John, Two fiducials are required for correcting both the X-Y position and the Theta position in the auto-placement machine. However, most theta error can be corrected by the global fiducials. Thus, you only need single fiducial to correct the X-Y position for your fine pitch devices. Hope This Helps Michael Yuen ---------- From: TechNet-request To: technet Subject: ASSY: Fiducials Date: Monday, October 14, 1996 9:11AM Address, From past design reviews we have always used 2 fiducials per 15mil and 20mil SMT devices (my opinion, standard). Recently our designers are placing 1 fiducial in the center of the device location. I'm not an agreement with this change due to possible lead skew on pads and similar problems. Has visual P&P equipment changed such, that 2 fiducials are no longer required or none at all. Please advise. John Gulley *************************************************************************** * 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. * ***************************************************************************