Parsons

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Hodge
Sent: Wednesday, December 14, 2005 11:55 AM
To: [log in to unmask]
Subject: Re: [TN] <List>[TN] V-Scoring

We see most fab drawing call-outs at 30 degrees-some 45 degrees. We like to 
use 20 degree blades for scoring through plated edge castellation holes. I 
have never been asked for any angle larger than 45 degrees.

At 06:32 AM 12/14/2005, you wrote:
>Good Morning All,
>
>My question for today is as follows;
>
>IPC-SM-782A suggests the angle of the v-score (v-groove) be 90° max to 60° 
>min.
>
>The folks at Accusystems and V-Score Central prefer 30° with the following 
>quoted explanation;
>
>Blade Angles...
>You may have noticed the absence of the mention of larger blade angles 
>(45, 60, 90 degrees etc.). Although the data we have shown for 30 degree 
>blades can be extrapolated out for usage on other angles, we suggest you 
>consider the following;
>If there is no specific use for the bevel-type finish of a larger angle 
>blade, we contend that the clearance/leverage advantage that they offer 
>for separation, is a poor substitute for using the proper web thickness. 
>If this seems a little radical...then good! There are, of course, many 
>specific application blades that, for design reasons, must be used. Beyond 
>that however, there seems to be a great deal of confusion over blade 
>angles. As far as we can tell, larger blade angles appear to be a 
>throw-back to an earlier time when space was less of an issue, and Z-axis 
>control was not as precise as it is today. With today's designs, 30 degree 
>blades seem to offer the optimum balance of a narrow score path, ample 
>clearance for separation and acceptable blade life performance.
>
>Anybody care to weigh in on what is the best?
>
>I'm trying to define how our boards will be scored as we have had some 
>issues with boards from a new fabrication house.
>
>Thanks in advance.
>
>Phil Nutting
>
>
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