Posted by Desoto61 [138.162.0.45] on Friday, February 28, 2014 at 13:50:18 :
In Reply to: OK, Here is whatI did... posted by CSCameron [174.26.45.190] on Friday, February 28, 2014 at 13:29:05 :
Remember that friction and braking heat will cause things to expand. Backing off the nut provides that expansion room so the bearings don't get loaded excessively.
As other's said below the 100 ft/lbs initial set is to make sure the bearings are seated before adding the slack to again provide just the right amout of expansion space.
Remember you are setting things cold, and they won't stay that way, if you don't account for that in the engineering design the results won't be good.
As for the torque change just remember that metal is essentially incompressable, so once the nut is touching solid metal and all the slack is gone, all additional torque is just going to try to compress the metal, so even with a fine thread there's not going to be much deflection in the system.