comradegerry
100 W
Mounted the chainwheel and used 1 washer behind the WI Freewheel to just move the inner Gates cog away from the frame, no rub any more. Elongated the holes in the torque plate to allow belt tension, not quite as much as I would have preferred. Gates recomend a tension that 5-10lb of weight at the mid point on the belt will create 1/2" of deflection, so that is what I aimed for.I used an Alan key wedged between the frame and the flat of the axle as a guage to tension the belt. 6mm seemed just too much and 5mm was not quite enough. I now need to remake the torque plate with the idea of the sliding tension arrangement, 12mm of adjustment should be all that is required and should account for any growth in the belt over time. I will probably make a matched pair to strenghen things up and for asthetics. Moving the wheel back in the drop outs 5.5mm seems to give the right belt tension, I think, maybe 6 or 6.5 maybe the magic number but I do not have that ammount of adjustment yet.
The only problem I foresee with this setup is changing a rear tyre will be a PITA as it will need the chain from the motor disconecting to allow the removal of the crank ring, before the belt can be removed. I just need to add a front brake, connect the Shimano gear cable, stick the pedals on and see what happens with some proper loading on the drive train. I have noticed a significant a mount of wobble in the freewheel at no load, spread over a wide chain ring this looks like 1/4" of play, which may be too much to live with since all the tolerances are quite tight. The Greyborg will definately be a moving bicycle this week.
View attachment 2
The only problem I foresee with this setup is changing a rear tyre will be a PITA as it will need the chain from the motor disconecting to allow the removal of the crank ring, before the belt can be removed. I just need to add a front brake, connect the Shimano gear cable, stick the pedals on and see what happens with some proper loading on the drive train. I have noticed a significant a mount of wobble in the freewheel at no load, spread over a wide chain ring this looks like 1/4" of play, which may be too much to live with since all the tolerances are quite tight. The Greyborg will definately be a moving bicycle this week.
View attachment 2