The wheels are made from 2 disks of 3/4 inch exterior
plywood, bias glued, drilled, then fitted with conduit bushings.
The axles are standard galvanized plumbing pipe. The wheels are mounted
with a washer on either side, a bolt and nut through the axle on the back
to hold the inside washer, and a key clip through a hole in the axle to
hold the outside washer. The wheels have a rim of stainless attached
with cement coated nails.
The skein tensioning winches are handmade. They
are constructed of 6 inch long pieces of 5 1/2 inch 1/4 inch wall steel
pipe, with a ring of 1/4 inch thick steel welded on 1 1/2 inch from one
end. 12 holes placed equally around the perimeter were drilled, then
tapped to accept 5/16 screws. These were silver soldered into place,
the ends cut off and the bottom side ground flat. A piece of 1 inch
black iron pipe was fitted into holes cut in the large pipe, and welded.
This provides the bar that the skeins fit around, and it also allows a
winding handle to be fitted into the winch for easier tensioning.
A plate of 1/8 4042 T-6 aluminum was fit to the side of the frame to provide
a running surface for the skeins. A standard grease fitting was added
to the steel ring to allow lubrication on the field.
A closeup of the winch detail
A length of 1 inch steel angle stock was needed as reinforcement across the area where the winches fit through. The amount of tension that this engine is capable of generating is quite substantial.