Ross, One thing I have learned over the years is keep it simple. Put what you need to put on the print and always try and be as specific as possible. I think you will find that most board shops have a very good understanding GDT. Another thing you should consider is your receiving inspection area. Don't forget, that whatever you put on your drawing, your own personnel will have to work with as well. Just my thoughts... Ed Cosper Director Quality Assurance and Engineering Graphic Electronics Inc. Tulsa OK ---------- From: Ross A. Eskite[SMTP:[log in to unmask]] Sent: Monday, April 13, 1998 3:36 PM To: [log in to unmask] Subject: [TN] Geometric dimensioning & tolerancing Greetings- We are currently in the midst of a lively discussion in our CAD department over the pros and cons of geometric dimensioning and tolerancing (GDT) when used on PWB fabrication drawings. From what I've seen: Pros: More accurate (potentially) Provides maximum producibility in achievement of desired fit (when competently applied) "Encouraged" by IPC Cons: Poorly understood by many draftsmen Poorly understood by some board shops (this bothers me) Takes longer to produce a drawing Many consider it "overkill" I'd like some feedback from other designers, board shops, ME's, etc., on this issue. Has anyone had any compellingly positive or negative experiences with GDT? Would you write it into *your* PWB CAD process? TIA, -- Ross Eskite "Though I fervently recite the Mass in perfect Latin to the cannibals, somehow I always end up in the big black pot with the carrots" - me ################################################################ 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 ################################################################