Joe,
I would be more concerned as to the fumes given off by the burning of the
lacing. Some of these fumes may be noxious, not to mention the odor.
Possible use of fume extraction to alleviate.
I know sometimes that the melting of the lacing can build up, creating a
large "knob". This could cause interference with final assembly, ie
connectors, strain relief's, etc.
Conclusion # 1 Metcal tips do cost, using old tips is way to go if
"burn-back" is used.
Conclusion # 2 could happen if process allows for both soldering and
burn-back during same task and same tool. Either way scissors or another
tool will result in "tool-pickup" and extra cycle time. However,
possibility exists that scissors or cutters can "nick" wire depending on
operators.
Your conclusion # 3 is one that I myself would be more concerned over.
Tom Braswell
Manufacturing Engineer
Fawn Electronics
6441 East NC 97
Elm City, NC 27822
Ph: (252) 977-8745
Fx: (252) 977-3477
Email: [log in to unmask]
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kane, Joseph E
Sent: Monday, March 15, 2004 7:28 AM
To: [log in to unmask]
Subject: [TN] Burning Or Cutting Lacing Cord
Need an opinion about the practice of cutting lacing cord (waxed
and unwaxed) used to support or secure wire bundles.
At a customer's request, we're thinking about outlawing the
use of hot-tweezers (wire strippers), or more commonly soldering irons
to cut the ends, and require use of scissors or cutters only.
Operators have been using the side or end of the soldering iron
tip for years. The iron may fit more easily into tight areas, and
it can save time to "burn" down a row instead of cutting individual
tie ends.
Perceived drawbacks to the practice:
1. Residue fouls the iron tip. Some operators use an iron with
an old, oxidized tip just for this purpose, but some don't keep
a spare iron, and have to clean off the residue. Customer is concerned
about contamination of the solder joint.
2. Solder balls from the tip can stick to the lacing cord, maybe
drop off and become conductive FOD.
3. Soldering iron can nick wires or other structures, damage
insulation.
I think that #1 is bogus - I don't think the solder joint can be
contaminated by nylon residue, and if the tip won't tin, the operator
can't make a decent solder connection. Of course, fouled tips could be
costing us money (we use Metcals).
Issues 2 and 3 may have more traction, but these conditions are
rejectable now. We have no data to suggest that this is costing
us in rework, or escaping into the field.
Any strong feelings either way?
-Joe
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Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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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 847-509-9700 ext.5315
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