Hi Technetters, I have a problem with cracked surface mount resistor network. The cracking occurs after de-panelisation. I have confirmed this electrically and visually (at up to x35 mag). The current fallout is about 5%. The board is 0..070" (1.8mm) thick and v-scored from both sides. De-panelisation is by means of a "bacon slicer" (rolling v-shaped blade approx 4" diameter). The network is located 0.032" (0.8mm) away from the v-groove. _____________________________________________________ V-score edge ____________________ | / \ | |____/ \____| | | ____| |____ | | Resistor network with diagonal cracks from stress points The question I have is: does anyone know of any guidelines with respect to minimum component mounting distance away from the v-groove in a situation like this? Also, is there an algorithm anywhere that can be used to calculate stress involved? Thanks Martin Christie ACW Technology Ltd., Hylton Road, Petersfield, Hants. GU32 3XX Tel: 01730 300000 ext 146 Fax: 01730 266045 e-mail: [log in to unmask] ############################################################## 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. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################