well i have pulled down an RB26 for rebuild and found a knackered crankshaft........new cranks are priced quite resonable so i bought 2 new cranks one for the engine and one for myself....heres the mods that i did on one of them today.......first we set up one end in a 4 jaw chuck,and we put a bearing on the other end and clamp that in a steady rest .....we check its true by placing a dial indicator on the main journal surface and spin the crank in the late....we then adjust it until its true..... then we start machining our first crankweb counterweight,we take it from as close to the rod end journal as we can get it right to the main journal at around a 50 degree angle(i cant remember exactly what the angle was)the working back toward the front end of the crank(you will notice only every second web is getting done,this is because every first web needs to be cut back to the opposite end of the crank,we do this by reversing the crank in the lathe)i managed to get all of the
second webs done today....i will have the first webs done tomorrow then start balancing it...heres the pics