This oxidized copper approach could add cost to the board since we fabbers now have to cover the fiducial <somehow> at HASL. We do have the means, but go explain that to the guy(s) placing dots all over the panels.... ______________________________ Reply Separator _________________________________ Subject: Re: ASSY: Polishing Fiducials Author: [log in to unmask] at INTERNET_GATEWAY Date: 11/12/96 2:13 PM Allen Hertz wrote: > > Pat, > > That concept works well. The term "Pink Pearl" was coined as the > processes since one would purchase a number of those little pink > erasers and go scrub fiducials. This was effective for HASL or other > tin-lead finished boards.Gold or OSP finsihes generally do not require > this operation. > > An alternative used was to place lighting under the board and change > the PCB layout by removing all metallization and resist around and > under the fiducial. The "backlighting" provides a silhouette, > eliminating any variations due to reflection. This is a major task, > especially for various board sizes. > > Regards, > Allen Hertz > [log in to unmask] > > ______________________________ Reply Separator _________________________________ > Subject: ASSY: Polishing Fiducials > Author: [log in to unmask] at ftl03 > Date: 11/12/96 12:48 PM > > >From the What Will They Think Of Next (WWTTON) dept: Another request we`ve had in this light (sic) is to leave the fiducials as bare copper, allowed to oxidize. Brings an OSP-look to a HASL PWB. Regards, -- Jeff Seeger Applied CAD Knowledge Inc Chief Technical Officer Tyngsboro, MA 01879 [log in to unmask] 508 649 9800 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************