Direct drive minibot - output diameter?

[Tristan Lall]

Originally Posted by jacob9706

Does anyone know the rpm of the tetroxide motor without the gear box?

As in dinitrogen?

The Tetrix motor (without gearhead) spins at roughly 7 350 rev/min, according to the data collected in this thread.

[Ether]

Originally Posted by jacob9706

Does anyone know the rpm of the tetroxide motor without the gear box?

Tristan gave an answer in the previous post, but just curious, why do you ask?

The Tetrix motor has a speed v torque curve which is more nonlinear than other motors in the FRC kit. If you linearly interpolate between free speed and stall torque you'll get answer for max power notably larger than the true value. For LogoMotion it makes more sense to use a linear interpolation between stall torque and max power (@rpm) for motor calculations.

[AlDee]

Originally Posted by DonRotolo

We also removed the brass gear and drilled our shaft with a #40 drill bit. A lathe was used to ensure concentricity of the hole to the shaft. We used the flatted tetrix shaft.

Any reason you chose the flatted shaft? I would think the round shaft would be better for balance at high speed.

[Doug G]

Originally Posted by AlDee

Any reason you chose the flatted shaft? I would think the round shaft would be better for balance at high speed.

After you put surgical tubing over the tetrix shaft it becomes quite round.