Hi Gene I guess the best is to maintain fixed grid while placing the component. You have to keep in mind about the DFM aspect, like maintaining same orientation (though not mandatory). I suggest you talk to your manufacturing department, they can give you best input to avoid manufacturing defects like solder bridging. Good Luck Trilok Budathoki trilok.budathoki@xxxxxx -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Gene Carman Sent: Tuesday, June 08, 2004 12:00 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] how do YOU handle component spacing rules? Is there a way to set a component type to component type rule? What I = mean is that certain component types tend to have different rules... = such as 0402 to 0402 verses 0402 to SOT or BGA. The only rules I have found are pad to pad... which does not allow for = different type rules. I spoke to some other designers and they offered two solutions: One is = to build visual indicators into the parts so you can tell if your 0402 = is too close to another 0402 or BGA... great, no DRC there. The other = solution is simply use grids and place them... again no DRC. I have different customers that require different spacings. One = customer wants 20 mils between 0402 pads, another wants 25. Customer 1 = wants 50 mils between BGA and 0402, customer 2 wants 40 mils between BGA = and any other comp. =20 With other tools I had the ability to assign components to a component = type and then assign rules of type to type. I don't see a way to do = that in Allegro (15.1) (very similar to net type rules in Allegro, for = component to component spacing) What do you do? ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at //www.freelists.org. Our list name is icu-pcb-forum or go to //www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx ----------------------------------------------------------- ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at //www.freelists.org. Our list name is icu-pcb-forum or go to //www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx ----------------------------------------------------------- ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at //www.freelists.org. Our list name is icu-pcb-forum or go to //www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx -----------------------------------------------------------