18-08-2021, 11:42 PM
(This post was last modified: 18-08-2021, 11:47 PM by Bob Culver.)
Random observations, many as above.
Prudent to crack test. All radii should be generous and not tightened. The original crank tolerance seems to have been +0 to + .00025. Some skill necessary to measure accurately to such limits. Bearings are very slightly u.s, less than .001. Neverthelss the range in tolerances can result in interferece or none on a slightly us shaft.. Loose rear main is common. Processes involving high temp are n.b.g. and lead to failure. Neverthelss common. Any machining must preserve radius. I dont know about nickel but hard chrome plating is very conducive to fatigue. There is not much room for a sleeve. If adept at precision lathe work seems scope to sleeve and to bore housing for a larger (cheaper) standard metric bearing.
Prudent to crack test. All radii should be generous and not tightened. The original crank tolerance seems to have been +0 to + .00025. Some skill necessary to measure accurately to such limits. Bearings are very slightly u.s, less than .001. Neverthelss the range in tolerances can result in interferece or none on a slightly us shaft.. Loose rear main is common. Processes involving high temp are n.b.g. and lead to failure. Neverthelss common. Any machining must preserve radius. I dont know about nickel but hard chrome plating is very conducive to fatigue. There is not much room for a sleeve. If adept at precision lathe work seems scope to sleeve and to bore housing for a larger (cheaper) standard metric bearing.