Gearbox - Version 2

Design exercise. Designed to accommodate various PM motors in various configurations: CIM (large & small) & 775-type, and three sets of 20DP gears on 2.1" centers. Bearings shown are 0.5" hex ID. (VexPro offers a wide range of gears that meet this criteria: https://www.vexrobotics.com/vexpro/motion/vexpro-gears/1-2-hex-bore.html) 11/2/2018 - Updated to show fasteners and lengthened mounting tabs. Seems my "design exercise" is going to get built so a few changes needed to be made.