Robert, Burr is when it gets really freaking cold on a flat Kansas/Oklahoma oil field; NOT Seriously: It is very common to have residual material (X, Y and Z) on a scored fab. Mechanical or manual depanelization does not matter on the amount of residual or burr material as you note it (yeah, you'll have some fibers, but not enough to skew your dimension check). Figure out the angle at which the Fab house is scoring the material, this helps and is sometimes standard. Modify you Mechanical Drawings to reflect new tolerances. For our fabs, I have defined +.000-.005 and +.005-.000 on either side of the board. These dimensions are very, very critical considering they go into Type I and Type II Smart cards (PCMCIAs). I am limited on the case dimensions. I take into consideration the residual (X or Y and not Z residual) following depanelization resulting from the fab score. The design was also moodified to ensure that components did not conflict with tight tolerances and mechanical depanelizing. Call me if you have other questions. John Gulley Inet Inc. 972.578.3928 ______________________________ Reply Separator _________________________________ Subject: [TN] BURR Author: Padmanabha Anandapuram Halappa <[log in to unmask]> at Internet Date: 1/16/98 12:39 PM Good day Folks, We face dimension problem after depanellise the v-scoring board. The board's thickness is 0.062" and the v-scoring remaining thickness is 0.015". After depanellise, the board dimension is found to increase by 0.01". According to the fab. house, this is caused by the burr (protrusion) after depanelling the board. Is there any standard spec. for the burr after depanelling the v-scoring board? What is the general dimension tolerance used in design the board with v-scoring? Thanks Robert ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################