Cim-Sim gearbox for shooter questions

[Ether]

Originally Posted by RoboCat2005

Thanks we worked hard on the system for getting over, we based it on the NASA Rocker Bogie system.
To answer the questions:
-2 Fisher Price motors
-Started with 6" now has a 4" in it
-With the 6" it had about an 1.5" almost 2" of compression, although it happens early and the exit is a little less then at the beginning.
-it bogs the motors down quite a bit as the ball drops in
-Each motor is hooked up to a jag each and the motors run at full speed when the ball is introduced.

what Fisher Price motors are you using? there are 5 different legal FP motors this year

what is the gear ratio from motor rpm to wheel rpm ?

how fast is the wheel spinning ? -or- how many amps is the motor pulling ?

[RoboCat2005]

Originally Posted by Ether

what Fisher Price motors are you using? there are 5 different legal FP motors this year

what is the gear ratio from motor rpm to wheel rpm ?

how fast is the wheel spinning ? -or- how many amps is the motor pulling ?

-We are using the 2 new FP that were in this years kit.
-Gear ratio off of the output of the gear box is a little over 1:1, a 24 tooth sprocket on the gearbox to a 22 tooth on the wheel.
-honestly could not tell you how fast the wheel is spinning or the amperage.

[nitneylion452]

Originally Posted by RoboCat2005

-We are using the 2 new FP that were in this years kit.
-Gear ratio off of the output of the gear box is a little over 1:1, a 24 tooth sprocket on the gearbox to a 22 tooth on the wheel.
-honestly could not tell you how fast the wheel is spinning or the amperage.

What is the reduction in the gearbox?

[Ether]

Originally Posted by RoboCat2005

-We are using the 2 new FP that were in this years kit.

I'll assume that means FP00968-9013

-Gear ratio off of the output of the gear box is a little over 1:1, a 24 tooth sprocket on the gearbox to a 22 tooth on the wheel.

Well, if everything was spinning freely with no friction,

16700	motor free rpm
5	gear reduction
0.917	gear reduction
3642	wheel free rpm
60.7	wheel free rev/sec
4.0	wheel diameter, inches
1.05	wheel circumference, feet
	
63.6	wheel tangential free speed, ft/sec

That ought to be plenty fast.

How tight is that chain ?

honestly could not tell you how fast the wheel is spinning or the amperage.

That's a critical piece of info to diagnose the problem from afar.