Doug, 1. Multistrand Raychem TR 14 2. All 3. Scalpel, machines don't work, has to be done by hand. A rotating blade may do the job. Why is this 1/2D important at all? Imagine soldered or crimped eyelets on a power supply plinth. The distance between the screws is generally a centimeter or more. What does it matter if the insulation has withdrawn 1D or even 2.D ? Just a question of workmanship? Inge ----- Original Message ----- From: "Douglas Erb" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, June 05, 2009 10:32 PM Subject: Re: [TN] Cable insulation crimping Inge, I've been in the connector industry for over 25 years and have come across this from time to time. I believe that IPC has some guidelines for wire crimping, but this deals more with the area within the crimp than behind it. Questions: 1. Is this multi-strand or single strand wire? 2. What size is the wire? 3. How are you preparing the wire before crimping? Some times automated cut-and-strip machines stretch the insulation which later contracts, as you described. General "Best Practices" for space from the wire crimp to uncrimped insulation is 1/2x to 1x the wire diameter for low power applications and 1/2xDia Max in high power (>35 Vac). Doug Erb Senior FAE Hirose USA -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Sent: Friday, June 05, 2009 3:01 PM To: [log in to unmask] Subject: [TN] Cable insulation crimping Hi TN crickets (as to all the noise of underfill and coating) Our production want send back 10 kilometers of single power cords. Insulator is a single layer of Polyolefin. Now, when we crimp or solder these wires, the following happens: when bending and gathering wires into bundles for strapping and fixing them to chassis, the Polyolefn begins to withdraw from the connectors or single contact pin. It creeps a few millimeters and I think that won't have any kind of negative impact on electrical performance or reliability or what so everm The amount of withdrawal in our company std is set to be maximum one halv of the electrical wire diameterm. I found this being a weird requirment, because IPC says 3 times the diameter. 1) So, what do you think, is a little withdrawal of the Polyolefin insulator anything to bother about? 2) Do you know of a real good paper describing all about crimping . Molex, T&B and some others had, but covers only what makes money. Inge --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------