Well here are pics of the build refined. At a glance they're little
different than the first set. #1 used a 5/8" bolt for a shaft, the
shank of which was actually 9/16" thus loose fitting in the bearings.
For this build I used a 10" x 3/4" bolt laboriously filed it down to a
tolerance of .7mm at the clutch end to allow for heat expansion.
and .3mm at the pulley end. So now no wobble in the 5/8" bearings.
the 10" bolt was the only one I could find with a long enough shank.
The Staton friction channel mounting arrangement is far more
exact though I did shave back the drum shroud as it kept the drum
reaching the last 1/16" of the clutch shoes.
The belt tensioner is slotted & adjustable. you'll note a second belt
zip tied to the seat stay. These 2 belts are interchangeable &
represent 2 ratios. The 68" 3L belt is 17.7 to one; the 71" 3V
is 20.6 to 1. They can be changed without removing the wheel.
The pic of the under side shows bearing,spacer, shaft collar--
collar ,spacer, bearing. this keeps the collars from binding
against the bearings. the notch in the shaft is for a wrench to
grip when changing the pulley or clutch drum.
The crash guard telescopes for maintenance like a trombone
and steadies vibration; the main mount is backed with thick
rubber, and there are also plastic washers where the struts mount
that serve to dampen vibration. It's not noticeable even at
22 mph. That's as fast as I've gone yet at scarcely more than
half throttle.
different than the first set. #1 used a 5/8" bolt for a shaft, the
shank of which was actually 9/16" thus loose fitting in the bearings.
For this build I used a 10" x 3/4" bolt laboriously filed it down to a
tolerance of .7mm at the clutch end to allow for heat expansion.
and .3mm at the pulley end. So now no wobble in the 5/8" bearings.
the 10" bolt was the only one I could find with a long enough shank.
The Staton friction channel mounting arrangement is far more
exact though I did shave back the drum shroud as it kept the drum
reaching the last 1/16" of the clutch shoes.
The belt tensioner is slotted & adjustable. you'll note a second belt
zip tied to the seat stay. These 2 belts are interchangeable &
represent 2 ratios. The 68" 3L belt is 17.7 to one; the 71" 3V
is 20.6 to 1. They can be changed without removing the wheel.
The pic of the under side shows bearing,spacer, shaft collar--
collar ,spacer, bearing. this keeps the collars from binding
against the bearings. the notch in the shaft is for a wrench to
grip when changing the pulley or clutch drum.
The crash guard telescopes for maintenance like a trombone
and steadies vibration; the main mount is backed with thick
rubber, and there are also plastic washers where the struts mount
that serve to dampen vibration. It's not noticeable even at
22 mph. That's as fast as I've gone yet at scarcely more than
half throttle.
