This instructable will show you how I built a flyer-driven, scotch-tension mechanism to fit on the base of my treadle sewing machine. It should be noted that in terms of ergonomics, this thing would be very awkward to try to spin raw fiber into yarn. However, it does a bang-up job of plying multiple strands of fine yarn unraveled from secondhand sweaters.
Step 1: Assemble Your Tools and Materials
-A functioning treadle machine cabinet! I sew a lot, so I have a couple of those.
-One super cheap ikea curtain rod, about 2 feet long. In the picture, the inner part is laid out next to the outer part, so it looks like 2 rods, but really, it is only one thing.
-4 super cheap plastic shelf brackets, also incidentally from ikea.
-a couple packs of bitty cup hooks
A board about as big as the top of the machine cabinet
A tube of contact cement
2 sheets of sturdy chipboard- I cut open the covers of a used 3 ring binder
the spring out of a ball point pen
an empty spool from some sewing thread
assorted screws & maybe nails
a ruler or tape measure
a teensy saw- I used a coping saw
a less teensy saw, in this case, a hacksaw
a drill or dremel tool with assorted drill bits up to 1/4". I had a drill and man I wish I'd had a dremel.
pencils & pens
hot glue gun
a packet of emery boards or some sandpaper
Things that are useful but not necessary: Clamps for holding stuff you're sawing, calipers, for measuring round things.
Step 2: Cut Some Circles
Set aside a pair of the 3" circles for later.
Glue the 2 1/2" circles together between the other pair of 3" circles to form a wheel with a groove in it. Tip: use contact cement for this part. It applies in a thinner, neater coat than hot glue, and has a longer working time.
Weight or clamp the wheel and wait until it's set.
This is where I wish I had a 1/2" hole cutting bit. But I don't, so instead, I used a regular 1/4" bit, drilled a hole through the center of the wheel, threaded in the blade from the coping saw, and cut out a hole the same diameter as the skinny part of the curtain rod.
This completes the drive wheel.
Step 3: Shape the Flyer Arms
Use sandpaper or an emery board to sand off all the burrs both outside the tube and inside. ( The emery boards were useful for sanding the insides of that little tube.)
Take one of the brackets and draw a circle the same size as the diameter of the flyer spindle around one of the screw holes nearest to the corner of the bracket. (I just traced around the tube.)
Repeat for the other bracket. Make sure the placement of the circles relative to the screw holes is the same.
Cut the brackets off exactly through the center of each marked circle.
Use the coping saw to cut out the remaining half circles on the brackets. Sand everything clean.
Step 4: Assembling the Flyer Head
Lay the 2 brackets together as shown, and glue a scrap of chip board across them to hold them in place. This is another good place to use contact cement.
When the brackets are set, insert the flyer spindle through the hole in the brackets, then through the hole in the drive wheel. Glue everything together. Leave about 1" of the spindle sticking out past the drive wheel. This end is the orifice end.
Screw cup hooks in along one arm of the flyer about every 1/2". Drilling tiny holes first really helps.
Drill a 1/4" hole in the flyer spindle right next to the place where brackets are attached. Sand off any burrs or sharp edges , or your string will get cut as you are using your machine.
Take some fine string and tightly wrap the flyer spindle. Glue the string in place. This is to reduce noise as the bobbin rattles around.
Step 5: Assemble the Flyer Holder
Place the board on the cabinet, and mark the places where the drive belt comes up through the cabinet. (I had to stick my head under the cabinet and scrooble around with a sharpie marker.)
Drill out the holes in the board. If you make elongated holes, you'll have extra room for error in your final assemblage.
Use the coping saw to cut a U shape out of one end of each of the remaining brackets. Sand smooth, but try not to remove too much material. The flyer spindle should fit into the U as closely as possible while still being able to turn freely.
Mount the brackets halfway between the 2 belt holes on the board, so that when the flyer is placed on the brackets, the drive belt runs over the drive wheel of the flyer.
Step 6: Make the Bobbin
Cut holes for the core in the centers of the remaining two 3" circles of chipboard. Glue the circles to either end of the core. One circle should be glued as close to the end as practical, the other circle should be about 3/4" from the end of the core.
Step 7: Add the Tension
Step 8: Celebrate!
Things to consider:
Beyond the fact that this thing would be really awkward to use for actual spinning rather than simply plying yarns together, it is tremendously noisy.
I mentioned that wrapping the flyer spindle will help reduce noise, but also glopping a bunch of hot glue into the bases of the holding brackets will help dampen vibrations. Finally, if you make the sockets for the flyer too big, this thing will sound like a herd of bison running across a tin roof. The solution is to glue some felt inside the U shaped sockets. Just don't use hot glue for this. I tried it and I found out that the friction of the flyer spinning will creat enough heat to re-melt the glue. Use contact cement, or better yet, cut your holes as exactly as possible.