I have a question for you more experienced machinist types. I have a bicycle hub fitted with sealed cartridge ball bearings - R8-2rs - so 1.125 nominal OD. This is mounted to a 20 inch rim.
I need to remove one bearing and press in a hub/flange for a disc brake - and possibly in future a drive pulley. The removed bearing will be installed in the added hub. I am using CRS for the new part. What kind of interference fit do I need? How much bigger does my shaft have to be than the hole? Am I best to do a dry fit or dhould I be using a permanent shaft locker like a green LocTite?
The stub of the hub/flange going into the hole in the hub is 8 mm (5/16 inches) - the sise of the R8 outer bearing race - and the wheel will be run on a threaded axle with a spacer between the bearings, with the wheel hub and the flange/hubconstrained by the axle.
For anyone interested this is to add bicycle disc brakes to my reproduction 1919 Briggs and Stratton Flyer. The possible drive pulley application would be a 1925 Auto Red Bug.
I am machining the parts on my Myford Super 7 lathe and will be putting together a rotary table using my myford chuck on my benchtop drill press to drill the flange for the 6 on 44 mm bolt pattern for the disc rotor I have just completed my front steering axles and am working on the "facsimile" motorwheel using a 6:1 reduction 2.5hp (8 cubic inch) Briggs engine. Looking for a 9 cubic inch to take it's place and also considering making an adjustable timing gear camshaft to advance the valve timing for more bottom end torque (since I do NOT need the full3600RPM!!) This would involve machining the gear off one camshaft, and machining the camshaft out of another gear then fitting the machined recess in the back of the gear over the machined flange on the camshaft and securing with 2 bolts through elongated holes. to enable splitting the difference between 2 teeth - 44 teath on the cam gear is just over 8 camshaft degrees or 16.4 crankshaft degrees per tooth and I require 3 to 7 crankshaft degrees of advance (I estimate) - so roughly 1/4 to 1/2 a tooth - - -