Let's Make Robots!

CascaBots RoundBot Chassis for Tamiya 70097 twin motor gearbox

I've taken a look at what's out there for the Tamiya 70097 gearbox, and decided to design this chassis :-)

 Major design features include a twin deck and parallel I beam construction for rigidity; all moving parts,including the turret mast are inside the diameter of the chassis - nothing protrudes (Frits's request); the internal beams fully support the output shafts from the 70097 - a sorely lacking feature on current chassis... and my personal favorite, an engraved protractor on the top deck. Makes it easy to see and adjust code for turning radius.

Chassis uses a Tamiya 70145 wheel set.







Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Very nice, that looks fancy. I like that engraved protractor. I'll definitely be ordering something from you at some point.


Thanks Dan. I really like the protractor as well - it really serves a nice purpose that I have personally needed and I suspect other's have as well.

Slick! I want one!

This is tuned to the gighest gearing on the motors, right?

Frits, its setup to use the 203:1 gearing in this photo, but it can also use the 58:1 gearing by just changing the gear ratio on your gearbox and using the rear set of mounting points on the chassis.

Will this fit the design you wanted for nothing protruding from the diameter of the chassis? :-)

You shall have one!


The plexi you are using...

What is it? Plexi, lexan acrilic? To the point, can it be drilled or is it the kind of stuff that cracks and explodes if a drill bit even looks at it funny? (I have had some bad experiences in the past)

Also, you mentioned doing some custom work, is it a huge deal to streach this to an oval or elipse to allow 2 Tamiya gearboxes and 4 wheels? -I might want to talk seriously with you.

Thanks in advance for your help and time.


Chris, it's plexi. You gotta go slow with a bit or it will crack - the easiest way for you to make a new hole would be to pierce the plexi with an old iron tip on your soldering iron. No worries about cracking then.

 Not a big deal at all to cut you something custom. If it's based on a current design, I should be able to modify to suit your needs.

Thanks Casca,

Yup, I sure do know about the plexi... I used to do a lot of upper-end car stereo work and have drilled, heated and bent, sanded and polished more plexi then I care to think about. :) Actually, my little trick has been to sandwich the plexiglass between two pieces of thin plywood with a couple good clamps and then drill. At any rate, thanks for the responce, I need to get some thoughts in order and I will be getting in touch with you in the near future. --Great looking site by the way, good stuff.


Thanx, just a simple site with room to grow.

 I did some preliminary designing, and it's fairly straight forward to put two 70097's in a twin stacked simi-elipsodial deck -


this got me to thinking - might be fun to take two of the RoundBot chassis and link them together via an articulated servo joint...



Holy Cow if you made this I would Buy one now!
It's not a problem, just let me know if you'd like something similar and I can cut it for you.