The best orientation… wheels are at the extreme corners of a square base
keep the wheels close together for easier pivoting and turning
Now I'm confused... keep the wheels as close as possible or as close to the corners as possible? I have a feeling there is only one right answer for this. Personally I would think as close together would be best, but I really don't know.
Now I'm confused... keep the wheels as close as possible or as close to the corners as possible?
Thank you for the useful insight. I will post some photos of the robot once the frame is finished. Also, what would happen if you had 2 motors in the back that were higher torque but slower and 2 motors in the front that will lower torque but faster. Would the robot have better torque then if I just used 4 of the slower ones? (the wheel size would be the same)
I would assume you would burn the higher speed motors as they will try to drag the lower speed motors forward.
Think about it a bit: We are talking 4 wheels here. If you moved the wheels in the front back, and the ones in back forward, until they were near the center (but still spaced opposite each other), then yes, it would be easier to turn. Heck - if the wheels "merged", then you have the classic differential steered robot (add some casters on the front and back to balance).
I was thinking about putting one wheel/motor on each corner of the robot but you explained how that would screw up the turning.
Would that work? I think it would yet I have never seen a robot like that.
Is there a reason to keep the center from moving much?
you would just have some (maybe a lot) of wheel drag
I fail to see how that would be better than just a single pair of wheels in the center, and a caster on the front and back?
wheels mounted on shafts riding on bearings
A large, heavy frame will tip over if not properly balanced.
What I was referring to is, a heavy robot with tripod arrangement and only 1 caster can easily tip over.
That was my original plan, but two motors do not have enough torque to push the robot. It was cheeper to buy another two wheels/motors then to buy better ones. I assume that by adding two more motors/wheels I doubled my torque. Right?
QuoteWhat I was referring to is, a heavy robot with tripod arrangement and only 1 caster can easily tip over.I agree! That's why I thought that a caster on each end would prevent it form tipping. Would my idea for a 6 wheel robot work?