Helical Gear Box

This is a test design for a 1:1 90 degree gear box with helical gears. The gears are designed to fit a 1/8" shaft. The gear box is 8.5mm wide over the shaft openings, and the whole thing will be about 15.75mm across the gear faces. The shaft center lines are 7.5mm apart. The gears themselves are 4mm wide