A pair of meshing spur gears with pressure angles (
\Phi
) of 20
\deg
and a module (m) of 2. The pinion has 20 teeth (
T_(2)
) and the gear has 40 teeth (
T_(3)
). Determine center distance (C) of the two gears. When the center distance is accidentally increased by 0.3 mm, determine the new pressure angle.