[ChrisH]

Saichel,

If I understand what Tytus is trying to say, then he is right. You need more support for that huge bushing that the power shaft goes through. That 1/8 or 1/16" sheet probably won't do the job. Of course you may have left that part out for clarity, but it isn't in the other images either, so I suspect that is not the case.

So run the bushing through a 2"x1" rectangular tube or C-chanel that runs across the robot and you're done. Actually you might get by with less, but the structure around the first two bevel gears needs to be stiffer. This is a local issue. The top plate is probably adequate for every where else, but the loads need to be transfered into the rest of the structure, so a cross bar is the easiest thing.

Overall, I think you have done a great job so far. What we are doing now is called a "design review". In the "real" world it's where a bunch of people who don't know anything about your design come in and try and tear it apart. Usually the reviewers are people who are knowledgable about that sort of system or are customers. Usually both types are present. While it can be painful, it can also catch some pretty big mistakes or misunderstandings before they get expensive.