Tom the photo shows the major parts of a cruiser bracket 3/4" axle with J.A.P. pedal lever taper, axle 3/16" key slot for pedal side sprocket & the keyed sprocket adapter. The axle shown I overshot the dimension on the opposite end. Rookie error made on the lathe by setting .001 on the scale, when I needed only half. So overshot by.001. Good news is I can still use this mistake by shortening it to a usable length and machining a new taper for use on one of my bikes.
Though these are availible in a couple of lengths from vendors I require shorter versions for each of these. Three axle pedals and three different lengths. I use the taper style rather than cutter because there are so many more pedal levers to select from. I don't typically need wide pedal levers for clearance, but pedal length is important. I find steel levers and cut them to length and reels, really short on low slung board track bikes, but I chain them up. Almost impossible to pedal very far, just for looks and legality.
The 3/4" bearings are press fit into the aluminum bearing holder (painted black) I turn down 2.25" rod to make these bearing housings.
Then I make the sprocket adapter from 2" aluminum rod. I can use my lathe and a 4 jaw chiuck to turn and drill these, not that hard, but easier with both lathe and mill.
I keep the 4 jaw mounted most of the time, but also use the three jaw some. Quick change out of chuck's with these little machines.
I've made several steel reduction style drives & both my Harley and Simplex use these. I use real Oil Lite brand, oil bronze bushings in these rather than roller bearings. They the steel housings are pretty heavy and I feature using aluminum will cut the weight in half. Oil brass bushing have been used in cycle and auto engines for decades multipled and those in my bikes have served well. I soak these bearings in light oil for a couple of days before installing and each assembly has a capped oil filler for an occassional few squirts. My Simplex bushing show no signs of wear after a few thousand miles of riding. I add oil before long rides, but normal riding around town maybe 3 times a year. Using these bushings allows me to use 2 25" aluminum or steel rod to mount the two sprockets. As each of my bikes has a different primary & secondary chain offset each housing uses a different offset to accomidate various motors or engines or perhaps with or without a Sprag clutch. I have a special sauce for these differing dimensions as well. Show you when I
complete one. No secrets among friends!
Rick C.