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        Candle wax "bobbins"

#1 epilot Jan 06, 2004 12:49 PM

Candle wax "bobbins"
 
1 Attachment(s)
Here is a picture of a candle I just turned in my lathe. It is for winding coils with a 5mm center hole. After the coil is wound, add a drop of CA to set the coil, then put in boiling water to melt the wax. You don't need a lathe, just get some candles that are thin enough to chuck in a drill.

Michael

#2 j8m8l Jan 06, 2004 01:13 PM

Awesome Michael

Think I may try that for some coils I need to wind soon.

Josh

#3 Jgardner Jan 06, 2004 01:18 PM

Bonding
 
Will the wax then bond the coil? That would be slick if it did not weigh too much.

#4 epilot Jan 06, 2004 01:27 PM

You bond the coil with CA or another glue of your choice. Epoxy works well. The wax is melted away.

Michael

#5 epilot Jan 06, 2004 02:31 PM

The result
 
1 Attachment(s)
Here is the result - perfect little coil. I just emerged it in boiling water and all the wax disappeared as if by magic ;)

500 turns 0.05mm wire, 5mm ID, 85ohms, 0.3grams :)

All credit goes to Jeppe who showed me how to do it.

IMHO it is THE easiest way to make a bobbin-less coil.

Michael

#6 j8m8l Jan 06, 2004 02:35 PM

Beautiful Michael.

What glue did you use for that one?

Josh

#7 Dave Wulff Jan 06, 2004 02:39 PM

Michael,

Very slick..another "whish I had thought of that":D

Dave

#8 epilot Jan 06, 2004 02:46 PM

Josh, I used a drop of CA.

Dave, I'm hoping this is the way to go with the really thin wire.

Christmas candles should be on sale now, no? :D

Michael

#9 j8m8l Jan 06, 2004 03:04 PM

I think that I am gonna have to save up for a mini lathe/mill combo.

There is so much I could do !

Josh

#10 billystiltner Jan 06, 2004 04:03 PM

Michael

Nice.
When I unwind the superthin wire I do it by hand and the bobbin I wind onto has a loose fit on a dowel. I twist the dowel so if the wire gets caught up or tangled the bobbin slips on the dowel.
You might be able to make something like that with a drill , the wire is really easy to break. The wax is a great idea to wind the
coils on. No fuss with keeping the flanges tight or pulling the straw from the bit. Allthough the most recent one I wound was pretty easy. The wax seems easier.

Billy

#11 Trizza Jan 06, 2004 08:40 PM

Beautiful! Now that I have a lathe I'll have to try this - winding coils used to drive me insane because even if I managed a full coil I'd destroy it trying to remove it from the form. Maybe I'll build a winder too now that I have piles of sewing machine motors to use. Cheers!

#12 Trizza Jan 06, 2004 08:44 PM

PS - how was the wax to turn? Looks like it made a good finish.

#13 rustycage Jan 06, 2004 09:08 PM

How about those cheap thin birthday candles with paper/cardboard ends to make a bobbin or would that be too small for a coil? You could still melt the wax away and the paper would just fall off.

#14 dburley Jan 06, 2004 11:28 PM

Hmmm -- Lost wax coils !!

#15 Graham Stabler Jan 07, 2004 05:38 AM

Come on epilot you can do better than this, you should have cast the wax mould with the magnet embedded, that way you can have coils with a spherical interior!


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