fix rack traverse_pitch

Author: looooo

freecad/gears/features.py

@@ -561,9 +561,8 @@ def generate_gear_shape(self, obj):
         if "simplified" in obj.PropertiesList:
             obj.rack.simplified = obj.simplified
         obj.rack._update()
-
-        obj.transverse_pitch = "{} mm".format(obj.module.Value * np.pi)
-        m = obj.module.Value
+        m, m_n, pitch, pressure_angle_t = obj.rack.compute_properties()
+        obj.transverse_pitch = "{} mm".format(pitch)
         t = obj.thickness.Value
         c = obj.clearance
         h = obj.head