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Vintage threads from the first ten years

Tensioners

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9/7/2002 11:25 PM
R.G.	Tensioners So - how does one make a good tensioner for their drill press? R.G.

9/8/2002 12:04 AM
Tony@Mastertone	RG Thanks for that info on Q ratio... that was a great read.. Anyway if you read the stuff at the link below it covers a couple of ways you can get started with building a tensioner.. Cheers Tone http://www.firebottle.org/cgi-bin/fireforum/fireBB.cgi?cfg=&forum=pmgd&thread=100543-000000.msg

9/8/2002 2:41 PM

OK, I understand the spring-washers-felt one.

I was wondering about the variation in tension with the rotation of the bobbin. Seems like there's a big variation in tension between the point of rotation where the wire is laying on the long side of the coil, and when the coil end rotates in and begins pulling wire faster. Wire velocity goes to almost zero just as the coil long dimension aligns with the incoming wire, then speeds up as the coil rotates to 90 degrees off the incoming wire direction. That has to vary the tension.

I guess you're still setting the maximum tension per turn, and as long as that is less than breaking, it all works.

I was thinking of something like a coil follower that rocked back and forth to try to keep tension constant.

Thinking about it, the wire velocity going into the coil has to be close to a full-wave rectified sinusoid on top of an average level. If you could do a programmed-motion rocker to compensate for the difference between the average level and the FWR difference, you could keep tension truly constant.

Probably needless complexity...

R.G.

9/8/2002 4:34 AM
WolfeMacleod	My tensioner is a basic vice, padded with felt. The wire runs through a hole in the tabletop, and the wire sits underneath. WOlfe

9/8/2002 9:06 AM

I took the tensioner and the motor of a sewing machine, which my dear woman was going to throw away. Stopped her just in time.
It´s a knob with numbers on it , like a guitar volume knob , and two metalplates and a spring too.
I put felts between metalplates , thought the metalplates only was a bit hard on the insulation.
Works just fine!
I've got a winder built from Jason's Winding Book ( great book , buy it ) and there's a long tensioning-arm which the tensioner is mounted on.

Tony , interesting figures about wire-tensioning.
Is there any cheap home-made way to measure wire tensioning to figures ?
Those wire-tensioning measurements devices or are a bit expensive.
Do you understand my english?
I'm from Sweden , Scandinavia y'know where "all the girls are blonde and pretty".
If you don't understand my english let me know.

9/8/2002 9:39 AM
Tony@Mastertone	Gunno I understand you 100%.... Now you want to buy poler bears for what reason.. No just kidding, yes your english is fine. As far as a measuring tension on magnet wire ... well I am working on that now.. I've got a few idea's.. Cheers Tone

9/8/2002 2:44 PM

quote:
"I took the tensioner and the motor of a sewing machine... It´s a knob with numbers on it , like a guitar volume knob , and two metalplates and a spring too...I put felts between metalplates , thought the metalplates only was a bit hard on the insulation."

Neat! It's the same problem, and a good solution.

quote:
"I've got a winder built from Jason's Winding Book ( great book , buy it ) and there's a long tensioning-arm which the tensioner is mounted on."

I used to wind transformers on a manual winder we had in our power supplies lab, so I'm pretty familiar with winders. It had a tensioning arm apparatus on it too. Fishing rod looking thing.

I suspect I could draw up something to do a winder.

R.G.

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