The shaft shown below is to be mounted with identical Timken Medium 300K series ball bearings at A and D. The bearing inner rings rotate with the shaft and the load is stationary (does not rotate). (a) Referring to the Timken catalog, what is the appropriate bearing number? Shaft/Bearing Bore Housing Basic Size 30 mm 30 mm A B C (b) What is the fundamental deviation value letter and value for bearing bore? What are the limit dimensions for the bearing bore? What is the approximate (i.e., the closest) ISO tolerance grade for the bearing bore? (c) Timken recommends that a k5 tolerance class for the shaft be used in an application where the bearing inner ring rotates and the load is stationary (our case). What are the resulting limit dimensions for the shaft diameter at the bearing locations? (d) What type of fit (clearance, transition, interference) do we have between the shaft and bearing bore? What is the allowance for this fit? Bearing OD/Housing Diameter (e) What is the fundamental deviation letter and value for bearing OD? What are the limit dimensions for the bearing OD? What is the ISO tolerance grade for the bearing OD? What is are the limit dimensions for the outer diameter of the bearing? What is the ISO tolerance grade for the bearing OD? (f) Timken recommends that an H6 tolerance class for the housing diameter be used in an application where the bearing inner ring rotates and the load is stationary (our case). What are the resulting limit dimensions for the housing diameter? (g) What type of fit (clearance, transition, interference) do we have between the bearing outer ring and housing? What is the complete ISO fit specification. What is the allowance for this fit? Problem 3 Answers (a) Bearing No. (b) Bore Fundamental Deviation Letter Bore Fundamental Deviation Value (mm) Bore Upper Limit for Diameter (mm) Bore Lower Limit for Diameter (mm) Bore Approximate IT Grade (c) Shaft Upper Limit for Diameter (mm) Shaft Lower Limit for Diameter (mm) (d) Inner Ring Fit Type Inner Ring Fit Allowance (mm) (e) Outer Ring Fundamental Deviation Letter Outer Ring Fund. Deviation Value (mm) Outer Ring Upper Limit for Diameter (mm) Outer Ring Lower Limit for Diameter (mm) Outer Ring Diameter IT Grade (f) Housing Upper Limit for Diameter (mm) Housing Lower Limit for Diameter (mm) (g) Outer Ring Fit Type Outer Ring Fit Allowance (mm)