03-08-2021, 12:14 AM
Some time ago someone publshed here a 1929 crank blueprint which gave journal tolerances as front -.00025 and rear + .00025
Used with the bearing tolerance Tony quotes would help explain why so many rear mains worked loose. The tolerances i quoted also appear in Machinery Handbook 1996. Neither that book or NSK Manual lists specifically for imperial and as NSK make both presumably the same tplerance applies to all.
I dunno how Phoenix are finished but if more than +.00025 any C3 clearances would be reduced
C3 bearings are preferred where a lot of deflection occurs ie 3/4 and semi floating rear wheel bearings. (Contrary to preloading a/c where deflection occurs!)
NSK recommend interference does not exceed 7/10000 of shaft dia.
Used with the bearing tolerance Tony quotes would help explain why so many rear mains worked loose. The tolerances i quoted also appear in Machinery Handbook 1996. Neither that book or NSK Manual lists specifically for imperial and as NSK make both presumably the same tplerance applies to all.
I dunno how Phoenix are finished but if more than +.00025 any C3 clearances would be reduced
C3 bearings are preferred where a lot of deflection occurs ie 3/4 and semi floating rear wheel bearings. (Contrary to preloading a/c where deflection occurs!)
NSK recommend interference does not exceed 7/10000 of shaft dia.