Hi Dennis, I went through a similar exercise a few years back at a former employer when posed with the multiple setup/changeover dilemma (~32 different board sizes, mixed technology, machine inserted/placed components, batch processed, varying daily lot sizes). The chosen solution was to determine a standard panel size (sub-panel from fabricator's panel) for all boards and maximize the PCB usage per panel. Taking into account a typical keepout area of .5" around the panel perimeter used by the fabricator and other assembly necessitated factors, the resultant size of the 4 sub-panels was 11.2" x 8.45" -- which correlates to 2 sub-panels at 16.9" x 11.2" for your application. 4 different fabricators provided panels with these dimensions and far as I know, production is still running under this premise without any drawbacks. One point of note is that the layer counts were 4 or less and that higher layer counts may require more keep out area for the fabricator (thus the smaller dimensions as quoted to you). One other point, while I'm at it, is to determine what assembly processing allowances are required dependent on your equipment, transport/handling/ and fixturing that again will reduce the resultant PCB size. Good luck. Steve ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################