Hi Ken, A plea from a former Lamination Engineer. Use any spacing you like but leave some copper in the gap to avoid a low pressure area and wrinkles if they use foil lam. The venting/theft pattern should be offset from one layer to the next. This avoids creating high spots. The CAM guys & gals used to kill me with huge gaps. Besides, all that etched off copper costs them money - chemistry or energy. Do they have their plating line under control? The plating thickness cross the panel might vary significantly around the panel's edges I'm befuddled. Aren't they routing the boards - why would one board be harder to remove than another? Hans Integrity First - Service Before Self - Excellence in All We Do ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hans M. Hinners Electronics Engineer Warner Robins - Air Logistics Center (WR-ALC/LUGE) Special Operations Forces System Program Office (SOF - SPO) Gunship Team 226 Cochran Street Robins AFB GA 31098-1622 mailto:[log in to unmask] Com: (478) 926 - 5224 Fax: (478) 926 - 4911 DSN Prefix: 468 -----Original Message----- From: Ken Patel [mailto:[log in to unmask]] Sent: Monday, November 12, 2001 1:04 PM To: [log in to unmask] Subject: [TN] Spacing between board to board that has mouse/rat bite design... All, My fab house is recommending 0.062" spacing between the boards on a subpanel. I am using mouse-bite or rat-bite. As there are 5 boards per subpanel, I would like to get opinion on the recommended spacing between the boards and NOT between the board and throw away tabs. Here that hangover needed to removed from both boards and if it's only 0.062" wide then I believe it will be a bit little difficult to remove from the second board once removed from the first board. ________________________ Board #1 ________________________ this spacing ________________________ Board #2 ________________________ and more.... Any suggestion will be highly appreciated. Re, Ken Patel --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------