The bearing tolerance can be considered according ISO 492 (P0…P2). If selecting ‘Not considered’ the interference fit is not considered for operating clearance, in this case only temperature will affect the operating clearance, but centrifugal forces are not considered.
If selecting ‘Nominal dimensions’, the tolerances of the bearing are considered zero. Then the interference fit can be defined with the inputs for the shaft only.
Selecting ‘User input’ allows the definition of custom tolerances.
If no tolerance range should be considered, the selection 'Define interference' is useful. Then the interference between shaft/inner ring and between housing/outer ring can be defined directly. No reduction because of surface roughness is considered in this case.