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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
What would be the best (and preferrably cheap) material and glue to make bobbins for a large mains xfmr? Ideally it should be able to stand ~150C heat without deformation, and of course the material must be a good insulator.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Polypropylene would be ideal here, it melts at roughly 160C and has very good dielectric strength. I know the raw materials price is somewhere around a US dollar a kilo, so sheets(?) shouldn't be that expensive.
Infact I think a lot of bobbins are made of PP juding by their properties.
I doubt it will be a problem, but I'm not sure how well PP glues...
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
I read about Finn creating a pole piglet he called 'pork chop' made his bobbins using bits of circuit board with the copper cleaned off for the primary bobbins and what looks like a simple PET covered tube for the secondary bobbins. Take a look, here.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I think mine were cambric paper. It's expensive stuff and kinda hard to find. You can find cambric tape in some electrical supply places, but it's specialized and not much demand unless you're winding transformers. Cambric is a treated paper, basically like fiberglass cloth treated with a flexible resin. If you need budget stuff you could buy a small can of resin and fiberglass cloth for tub repair, make a wooden mould, grease it up with vasaline and cast your bobbin that way. It'll require some trimming with a Dremmel, but that's essentially what I've done for casting. Or you could varnish Cambric or Fish paper, maybe even heavy card stock from a paper place.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Old transformer bobbins were made of phenolic (trade names like Tufnol, Paxolin, etc) and paper, all vacuum impregnated with varnish. Newer ones are made of some fancy plastic like glass-filled nylon. They work great, but they don't smell half as good.
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Making transformer bobbins
