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Subject:
From:
Inge Hernefjord <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Inge Hernefjord <[log in to unmask]>
Date:
Thu, 18 Aug 2016 23:08:54 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (89 lines)
Thanks Richard,
You  guys, if  you are interested, thentry to get reprts from  the jumbo
that crashed near Nova Scotia some 25ear ago. Lots of wires, ables and
haness were bent in such a way that vibration created microcracks n he
insulation and...need not say more.. Bending wires should NEVER be
bagatelized, at least noot  forMIL products. I have insspected the rests
from burnt cables,and I encourage everone to handle wires and cables
seriously.

Inge

https://www.google.se/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiakLao78vOAhUKFSwKHRMpDjwQFggcMAA&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FSwissair_Flight_111&usg=AFQjCNFl4a2VtwYE6NOupPUGfgD5OMgz0w&sig2=N3e_9gl3b2J3RE3Gq8r2Zg&bvm=bv.129759880,d.bGg

On 18 August 2016 at 15:41, Stadem, Richard D. <[log in to unmask]>
wrote:

> 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
>
>
>
> Skickades från E-post för Windows 10
>
> Från: Wayne Thayer - EXT
> Skickat: den 17 augusti 2016 19:32
> Till: [log in to unmask]
> 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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