[Tom Line]

One thing to always think about when drawing is how your parts are actually going to be put together. Are you welding your tubes together? If so, consider that there will be a weld bead on those tubes unless you want to take the time to grind them down flat (which can also reduce their strength). You have your super-shifter bracket sitting directly on top of one of those weld points.

Next, why do you have the super-shifters in that orientation? Why not turn them so that the sprocket is higher off the frame to offer more accessability in case you want to make changes or need to do a hasty repair?

How are you going to tension the chains? Specifically the change from the center wheel to the super-shifter. I would suggest putting a push/pull block there or at least a jack-bolt to use to move the supershifter if you plan on slotting the connecting plate.

Why does your mounting bracket on the supershifter go so high that it you have your drive shaft going through it? This will require you to pull the sprocket if you ever need to remove the supershifter. Pulling sprockets with keys can be VERY hard to do if they've been on for any length of time.

Is there a particular reason you've put the supershifters so far back on the frame? By putting them near the middle wheel you can save weight on that chain run.

I would also suggest cut-outs that allow you to reach in to work on your middle bearing blocks from under the robot. From experience, the guys of FRC robots can get very congested and any easy-access to things like drive-trains will only be praised when you get into a tight spot.

Is there a particular reason for that structural beam just forward of the "back" of the bot? You don't really need it just to support the supershifters.

The absolute key to good cad is to understand exactly how your design will be made. If you don't, you'll likely get yourself into a situation where what you've drawn is impossible or improbable to manufacture.

Very nice job for a first try!