Wednesday, January 04, 2012

First new tools of 2012

I started off the year by making some new bobbins:

The one in the flier is for singles in the range of 11,000 ypp (20s) and the one on top is for finer singles (20,000 + ypp, 40s; these numbers have changed as I use different fibers, different fiber prep, and made better measurements).  These bobbins are a little lighter and the wider whorls allowing slippage for spinning finer yarns than the DRS would suggest.  On the other hand, that slippage slows everything down, particularly as speed increases and the aerodynamics of the flier start to consume significant power.  I do need a more aerodynamic flier.  (The oil finish is drying on one right now!)

They look small, but they will both hold a little over an ounce of  singles.  An ounce of 20s is 700 yards.  An ounce of 40s is 1,400 yards. Thus, I have no problem winding off full hanks of 560 yards from these bobbins.

The physical flier ratio is 22:1.

They took about half a day to make.  I bored 5/8" maple dowel with a 9/16" hole on their axis by holding them in the wood lathe.  I enlarged the axis boring at each end by 3/8" x 7/16" to hold the brass bushing bearings.  For the ends, I cut a 2" square piece of 3/4" maple stock, trimed the corners to ease the start of turning, and on the drill press, bored a 5/8" hole through the center. On the band saw, I cut the ends apart, one ~ 1/4" thick and the other ~1/2" thick.  I glued the ends on the core.  A couple of hours later, on the wool lathe, I rough turned the thin end, and then the thick end.  Then I finish turned the thin end, making sure it cleared the flier. Then I finish turned the whorl using the scrapers that I made last year and posted below.
The bushing bearings were inserted, and held in place with a dab of silicon adhesive.  A bit of sanding, some Danish oil, and they got left on the rack to dry while I made dinner for my wife.

Normally, I would let the core/ends-blank glue-up dry overnight, but this time, I got away with only ~ 2 hour set time.  

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