Running Banebots Transmission in Direct Drive
 

Does anyone think that running the Banesbot Transmission in direct drive is a bad idea?

Re: Running Banebots Transmission in Direct Drive
 

Most likely, that means you are only putting a 12:1 reduction on the CIM motor... which depending on what size wheels you are using could be a bit fast. Do the the calculations with the motor specs from here and figure out how fast you will be running. Then we can give you a good idea if its too fast, usually a fast FIRST bot is 10 ft/, and a slow bot would be 3-4 ft/s. All depends on how you are playing the game.

edit: I would worry about putting that much load on the shafts of the gearbox's, i would highly recommend putting the bearing blocks on the other end of the shafts if you are direct driving it.

Re: Running Banebots Transmission in Direct Drive
 

Running a CIM into the 12:1 banebots transmission with a 6" kitbot wheel gives you a 7.6 Feet/sec speed.

Going into an 8" wheel increases that speed to 11 feet/sec.

Re: Running Banebots Transmission in Direct Drive
 

with the KOP 6" wheel it turns at 11 f/s and that sounds right if you've seen one run

Re: Running Banebots Transmission in Direct Drive
 

It wouldn't necessarily be a bad idea if you used small enough wheels and supported the shaft. You can also purchase the gear change kit that would make it 16:1 instead of 12:1.

Re: Running Banebots Transmission in Direct Drive
 

If you up the gear ratio, and used four gearboxes on four wheels, it would be possible. Make sure you connect the wheels together with a chain to transfer even torque to the front or back of the bot (in the event of a pushing match). You'd also need to make or order a hub for whatever wheel you are using, as well as a pillow block to support the shaft.

Now - would I recommend it? Not really. Gear it down with chains, and if those are too heavy use belts and pullys. If space is an issue then use some type of slim-2nd stage output gearbox with the outputting shaft running directly to the wheels.

Re: Running Banebots Transmission in Direct Drive
 

CIM free RPM = 5500-5750 (depending on which individual motor you test)

Reduction = 12:1

Output Shaft RPM = 5500-5750/12 = 458-479

Speed with a 6" wheel = 458-479 RPM / (60 sec/min) * (2*pi*3") / (12 in/ft) = 12-12.5fps

Speed with a 8" wheel = 458-479 RPM / (60 sec/min) * (2*pi*4") / (12 in/ft) = 16-17fps

Keep in mind that those are numbers assuming FREE SPINNING RPM. In reality, we find the loss to be about 25%, so with a 6" wheel you can expect a speed of about 9-10 fps and the speed with an 8" wheel to be about 12-13 fps.