Re: Looking for resistive wire with shellac coating

On Sat, 27 May 2006 20:33:47 GMT, "Stumpy" <perilmung@xxxxxxxxxxx>
wrote:

Well, its very boring, but I'm simply making a ribbon controller. I've
considered monolithic materials, but they're hard to find without actually
buying and testing a lot of stuff. So by default I will wrap a
nonconductive core with resistance wire and then remove a portion of the
insulating surface.

Using the right words for a search helps. I did find suitable coatings by
looking up "insulating varnish". Now looking for one that does not require
heat treating. My wife is tired of experiments in the oven.

---
Well, OK!

Here's an old trick that might work for you:

Instead of winding a single uninsulated wire around the mandrel,
paint the mandrel with some varnish and while it's still wet wind
two separate strands of the wire around it, making sure the strands
stay parallel, touching, and tight until the varnish dries/cures.
Once it does, unwind one of the strands and Voila!, you're left with
a nice coil of uninsulated resistance wire with none of the turns
touching. Finish it by painting it with epoxy and wiping the epoxy
off of the contact surface before it cures, (so you won't have to
sand it off later) and there ya go!




--
John Fields
Professional Circuit Designer
.