The Ball Bearing: In the Making, under Test and on Service

Abstract

Fits varying from 0.0013 in.clmrance to 0'0003 in.clearance are possible.According to the theory of probabilities (see '' Engineering," 21-3-39, page 361), not more tkan 5 per cent of the fits will range from 0.0013 in.clearance to 0'0011 in.clearance, and a further 5 per cent from 0'0003 in.clearance to 0'0005 in.clearance.These figures, however, do not quite represent the f a d s , because of the known tendency of the operator to produce shafts nearer the upper than the lower limit, and holes and boreis nearer the lower than the Data :- Results :-In such a case TF = 1125, TB; = '2250 lb.This, ,of oourse, i s a very extreme w e and could not, in the Another rarely occurring case is that in which the corner is then T = 0'8 x 3000 = 2400 lb., and the couple called into play w x 4.5 = 2 x 2400 ft.-lb.. where w is the load added to the outside nature ,of things, happen very often in the life of a car.rounded at sufficient speed to skid all the wheels.is and taken off the inside wheels, and whenoe w = 1066 lb. for front outside Lp = 500 + 355 = 855 lb.,, ,, inside Lp1 = 500-355 = 145 lb.,, rear outside La = 1000 + 711 = 1711 lb. ,,,, inside L R ~ = 1000 -711 = 289 Ib. consider i& mom common case, e.g., when the vehicle is travelling Then T=M&R po~ndals.at 10 d e s per hour and rounding a corner of, say, 30 ft. radius. 1 -3000 -m x ( x ) 30 88 'x -= 666 approximately.a d TR + T R ~ = 444 lb.TF + Tm = 222 lb.To find the load at eaoh hub we proceed as before, and equate EEATHCOTE.