Re: [TCML] secondary coil form

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

I've had good success with PVC ducting at sizes of 6", 8" and 12".   
I've been getting it from McMasterCarr - where it has been fairly 
costy.  I could probably have found some locally at one of the salvage 
yards in San Jose for less.  But ordering it from McMaster has been very 
reliable.   I've generally had to cut it down to size myself, which is 
easily accomplished with a router and a jig.

The PVC is gray.  All the ducts I have acquired were made by the Harvel 
company.

What I usually do is sand the surface first, being careful to remove the 
manufacturers markings as it has been suggested here on TCML that those 
markings may in some way be conductive.

After sanding, I coat the duct with Glyptal Red taking care to keep the 
finish smooth.  This provides some "grip" for the winding process and 
tends to lock the secondary turns in place as long as there is tension 
applied.  It also looks cooler.

Some pics of my process are available here.   This is a starting point 
<http://www.flickr.com/photos/iceowl/5948339414/in/photostream/>, you 
can scan  through to see the development.

Cheers,
Joe



On 2/13/2012 6:21 AM, Carl Noggle wrote:
> Thanks, David,
>
> I didn't know about duct PVC tubing.  Sounds ideal.  Did you wind the 
> wire into epoxy or wind it on "dry", and did you varnish the coil 
> afterwards?
>
> If I get the kind of performance in your videos, I'll be mondo happy.  
> Then I'll have to find a good name for it.  After twenty years it 
> deserves some respect.
>
> Thanks for the good information.
>
> ---Carl
>
> PS--By the way, an ice cream freezer motor makes a really good winding 
> drive.

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