Mornin Y'all The new Cable and Harness specification, IPC-A-620 addresses this topic. "4.1 Wire Preparation, Tinning Note: Wires intended to be secured to threaded fasteners or crimp terminations shall never be tinned." There are other quotes if you would like to go back to the Mil Spec days. The justification is pretty close although we will need to add "crimpified" to the terms and definition committee agenda. Mel Parrish Soldering Technology International 102 Tribble Drive Madison, AL 35758 256 705 5530 256 705 5538 Fax [log in to unmask] www.solderingtech.com -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask] Sent: Thursday, May 16, 2002 6:46 AM To: [log in to unmask] Subject: [TN] Crimped connections All-knowing TechNet, Yesterday I rejected some assemblies that had wires crimped into lugs and attached to a TO-3 case. The inspector had noticed that the wires were also tinned and then had been crimped. I said to rework based on the knowledge that we had never tinned wires to be crimped. But when pressed for the reasons behind my decision, I was stumbling for an answer. All I could come up with is that perhaps the crimp would be less crimplified (new word) over time due to solder creep or temperature excursions since the solder might reflow to some degree. What is the reason or doesn't it really matter whether tinned or not? Did this Quality lug crimp his position as the local answer man? Thanks to the forum, Stu Korringa Quality Engineer Smiths Industries Electronic Systems Grand Rapids, Mi. ********************************************************************** This e-mail and any files transmitted with it are confidential and may be legally privileged or otherwise exempt from disclosure under applicable law. This e-mail and its files are intended solely for the individual or entity to whom they are addressed and their content is the property of Smiths Aerospace. If you are not the intended recipient, please do not read, copy, use or disclose this communication. If you have received this e-mail in error please notify the e-mail administrator at [log in to unmask] and then delete this e-mail, its files and any copies. This footnote also confirms that this e-mail message has been scanned for the presence of known computer viruses. *********************************************************************** ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------