This is the steel collar that fits over the shaft at the end of the top or bottom bevel, its purpose being to contain the Oldham Coupling that fits into the tang at the end of the bevel gear shaft.
This is a 'Standard Fit' collar. Price is each
Ideally the collar should be a 'nip' fit over the shaft, where it is lightly tapped on (I use an alloy drift with hammer, with the bevel gear bottom face sitting on an alloy/wood block). For the lower bevel gear this also seems to serve a second function, in that it stops the lower bevel gear dropping through gravity onto the crankshaft bevel gear.
Not sure if this was Norton's original intention (or actually if it makes any significant difference!), but for this reason, I always try and make the collar a nip fit on the shaft. Because there seems to have been a considerable variation of SOHC Bevel Gear shaft diameter variation (i have seen up to 1.5 thou variation on the quite considerable number of gears I have measured - even unworn shafts) we have made these collars to be a good fit over the bevel gears we manufacture - which we believe to be the most correct diameter - i.e. a nominal 0.7485" - 0.749".
If the collar is not an ideal fit over your own gear:- if too tight - you can carefully 'flapwheel' the inside diameter of the collar, until it taps on, or, if too lose - use a small quantity of 'Bearing Fit' to retain the collar. Note: we also sell a one thou undersize collar (Item 0470), so if you have an original bevel gear and you think the shaft diameter is less than above, then probably best to go for item 0470 (or buy one of each . . . and you can have a choice!)
