> The other thing I want to ask about is take up tension... I found a strange
> phenomenon tonight - if I had the largest whorl on (9:1), the cotton band
> could be very loose (easily "indented" by pushing on it) and still have good
> take up. With the smallest whorl (19.5:1), I could tighten it till you could
> hear the string "plink" when you plucked it, and it had no take up whatsoever.
In a double-drive system, take-up is determined by the difference in
diameter between the whorl on the bobbin and the whorl on the fly. The
greater the difference between them, the greater the take-up will naturally
be. You can then tweak it by tightening or loosening the drive band (which
adjusts the amount of slippage). But if the whorls are very close in
diameter you won't get take-up, no matter how tight you make the driveband.
My former wheel, a Reeves 30" production model, had a hard time with its
high-speed whorl in double-drive mode for exactly this reason. I finally
learned to switch it to scotch tension for high-speed spinning and then the
take-up was fine. My Alden Amos wheel has special bobbins, flyer, and whorls
for high-speed spinning and it works fabulously in double-drive mode.
I don't know the difference between the Schacht high-speed bobbins and the
regular ones, but if they've tweaked the size of the whorl on the top of the
bobbin, it certainly couldn't hurt to try one out at a slightly lower ratio
and see if it helps.
Elaine
--
Elaine Benfatto, Cambridge MA
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http://www.urbanspinner.com/
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