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
 

---------------------------------------------------
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
-----------------------------------------------------