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'[EE] Stripping REALLY small wire'
2005\08\04@102619 by Mike Hord

picon face
I have some 38 ga stranded wire, PVC insulation, that
I need to strip reliably.  Current theories include using
the fork of a scissor, fire, or a knife edge.  No wire
stripper I have here available comes even close to
being small enough.

Once stripped, it needs to be solderable, so fire is
an iffy proposition.  Any ideas?

Mike H.

2005\08\04@112849 by Bill & Pookie

picon face
Maybe "grind" the involution off.'.  Squeeze wire between two paces of emery
paper and pull it out?

Else, maybe solder it without stripping.  Place in a cup like a DB9 solder
pin and put solder in cup also.  See if that will make electrical
connection.  Crimp cup for mechanical connection.

Maybe....

Bill

{Original Message removed}

2005\08\04@114513 by Mike Hord

picon face
> Maybe "grind" the involution off.'.  Squeeze wire between two paces of emery
> paper and pull it out?

That's not a half bad idea.  I'll give it a shot- maybe it'll work...

> Else, maybe solder it without stripping.  Place in a cup like a DB9 solder
> pin and put solder in cup also.  See if that will make electrical
> connection.  Crimp cup for mechanical connection.

Most crimps will be too large for the final app- ultimately, the smallest
IR LED I could find will be soldered to the end and it'll be hung on a
mouse (!).  However, dipping the end in a blob of molten solder may
have the desired effect, both tinning the end and causing the
insulation to melt and shrink away from the end.

Mike H.

> Maybe....
>
> Bill

2005\08\04@115109 by Carey Fisher - NCS

face picon face

  > -----Original Message-----
  > From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu]On Behalf
  > Of Mike Hord
  > Sent: Thursday, August 04, 2005 10:26 AM
  > To: Microcontroller discussion list - Public.
  > Subject: [EE] Stripping REALLY small wire
  >
  >
  > I have some 38 ga stranded wire, PVC insulation, that
  > I need to strip reliably.  Current theories include using
  > the fork of a scissor, fire, or a knife edge.  No wire
  > stripper I have here available comes even close to
  > being small enough.
  >
  > Once stripped, it needs to be solderable, so fire is
  > an iffy proposition.  Any ideas?
  >
  > Mike H.
  >
Fire will work - it leaves a little bit of "soot" which
is easily wiped off.  Are you sure it's PVC and not enamel?
There are acid gel strippers for enamel.  Maybe for PVC too
but then you have to neutralize the acid which is a mess.

Also, with PVC insulation on that small a wire,
I usually use my fingernails like a stripper.
Of course, I'm not doing production when I do that.

If this is for production, you really should buy a proper stripper.

Carey Fisher


2005\08\04@115151 by Alan B. Pearce
face picon face
> I have some 38 ga stranded wire, PVC insulation, that
> I need to strip reliably.  Current theories include using
> the fork of a scissor, fire, or a knife edge.  No wire
> stripper I have here available comes even close to
> being small enough.

Heated stripping tweezers are about the only option to do this without
damage.

2005\08\04@123238 by Mike Hord

picon face
>    > I have some 38 ga stranded wire, PVC insulation, that
>    > I need to strip reliably.  Current theories include using
>    > the fork of a scissor, fire, or a knife edge.  No wire
>    > stripper I have here available comes even close to
>    > being small enough.
>    >
>    > Once stripped, it needs to be solderable, so fire is
>    > an iffy proposition.  Any ideas?
>    >
>    > Mike H.
>    >
> Fire will work - it leaves a little bit of "soot" which
> is easily wiped off.  Are you sure it's PVC and not enamel?
> There are acid gel strippers for enamel.  Maybe for PVC too
> but then you have to neutralize the acid which is a mess.

It MAY not be PVC, but it is DEFINITELY not enamel.

> Also, with PVC insulation on that small a wire,
> I usually use my fingernails like a stripper.
> Of course, I'm not doing production when I do that.

Current best method involves the crook of a "squeezer"
type surgical scissor.  If I bend the wire into a "U" over
the crook, then tug the tag end, it seems to do a great
job of stripping it.  Sample size = 2, though, so grain
of salt.

> If this is for production, you really should buy a proper stripper.

Not production, per se, because at most perhaps a dozen
of the final assemblies will be made.  At a wire cost of $1/ft,
we aren't going overboard on these.

Mike H.

2005\08\04@125238 by KY1K

picon face
At 12:32 PM 8/4/2005, you wrote:
> >    > I have some 38 ga stranded wire, PVC insulation, that
> >    > I need to strip reliably.  Current theories include using
> >    > the fork of a scissor, fire, or a knife edge.  No wire
> >    > stripper I have here available comes even close to
> >    > being small enough.
> >    >
> >    > Once stripped, it needs to be solderable, so fire is
> >    > an iffy proposition.  Any ideas?


A solder pot strips the insulation off without damaging the wire. It can be
a very small solder pot-when I was doing prototyping I made up a soldering
iron tip that held a small ball of solder and used it for cleaning the
shellac off. The wire is not damaged in any way, it's clean, fast and easy
to tin after the insulation is gone.

For thicker insulation (pvc) that might smell up the workshop when it
burns, use a heated wire (22 gauge) stretched between the two terminals of
a soldering gun to selectively melt the insulation and quickly pull the
insulation off while the PVC is still hot and soft.

Enjoy.

Art


2005\08\04@145243 by Philip Pemberton

face picon face
In message <88eca922050804072657e3fedcspamKILLspammail.gmail.com>>          Mike Hord <.....mike.hordKILLspamspam.....gmail.com> wrote:

> I have some 38 ga stranded wire, PVC insulation, that
> I need to strip reliably.  Current theories include using
> the fork of a scissor, fire, or a knife edge.  No wire
> stripper I have here available comes even close to
> being small enough.

38ga? Wire wrap wire?
Get one of those wire-wrapping tools from Radioshack - the ones that look
like a screwdriver (me assuming you're in the USA here). Pop off the back and
there's a wire stripper inside. Try that - it might work.

Later.
--
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EraseMEphilpemspam_OUTspamTakeThisOuTphilpem.me.uk              | Athlon64 3200+ A8VDeluxe R2 512MB+100GB
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... I haven't lost my mind; it's backed up on tape somewhere!

2005\08\04@145245 by Philip Pemberton

face picon face
In message <LBEPLKFEBBNDFCDODFFGOENFGFAA.careyfisherspamspam_OUTncsradio.com>>          "Carey Fisher - NCS" <@spam@careyfisherKILLspamspamncsradio.com> wrote:

> There are acid gel strippers for enamel.

Soldering iron, 350 deg. C, with solder on the tip. Push the wire into the
solder blob, then watch as it gets stripped and tinned at the same time. Use
a knife edge to remove the bead of charred enamel.

Later.
--
Phil.                              | Acorn RiscPC600 SA220 64MB+6GB 100baseT
KILLspamphilpemKILLspamspamphilpem.me.uk              | Athlon64 3200+ A8VDeluxe R2 512MB+100GB
http://www.philpem.me.uk/          | Sony MZ-N710 NetMD Minidisc
... Feet Smell?  Nose Run?  Hey, you're upside down!

2005\08\04@173648 by Mike Hord

picon face
> > I have some 38 ga stranded wire, PVC insulation, that
> > I need to strip reliably.  Current theories include using
> > the fork of a scissor, fire, or a knife edge.  No wire
> > stripper I have here available comes even close to
> > being small enough.
>
> 38ga? Wire wrap wire?
> Get one of those wire-wrapping tools from Radioshack - the ones that look
> like a screwdriver (me assuming you're in the USA here). Pop off the back and
> there's a wire stripper inside. Try that - it might work.

This stuff makes wire wrap look like hawser.

For comparison, last time your doctor ordered a nurse
to draw blood from the vein in your elbow, this wire would
probably have fit quite neatly inside the needle used.

I tried the solder blob method- my iron must not have been
hot enough.  Didn't get much satisfaction from it.

Mike H.

2005\08\04@193454 by Larry G. Nelson Sr.

picon face
How about thermal wire strippers?


At 09:26 AM 8/4/05 -0500, you wrote:
{Quote hidden}

>

2005\08\04@210204 by Richard Prosser

picon face
Paint Stripper, then wash & wipe?
RP

>
> At 09:26 AM 8/4/05 -0500, you wrote:
> >I have some 38 ga stranded wire, PVC insulation, that
> >I need to strip reliably.  Current theories include using
> >the fork of a scissor, fire, or a knife edge.  No wire
> >stripper I have here available comes even close to
> >being small enough.
> >
> >Once stripped, it needs to be solderable, so fire is
> >an iffy proposition.  Any ideas?
> >
> >Mike H.
> >
> >--

2005\08\05@061228 by Alan B. Pearce

face picon face
>> There are acid gel strippers for enamel.  Maybe for PVC too
>> but then you have to neutralize the acid which is a mess.
>
>It MAY not be PVC, but it is DEFINITELY not enamel.

If it is PTFE then the heated stripping tweezers are just about the only way
to go for a nice clean removal of the insulation. If you have difficulty
melting it with a soldering iron then it is almost definitely PTFE, or one
of the halogen free compounds (which are even worse to strip).

2005\08\05@075619 by Mike Hord

picon face
> Paint Stripper, then wash & wipe?
> RP

Intriguing.  If it would dissolve, that'd make things
easy...I wonder if we have any paint stripper lying
about.

Mike H.

2005\08\05@095332 by John Ferrell

face picon face
Caution: Paint stripper is usually Meythl Cloride, nasty stuff! Read & heed
the label.

John Ferrell
http://DixieNC.US

----- Original Message -----
From: "Mike Hord" <RemoveMEmike.hordTakeThisOuTspamgmail.com>
To: "Microcontroller discussion list - Public." <spamBeGonepiclistspamBeGonespammit.edu>
Sent: Friday, August 05, 2005 7:56 AM
Subject: Re: [EE] Stripping REALLY small wire


>> Paint Stripper, then wash & wipe?
>> RP
>
> Intriguing.  If it would dissolve, that'd make things
> easy...I wonder if we have any paint stripper lying
> about.
>
> Mike H.
>
> --

2005\08\05@130821 by Peter

picon face

On Thu, 4 Aug 2005, Mike Hord wrote:

> I tried the solder blob method- my iron must not have been
> hot enough.  Didn't get much satisfaction from it.

Your insulation is almost certainly teflon or kapton. I know no
non-mechanical ways to strip it.

Peter

2005\08\05@171302 by Mike Hord

picon face
> > I tried the solder blob method- my iron must not have been
> > hot enough.  Didn't get much satisfaction from it.
>
> Your insulation is almost certainly teflon or kapton. I know no
> non-mechanical ways to strip it.

The scissor crook method seems to be working fairly well, with
some practice.  I guess it'll have to do.

Mike H.


'[EE] Stripping REALLY small wire'
2006\05\03@084645 by Russell McMahon
face
flavicon
face
> I have some 38 ga stranded wire, PVC insulation, that
> I need to strip reliably.  Current theories include using
> the fork of a scissor, fire, or a knife edge.  No wire
> stripper I have here available comes even close to
> being small enough.
>
> Once stripped, it needs to be solderable, so fire is
> an iffy proposition.  Any ideas?

Solderpot if the insulation is cooperative. PVC may behave .

Fire works well and is more or less solderable afterwards but with 38
ga care is needed to avoid 100% magic smoke. Fire followed by solder
pot with suitable fluxing would work.

Scraping works but is not a nice production method :-).
Do you really mean PVC?


       Russell McMahon


2006\05\03@090421 by Bob Axtell

face picon face
Russell McMahon wrote:
{Quote hidden}

I never saw the original post.

Fire will cause the copper wire to actually burn unless carefully
controlled.

The solder pot is really a good way to do it, except that handling the wire
while dipping it. You might need to design a  solder pot that is deep  but
very small in diameter, maybe even 5-6mm.

One problem with high temperatures to remove insulation... Some insulation,
such as teflon, is highly toxic when overheated.

--Bob


2006\05\03@103252 by Mike Hord

picon face
{Quote hidden}

Original post was ~ 9 months ago.  In point of fact, I've been out of that
job for about 5 months now.  But...

Yes, IIRC, it really WAS PVC.  Stranded wire, with the strands quite a
lot thinner than hair.  What I finally came up with was squeezer type
surgical scissors, with the wire being drug back through the V of the
scissor.  It worked very well 99% of the time, even if it WAS a bit
painstaking.

Mike H.

2006\05\03@103958 by Mauricio Jancic

flavicon
face
Sorry for the odd words. English is not my native language.

Try two *almost* parallel and very sharp cutter blades, like this:

* *              * *
*  *       *  *
*   *     *   *
*    *   *          *
*        * *     *
*        * *          *
*        * *          *
*        * *          *
*        ***          * <---- This avoids the wire from going away the blades.
*        ***          *
*        ***          *
***************

    >| |<-- This separation has to be that of the *core* of the wire

So, the procedure is to insert the wire in the middle of the two blades and
then pull it toward the way you want the insulation to remain intact.

The blades must be very sharpened like a medical bistoury.

Mauricio Jancic
Janso Desarrollos
http://www.janso.com.ar
TakeThisOuTinfoEraseMEspamspam_OUTjanso.com.ar
(54) 11-4542-3519


> {Original Message removed}

2006\05\03@114203 by Dwayne Reid

flavicon
face
At 08:32 AM 5/3/2006, Mike Hord wrote:

>Original post was ~ 9 months ago.  In point of fact, I've been out of that
>job for about 5 months now.  But...
>
>Yes, IIRC, it really WAS PVC.  Stranded wire, with the strands quite a
>lot thinner than hair.  What I finally came up with was squeezer type
>surgical scissors, with the wire being drug back through the V of the
>scissor.  It worked very well 99% of the time, even if it WAS a bit
>painstaking.

I recently (last week) had to make some thermocouples using 38 or 40
AWG teflon-insulated K-type thermocouple wire.  I used what I had
previously suggested: Thermo-Kinetics thermal wire strippers.  Worked
perfectly every single time - no problems whatsoever.  Squeeze, pull, done.

I suspect it worked so well for me 'cuz the wire was solid
conductors, not stranded and because the teflon stayed intact during
the stripping process.  Not sure how well it would have worked with
PVC jacket and stranded copper conductors.

dwayne

PS - I have extra packages of those thermal stripper blades if anyone
needs.  They appear to be difficult to find and I wound up purchasing
25 sets just to get a decent price.

dwayne

--
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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2006\05\03@143230 by Peter

picon face

Mauricio, is this not the tool used to strip wire wrapping wire ?

Peter

2006\05\03@150825 by Mauricio Jancic

flavicon
face
Perhaps, I think I might have one. However, I was suggesting it based on a
tool I have to build for a need here in the factory.

Mauricio Jancic
Janso Desarrollos
http://www.janso.com.ar
infoEraseMEspam.....janso.com.ar
(54) 11-4542-3519


{Quote hidden}

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