As some of you may know I've been rebuilding a chevalier tool and cutter grinder. There's a jack shaft in the motorized workhead that was problematic...disassembly reveals the two diameters that mate with the roller bearings are small - one end is .003" and the other .007" . (after doing a ground up restoration, my opinion of this company's products is that the should have chosen harbor freight as their distributor , well at least the bearings are mid range quality)
Ok, question is, how to repair. I'd make a new shaft, but threads are metric and custom and my lathe isn't set up for them...I may still go that route but am interesting in trying a welding repair. any precautions to avoid warping the shaft? i've a mig welder; just lay down a around the shaft (figuring out how to rotate it while welding)? the bead is typically easy to machine?
I haven't done this before so am looking for the tips and hints on how to make it a success