thanks for the address provided,in that 2.keyed shaft diagram,the effective key height reduces (h)as i told earlier the key hits the keyway of shaft ,thereby increasing the width at the edges(the contact area of key to shaft reduces),thus decreasing the torque transmitted by the key.
i know the...
sorry,i can't upload the figure,
imagine a key resting on the key way of shaft,then due to sudden forward & reversig the key makes the keyway(of shaft) larger,thus decreasing the area of contact of key to the shaft along the rectangular perimeter,
i need a analysis software to find at what...
i hav to find out why the key in output pulley fails due to sudden forward and reversing(in gearbox of lathe)i did some theoretical calculations in crushing & shear stress.please tel some solution regarding analysis of the key