Item Subject: ASSY: PCMCIA Board Depanelizing
     Try scoring.  This works well with boards with straight edges.


______________________________ Reply Separator _________________________________
Subject: ASSY: PCMCIA Board Depanelizing
Author:  Non-HP-lucyr ([log in to unmask]) at HP-Vancouver,shargw2
Date:    10/9/96 4:58 AM


From: Lucy N. Rojao
Process Engineering and Development--Power Business Unit 
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Subject: ASSY: PCMCIA Board Depanelizing
     
Thank you,
Lucy N. Rojao
Phone: (416) 448-5866               Internet:[log in to unmask] 
Celestica Inc.
*** Forwarding note from EMADKHAN--TORVMFG1 10/02/96 12:31 *** 
To: LROJAO  --TORVMFG1
     
*** Reply to note of 09/30/96 17:28
From: EMAD KHAN
Subject: ASSY: PCMCIA Board Depanelizing
     
Here you go Lucy...this might help:
     
The most efficient depaneling techinque for PCMCIA cards is having an 
inline routing operation. The method can be extremely costly but yields 
great results with speed. Problems, however, can be incountered in 
panelizing PCMCIA cards. One may be restriced to three to six cards per 
panel due warpage issues. Normal inline routers can depanel 9 PCMCIA 
cards at a time. If the full capabilities of routing are not to be 
utilized then this might not warrant the costs involved.
     
Break-off tabs are farely reasonable. You would have to experiment with 
how many you would need to ensure stability in your panelization. 
Break-off tabs also leave a rough finish in your product. Another concern 
of break-off tabs is the possibility of introducing solder defects when 
ripping a tab off (especially on thin cards). One must also not position 
them close to any egde component (ceramic components in particular).
     
I would recommend a shearing machine for low to medium volume 
productions. Shearing can achieve quite tight tolerances with an 
excellent finish. Fixturing and the problem of edge components is a 
concern when implementing this type of process.
     
Regards
     
Emad O. Khan
Power Products Paneling Engineer
Depaneling Engineer (Site Support)
Advanced Products Mechanical Assembly Engineer
     
Process Engineering
Department 110
(416) 448-4738
     
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