Kynar tape around magnets?

[David King]

I hear that kynar is thin and incredibly tough as an insulating material. It should be ideal for wrapping around magnets before winding.
Is anyone here using it?
Does anyone have a source for 1/2" wide tape.
Thanks

[Joe Gwinn]

Does anyone have a source for 1/2" wide [kynar] tape.

It is sold as a self-stick tape for protecting gold-plated fingers on printed circuit boards from wave soldering, so I would look into suppliers of soldering supplies.

[DrStrangelove]

Kapton tape source

It is sold as a self-stick tape for protecting gold-plated fingers on printed circuit boards from wave soldering, so I would look into suppliers of soldering supplies.

You may mean Kapton, and it is certainly very tough.

Kapton tapes are available from C.S.Hyde in widths appropriate
for pickup building, namely 1/4, 3/8, 1/2, 3/4".

http://www.cshyde.com/tapecat.htm

I would guess that thinner is better since you want a winding
as close as possible to the magnet.

-drh

[David King]

Ah yes Kapton, it certainly looks like the same stuff and they both have that handy 500º heat resistance for when the guitar catches fire mid-solo.

Price is right too. Thanks guys.

[bbsailor]

Teflon Plumbers Tape

Why not try Teflon plumbers tape available at any hardware store?
It is very thin and has a dielectric constant near 2. I believe it is available in a0.5 inch width.

Joseph J. Rogowski

[Dave Kerr]

Why not try Teflon plumbers tape available at any hardware store?
It is very thin and has a dielectric constant near 2. I believe it is available in a0.5 inch width.

Joseph J. Rogowski

Someone here reported trying teflon tape with poor results, the wire apparently would tear the tape and short out on the magnets.

[DrStrangelove]

Why not try Teflon plumbers tape available at any hardware store?
It is very thin and has a dielectric constant near 2. I believe it is available in a0.5 inch width.

Hello, sailor.

Under the pressure of several thousand windings of hair-thin wire,
the teflon tape sometimes deforms and cuts through often enough
to be a quality control issue.

-drh

[David Schwab]

Hello, sailor.

You need a Mae West avatar now.

[bbsailor]

US Plastics Corp Resources

A company called Unites States Plastics Corp has products that may help pickup makers improvise parts.

They have a 3/16" ID X 1/4" OD X 1/32" wall Teflon FEP Tubing at the following web link.

http://www.usplastic.com/catalog/var...ant%5Fid=58081

This tubing could be cut into individual lengths to match the pickup coil height, slipped over each magnet and provide a good, thin insulation layer.

Joseph J. Rogowski

[bbsailor]

You need a Mae West avatar now.

Hey Strangelove: Is that a pickup in your pocket or do you want to make some music?

A little good humor is always welcome and is also a good ice cream.

Joseph J. Rogowski

[David King]

I've looked at a lot of thin walled tubing options and none are thin enough in my opinion. The best I could do was .007" kynar heatshrink but that stuff costs an arm and a leg compared to this tape with is about 2 mils including the adhesive.

The tfe plumbers tape is most definitely not up to this task.

Kapton and kynar are trade names, I think polymide is the generic...

[Possum]

....

the tubing I don't think would work, its my opinion that where the wire shorts out is where the magnet meets the forbon, I could be wrong but in my experience if you glue the magnets in and have a fat fillet there it won't short out. Plain old cellophane tape works fine, Guitar Jones sells or at least used to sell some black cellophane type tape that I use, still have a bunch of rolls left from 5 years ago. Doesn't need to be anything exotic. There is also a yellow 3m tape used alot in the 70s that still exists for wrapping coils that would work too, I see it on Ebay now and then....

[David King]

Well it's supposed to work but I just got a set of pickups installed, now cast in epoxy, where it apparently didn't... I didn't wind them but someone did them for me as a favor and much to my surprise two of the four coils were grounded out despite glue fillets and cellophane tape...

[Possum]

....

I wonder what kind of tape the Guitar Jones stuff is, it sure works, I can't find anything similar online right off the bat, my stash is getting old too, I'll ask if he still carries it.....

[DrStrangelove]

I've looked at a lot of thin walled tubing options and none are thin enough in my opinion. The best I could do was .007" kynar heatshrink but that stuff costs an arm and a leg compared to this tape with is about 2 mils including the adhesive.

Kynar is also used in piezoelectric contact microphones.
Unless you wind on the tight side,
it may be a source of microphonic noise.

Kapton is your friend.
Nevermind about calling it polyimide film.
All polyimide resin feedstock comes from the same US vendor.

For the moment, polyimide == Kapton in the same manner
that polytetrafluoethylene (PTFE) was Teflon until the patent expired.

-drh