The Sabertooth itself will be providing the 5V power, so there’s really no worry. Just choose a standard 10k ohm linear pot.
Suggest a normal 300 degree pot. Your math seems fine.
Notice that we are partnered with that supplier and offer a Toughbox 12.75:1 here. Note that these are gearboxes only and don’t come with the CIM motor. It should suit your needs.
The gearbox itself should provide the mounting.
In theory having two motors connected to the same gearbox doubles the torque, so long as the gears can handle it. Note however that the gear ratio should still be above 12:1. Also, your controller will need to be quite powerful if you plan to operate the motors from one channel.
It’s not a product we carry, so unfortunately we cannot support it.
The AX3100S should be able to handle two CIM motors:
- 30s: 120A
- 1min: 100A
- 3 min: 80A
- 1h: 80A
The CIM consumes 20-25A, so two of them would consume 50A, which is less than 80A (which that controller can sustain for 1 hour). When climbing a slope, the current can increase to 100A, and that’s fine so long as it’s not for too long. There’s a lot of built-in protection, so it’s a good choice.
Almost all DC gear motors used in robotics do not have a clutch, so you’ll need to design and make one yourself, or find one that is (or can be made to be) compatible. Unfortunately we do not offer any clutch systems at this time.
You need to check the specs of each gear to see if they will mesh properly. It would be complete luck if they work together.
You plan to connect a 14 tooth gear to a 65 tooth sprocket using #25 chain? Maybe I’m just confused…
It is important to note that a chain cannot be used with a gear; gears mesh with gears, and chain meshes with sprockets (and there is a lot to take into consideration in each case). It seems as though you would benefit from a reference, such as the Robot Builder’s Bonanza. You may be able to soak up the entire book in about a week or so, especially given that you are interested in robotics. It would address simple questions like which potentiometer to choose, which motor controller, certain mechanical concepts etc.
It’s customization… you’ll need to check the specs to see if they mesh.
The speed is determined based on the voltage it receives - 2.5V is neutral. If you can come up with a combination of potentiometers that do what you want, that’s great, but note that the vast majority (99%) use only one potentiometer.
You could add a second potentiometer (call it a “min pot” to limit the reverse) to provide between 0-5V constant. For example, rotating the “min pot” would provide 1V to the system (constant), so instead of 0 to 5V, the system would be limited to 1 to 5V, meaning you could not go in reverse at top speed.
Not sure I understand the diagram - each potentiometer should have three leads: 5V; GND and signal. It’s been about three months - why not just see what happens with a normal linear 10k pot? It’s a lot of theory for what should be a very simple part of a project.