This project has evolved some , the basic rundown is I'm modding two Omnibots , one a regular the other a larger 2000 model. I will have two ezb kits , rad base idea was thrown out because of so much noise but could go back on the table if the omnibot drivetrain is too weak to pull it.
By jstarne1
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Now that's a goody box!

Ok I cut the brass pinions off the shaft which was very easy and tapped on the Delrin pinion from Troy. Next I must cut out the original plastic mounts and adhere two motors together.Ok I cleaned the sides of the motor cases off and cut off the plastic lip so they can be epoxies together. They are.perfect, they are off about a mm but they still line up with the first input spar gear.
I cut away one mount which was simply too short. Here you can see how two motors would mesh up to the input spargear.
Ok I checked out the meshing on the gears, they look to fit together well. I did a HD test video, sorry about the noise the camera is like 12 inches and sometimes closer to the gearbox which has no grease in it or a cover.
Test video!
https://www.youtube.com/watch?v=Q5w6XiU_3Ho&feature=plcp