Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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WKW WKW is offline
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Default Nichrome winding insulation question

I have two old soldering stations with burned out elements I want to
rewind. ( One is an old ungar they quit making ages ago but it was a good
iron ) I found some #30 Nikrothal 80-20 wire cheap on eBay which appears to
be the same length and resistance as the original. I just want to know what
kind of paint or insulating material to use to keep the wire from shorting
to the metal barrel or to neighboring turns ( They are both 24 volt
transformer units ). I took one elemant apart already and the coil is
sandwiched between to metal tubes about .02" apart.
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Default Nichrome winding insulation question

WKW wrote:

I have two old soldering stations with burned out elements I want to
rewind. ( One is an old ungar they quit making ages ago but it was a good
iron ) I found some #30 Nikrothal 80-20 wire cheap on eBay which appears to
be the same length and resistance as the original. I just want to know what
kind of paint or insulating material to use to keep the wire from shorting
to the metal barrel or to neighboring turns ( They are both 24 volt
transformer units ). I took one elemant apart already and the coil is
sandwiched between to metal tubes about .02" apart.


I am sure that you will receive replies from folks considerably more familiar
with heater construction than myself, but FWIW, please see how I worked with
soldering iron heaters to build an SMT hot air rework tool at:

http://www.cybertheque.org/homebrew/smt-rework-tool

I found that windings separated by ceramic spacers was typical in units
that I disassembled and I used refractory cement in my finished unit to
provide structural strength and thermal conductivity and thermal insulation
in appropriate places.

Michael
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Default Nichrome winding insulation question

msg wrote:

WKW wrote:

I have two old soldering stations with burned out elements I want to
rewind. ( One is an old ungar they quit making ages ago but it was a
good iron ) I found some #30 Nikrothal 80-20 wire cheap on eBay which
appears to be the same length and resistance as the original. I just
want to know what kind of paint or insulating material to use to keep
the wire from shorting to the metal barrel or to neighboring turns (
They are both 24 volt transformer units ). I took one elemant apart
already and the coil is sandwiched between to metal tubes about .02"
apart.



I am sure that you will receive replies from folks considerably more
familiar
with heater construction than myself, but FWIW, please see how I worked
with
soldering iron heaters to build an SMT hot air rework tool at:

http://www.cybertheque.org/homebrew/smt-rework-tool

I found that windings separated by ceramic spacers was typical in units
that I disassembled and I used refractory cement in my finished unit to
provide structural strength and thermal conductivity and thermal insulation
in appropriate places.


I forgot to mention that the internal insulation in all of the heaters I
cannibalized was mica -- in discs, sheets, bars, etc. Ceramics made up the
rest of the structural material. When inserted into the metal tube, the
spacers prevented any contact with heater wire.

Michael

Michael

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