Johannes, P/N = Part Number Aperture Wheel = Definition carried over from the time that photoplotters used an actual wheel with openings (apertures) corresponding to the pad/trace geometry. With laser plotting now the norm, the listing of plotter shape definitions is now commonly referred to as the Aperture Wheel. Program/Script = A method of automatic loading of customer aperture definitions into CAD or photoplot systems. These tend to be very specific to the systems in use and are typically generated by the fabricator. With a standard aperture wheel, only one script would be required. If your design system can output Gerber files per RS-274X, your supplier should be able to autoload apertures from these files. -----Original Message----- From: Johannes Sivula [mailto:[log in to unmask]] Sent: Friday, May 08, 1998 10:06 AM To: [log in to unmask] Subject: [TN] Aperture Wheel ? P/N ? Hi, Perhaps there is someone who knows what this is about: We tried out a new pcb supplier. The first protos were fine, and we purchased a bigger batch. Even these pcb?s looked fine, with an exception; All the pads were rounded, so they haven`t used our apertures at all !! Rounded apertures are for my part OK, but question remains, how this could possible happen. I asked this question and I got this as an answer: "The reason of the problem is human error. For any new P/N we load the Aperture Wheel in our Cad system in this case the operator made a mistake ( didn't consider the shape 1-2). To avoid this problem on the future production, we propose: -Aperture wheel standard -Specific program-script to load the aperture wheel in automatic way in our Cad system" Forgive my ignorance, but I don`t know what is: -P/N -Aperture Wheel -Which kind program-script is he/she referring to ? I am asking this because so far I haven`t got the answer from the supplier. I am just curious. Brs, JoSi ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################