In an epicyclic gear train of the sun and planet type shown in Fig. 15.33, the pitch circle diameter of the annular wheel A is to be nearly equal to 216 mm, and the module is 4 mm. When the annular wheel is stationary, the spider which carries three planet gears P of equal size, has to make one revolution for every five revolutions of the driving spindle carrying S gear. Determine the number of teeth on all the wheels and also the exact pitch circle diameter of A. P S A Fig.15.33 Sun and planet gear train