It would be my understanding that all customer drawings are requirements That overrule IPC/J-std. IPC-A-610 is merely a pictorial document that is derived from J-STD. With other areas not covered such as cleanliness req. or Markings etc. I believe that I would move create a deviation for those devices and still follow Class III in all other areas as long as you say that I would not violate and Electrical clearance issues. Of course, all have their own interpretations. Barry. -----Original Message----- From: Marsico, James [mailto:[log in to unmask]] Sent: Thursday, October 31, 2002 6:41 AM To: [log in to unmask] Subject: Re: [TN] Lead protrusion Correct me if I'm wrong, but I thought that the drawing only overrules the spec (J-STD-001) only when it is approved by the customer. Jim Marsico Senior Engineer Production Engineering EDO Electronics Systems Group [log in to unmask] <mailto:[log in to unmask]> 631-595-5879 -----Original Message----- From: Graham Collins [SMTP:[log in to unmask]] Sent: Thursday, October 31, 2002 8:34 AM To: [log in to unmask] Subject: Re: [TN] Lead protrusion Hi Keith We build some similar stuff. You have two options other than the hand trimming: Run the DIP packages through a forming and trimming machine, to trim the leads to an acceptable length. This is typically what we do, so we end up with enough lead that the CS-400 can crimp it but not too much for protrusion. Alternatively - have a drawing note added to increase the allowable lead length to 90 thou or whatever is reasonable in the applications you have. The drawing note overrules the IPC requirement, so you are in the clear. regards, Graham Collins Process Engineer, Northrop Grumman Canada Corporation Halifax (902) 873-2000 ext 6215 >>> [log in to unmask] 10/31/02 09:04AM >>> We are having a vigorous discussion about how to deal with lead protrusion on our thru hole boards. We build mainly IPC class 3 boards, and have two Contact Systems CS400-D thru hole insertion machines that we use to populate these boards. Discrete parts are not a problem, as the leads are crimped to retain the parts in the boards for wave soldering. Our area of concern is DIP packages along with sockets, and connectors. When we insert DIPs we clinch two opposing corner pins, connectors and sockets are retained with temporary solder mask (goop). we are finding that the leads on these parts tend to exceed the max lead protrusion permitted for class 3 boards when used in .06 nominal thickness boards, but do not want to get into the quagmire of trimming leads and inspecting or reflowing after trimming. These boards will meet the class 2 requirements, and there is no danger of violating the minimum electrical spacing requirements when these boards are installed in our systems. Anyone else having this problem? If so, how did you resolve it? Your support is greatly appreciated. Keith Calhoun Manufacturing Engineer Sierra Research, an Integrated Defence Technologies company 485 Cayuga Road PO Box 222 Mail Stop 334 Buffalo New York 14225 USA Fax: (716)631-7849 Work: (716)631-6434 <[log in to unmask]> --------------------------------------------------- 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------