That is really good information, Inge. Your "old man's gagging" is still invaluable.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Wednesday, August 17, 2016 5:04 PM
To: [log in to unmask]
Subject: [TN] SV: [TN] Harness bend radii
Hi Wayne, we have not exchanged illusions for years back. Good to hear your optimism, as allways. Am retired and not Active in busyness any longer, but will chat with you TN guys sporadically. You wonder what we at Ericsson and SAAB stoppped wondering long ago. We have created own rules and documents. We folllowed MIL C until we realized that those documents were updated only once per Century. When I was responsible for all wiring and connecting components, about 40 years ago, I had the luck to live only half an hour from Ericsson’s own Cable and wire manufacture. I learned quickly how poor the knowledge was and how poor the mounting instrucktions were. AsI am still classified, I can’t give you any papersfrom my company’s archive. If your busyness had some kind of benchmarking contracts, the situation had been different. I worked for RUAG, a Space industry, They are used to share experience. I’ll give you a name: Dr Lars Ryen / RUAG/Gothenburg/Sweden. Unfortunately my adress browser doesn’t work. I remember that the assembly people welcomed any instructions that clarified the difference between a good cabling documentation and its opposite. Finally, give you a tip: Used to study German DIN/VDN Cable assembly documents. German industries have no competition on Cable and wire assembly, they are outstanding. Hope an old man’s gagging gave you some light/Inge
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Från: Wayne Thayer - EXT
Skickat: den 17 augusti 2016 19:32
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Ämne: [TN] Harness bend radii
Hi All-
Finally back "in the saddle" after a tumultuous year. First, I got a fantastic job opportunity to move to the heart of the PNW. Worked my butt off for 7 months, then was let go. Then another sprint to see if I could find ANYTHING in the immediate area, which took another 2 months.
Anyway, here I am at Insitu, maker of premium recon/intelligence UAVs.
So here's the question:
IPC/WHMA-A-620B Table 14-1 lists different bend radii for "unshielded" vs "insulated (non-polyimide)" wires, but there is nothing in the "definitions" section to give me a clue as to how to tell the difference. Anybody know how we're supposed to interpret that? For the "S" version of the document, they pulled out the "insulated" line.
And here's a follow-up question:
Why isn't there anything on wire construction in the spec? The build-up of the wire makes a huge difference to whether a certain bend radius can damage a wire. For example, I'm looking at #12AWG, and I've found (#conductors/gauge each conductor) ranging from 19/25 to 665/40.
Thanks!
Wayne Thayer
Insitu Contract Engineer
Desk: xx-xxx-xxxx
Cell: 443-534-8036
E-mail: [log in to unmask]<mailto:[log in to unmask]>
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