Yes I would like to build a rideable one. I think the runtime should be at least 30 minutes for it to be any fun. And it should be able to run on any hard surface - I don't think I will ride it in any terrain except maybe grass.
Right on, we can make some more assumptions using these specs. You can get a battery based on calculation using motor draw and runtime. DO that after you decide what motors will work for this project.
I haven't tried to simulate the robot yet, but I have done some basic calculations with a total mass of 90kg and a wheel radius of 8cm. You can see them in the attached pdf.
Calcs look good although I'm not sure where you got a couple of your constants. 8cm radius is a rather small wheel?
I haven't done any drawings of the robot yet, but I will try to do it and then - with your help hopefully - calculate the specs of the robot
I won't do it this week, as I'm very bussy at school, but next week I will try to make a drawing and then do some calculations.
Whenever you're able. Honestly the easiest way to go about this is to make a simulaid out of wood and add weights to it. There's no substitution for real world experimentation.
I think that 8inch diameter wheels are a bit to small, I was thinking about more like 15inch - maybe I will just use wheel tires. Or what do you think?
A smaller wheel will make it easier for the motors to compensate while balancing. The small radius produces more torque at the wheel and a smaller circumference requires less RPM to travel during adjustments. On-road applications don't require high ground clearance either.
However, if you expect to travel over road obstacles such as curbs and small animals, a wheel larger than 8" is necessary. A larger wheel will produce higher speeds.
Our mission is to find the wheel size and motor that will handle balancing and an appropriate speed.
PM me when you're not busy with school and we can work out the details. I'm interested in building a balance bot too - now is as good a time as any.
Ted