Wayne,
Regarding the grinding wheel, how many thousand volts does this generate
into the PWB?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Thursday, October 25, 2007 7:21 AM
To: [log in to unmask]
Subject: Re: [TN] Trimming left over excess "mouse bites"
Jim,
This was a concern here too. The solution was to move the mouse bite in
from the edge so when snapped apart any leftover material did not
protrude past the edge of the board. I couldn't quickly find the
chapter and verse in the IPC specs, but I know it is there.
Phil Nutting
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne
Sent: Wednesday, October 24, 2007 10:11 PM
To: [log in to unmask]
Subject: Re: [TN] Trimming left over excess "mouse bites"
I use a $100 wood chisel grinder for this. The horizontal wheel turns
at about 400RPM, which is perfect for removing material quickly but
still being under good control. Also, its designed for wet grinding, so
the wheel doesn't load up too quick. I retrofitted this grinder with a
$300 320 grit resin backed diamond tool sharpening wheel, which needed a
little adapter to get it right. We need to clean the wheel, but pretty
rarely.
Wayne Thayer
________________________________
From: TechNet on behalf of West, Jim
Sent: Wed 10/24/2007 6:09 AM
To: [log in to unmask]
Subject: Re: [TN] Trimming left over excess "mouse bites"
Looking for any IPC standards or information concerning the removal of
excess board material left behind after depanelization, especially
breakaway/mouse bites? We have a situation where the left over material
causes the board dimensions to be out of tolerance, and was trying to
determine the best way to remove, and if there are any specific
standards we should adhere to.
Thanks,
Jim West
Engineering Manager
Nexergy Inc.
www.nexergy.com
tel: (614) 351-6216
fax: (614) 324-1979
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