David: For standard technology and screened soldermask we prefer a soldermask clearance of .008mls For higher technology pcb's and liquid photoimageable mask we prefer a mask clearance of .004mls although tighter clearances are achieved.. A 1:1 will bleed mask on pads and or in the holes. These are general guidelines. Our CAM dept. generally check the design out for soldemask clearances making sure no adjacent traces/pads are exposed depending upon the thickness of the pcb and soldermask. Sona Sitapara Fineline Circuits Inc. > David Hoover wrote: > > I am in the middle of a discussion/debate with assemblers on one side and > > designers on the other. > > > > The question is: > > What would your shop prefer to receive from the designer for soldermask > > features? > > > > either > > A) 1:1? (Soldermask clearance same as the holesize, padsize, > > surfacemount, or > > clearanced feature size) > > or > > B) Soldermask Clearance set at some value over the pad/feature/SMT size? > > (Like 3 mils per side) > > > > Thanks for any and all responses, > > > > David Hoover > > --------------------------------------------------- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > > To unsubscribe, send a message to [log in to unmask] with following text > > in the BODY (NOT the subject field): SIGNOFF Technet > > To temporarily halt or (re-start) delivery of Technet send e-mail to > > [log in to unmask]: SET Technet NOMAIL or (MAIL) > > To receive ONE mailing per day of all the posts: send e-mail to > > [log in to unmask]: SET Technet Digest > > Search the archives of previous posts at: http://listserv.ipc.org/archives > > Please visit IPC web site > > http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > > ext.5315 > > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------