When you tin the wire you have made it stiffer ( more brittle ). When you crimp the wire it is more prone to cracking. If you want to test this take 2 wires, tin one. then bend the wires back and forth a few times. -----Original Message----- From: [log in to unmask] [mailto:[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 ---------------------------------------------------------------------------------