Fitting Tolerance Guide

Fitting Tolerance Design This calculation form is the tool that makes it easier to compute interference and clearance when designing fittings, which may be relatively confusing. Interference : Difference between bearing's outside diameter and housing. Have a big influence on the manner of fixing bearings. Clearance : Difference between bearing's internal diameter and mating shaft diameter. Have a big influence on oscillating motion of bearings. Instruction 1. Enter values in metric and half-size character in the terms of calculation in the Input form. ( colored columns) 2. Click "RESULT", and the results will be shown at the output form ( colored columns) below.

Input Form Diameter(mm) Upper Limit Value(mm) Lower Limit Value(mm) Terms of Calculation Internal diameter of bearing Outside diameter of bearing Housing bore diameter Mating shaft diameter Click after entering the columns above. Additional guide for calculation · Interference = the shrinking amount of internal diameter · Use the average value of Interference for the calculation of clearance and bearing's internal diameter after injection · Use 0 for the shrinking amount of internal diameter (clearance fits) when the average Interference is below 0 Output Form Upper Limit Value(mm) Lower Limit Value(mm) Average Value(mm) Result Interference (between bearing and housing) Bearing internal diameter after fitting Clearance (Gap between bearing and shaft) Note 1 : The general designs of the interference for OILES bearings are transition fits and interference fits. Note 2 : Internal diameter of bearing shrinks in case of interference fits, which fixes bearing in the housing by interference Note 3 : Please set values of clearance not to be less than 0 example In fitting design of OILES Bearings, the values of interference and clearance vary depending on bearing materials, bearing structure, lubrication state, environment condition, and modes of operation.

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