Hi Tenison, For assembly it's hard to say, as it depends very much on how well you've controlled your processes. If you normally build class 3 products and never have to do touch-up, there 's not much savings by making the switch to a lower quality class. For the bare boards, positional accuracies could become an issue. For example you can have a situation where class 3 requirements for annular ring can not be achieved with the larger (economic) production panels because production tolerances are too large to meet the spec on the outer edges of the productionpanel. Switching to a lower quality class will save you some money then. Of course this depends on the robustness of the design. Kind regards, Daan Terstegge SMT Centre Signaal Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> Tenison Stone <[log in to unmask]> 10/11 2:41 pm >>> I need the expertise and experience of techies today. What is the typical cost difference if I build class 1 product and want to change to class 3? For instance, my class 1 board cost $10.00 to build, what would be the cost to build this board to class 3? Thank you for your help. Tenison Stone Telex Communications --------------------------------------------------------------------------------- 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 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 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------