DI rinse. Very little of the debris gets on the board because the water carries it away. The centrifugal force continuously flushes the water and debris to the outside. If you don't have the outside sponges set up properly to catch this, then you wear the debris! Wayne ________________________________ From: TechNet on behalf of Stadem, Richard D. Sent: Thu 10/25/2007 9:15 AM To: [log in to unmask] Subject: Re: [TN] Trimming left over excess "mouse bites" I did not realize you were grinding that wet. How do you keep the ground up fiberglass and copper away from the electronics? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne Sent: Thursday, October 25, 2007 8:08 AM To: [log in to unmask] Subject: Re: [TN] Trimming left over excess "mouse bites" An interesting point, but usually we don't worry too much about static buildup when doing things underwater. Not sure how that would work. It is distilled or DI water we use, so it's not real conductive, but I still think it will dissipate a static charge. If you even try to dry grind, the wheel will load up so quickly that it won't grind much. If I switch the wheel to wool and do it dry, then I'll bet I can get a good charge! Wayne Thayer ________________________________ From: TechNet on behalf of Stadem, Richard D. Sent: Thu 10/25/2007 8:42 AM To: [log in to unmask] Subject: Re: [TN] Trimming left over excess "mouse bites" 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 This email message and all attachments transmitted with it are intended solely for the use of the addressee(s) and may contain legally privileged, protected or confidential information. 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