At the end, the project exceeds the weight limit. So I return to my previous version. Im going to use the Pololu 35:1 motor, so I need to re-elect wheels again.
Last time, you said that using RB-Ban-155 hub with 2 RB-Ban-107 wheels are too much for this motor.
Using the Drive Motor Sizing Tool I’ve seen that with two of these motors, I can move 1kg without problem.
If i use 2 of these motor at max current, it would be ~10A. What do you think about using a 3,3Ah, 40C battery?
Only 15 minutes of autonomy would be enought.
Ohhh, 4-7/8" its 4’875" !! I never saw something similar…
I can change the hub, its not a problem. But, do you think is to much wheel for this motor?
It should go at 1m/s and good acceleration carrying 0.7kg, also 0.3-0.4m/s with 1.4kg
The motor’s shaft is 3mm in diameter, and Pololu makes various diameters of wheels which will press-fit right onto the shaft (see cross-selling). If you want to use a BaneBots wheel, you would need one like RB-Ban-151, which has a 3mm bore and 1/2" hex mounting (0.4" wide). This would mate with RB-Ban-91 which has a 0.5" hex bore and is 0.4" wide.
That hub does not connect to the sumo tire. Also, that motor would likely fit entirely inside that sumo tire and likely won’t be powerful enough for your needs.
Yes, but you would need to glue the shaft in place since the bore is 3mm and there is no set screw mount.
The Drive Motor Sizing Tool is the best way to tell. Inputting 1.5Kg-cm, 2 drive wheels, a radius of 1.4375", a speed of 4’ per second, a maximum angle of 10 degrees etc. The torque required is 15 oz-in. The motor you chose has a stall of 15oz-in and would be far from powerful enough. Even if you drop the weight to 0.75Kg, the torque is 7.5oz-in, which is half the motor’s stall. You should be operating at ~1/4 stall.
The choice is yours.
4- 7/8" means 4 inches plus 7/8 inch = 4.875 inches = 12.3825cm
Not quite. You link to a series 40 (0.4" wide) hub, but the wheel is 0.8" wide. You’d need RB-Ban-155 (series 40 hub, 3mm bore, 2-wide = 0.8" wide) and RB-Ban-104 (0.8" wide, 0.5" hex bore).
You’ll see it’s quite a large and heavy wheel for such a small motor…
It’s a “feeling” since calculations rarely take into account the inertia of the wheel itself. Consider making a 3D CAD model of the project (many free 3D CAD software out there). What additional weight do you plan to add?
