Looking for 3 Inch CIMs (2006/2007 KOP)

[Sarakiro]

Hi,

I am looking to get my hands on some 3 inch CIMs for personal/college club purposes- I have tried FRC garage sale with limited luck. If anyone has leads on finding some perhaps online or is willing to sell used ones either reply here or feel free to send me a private message.

Thanks FRC Community,

[Nathan Streeter]

Is there a particular reason you want them? As I recall they're bigger (obviously), a non-trivial amount heavier, and actually have a lower max power than a CIM (although I think at a lower speed).

EDIT: based on the 2008 JVN calculator, the Mini-Bike CIM has a peak power of 261W, free speed of 2600rpm, and a stall torque of 3.83Nm. It's basically a MiniCIM's power, but at about twice the torque and half the speed... and much heavier. I'd rather add a stage of gearing to a CIM or MiniCIM.

[Sarakiro]

It is mostly a matter of convenience. I managed to get my hands on one, so it will likely be cheaper to find some extra used ones than it is to buy more motors with gearing options. It also doesn't hurt that their output is relatively high torque and lower speed than various other options, which again- I would likely end up spending full price for anyway.

It is also easier to design for a product that I already have one of.

Thanks,

[AdamHeard]

Originally Posted by Nathan Streeter

EDIT: based on the 2008 JVN calculator, the Mini-Bike CIM has a peak power of 261W, free speed of 2600rpm, and a stall torque of 3.83Nm. It's basically a MiniCIM's power, but at about twice the torque and half the speed... and much heavier. I'd rather add a stage of gearing to a CIM or MiniCIM.

Depending on the application, you can view this as a pro or a con. If the goal is a longer duty cycle with weight being a non-issue, it's a pro.

The Mini-Bike CIM has a huge amount of mass, lower power, and higher efficiency than the CIM (and MiniCIM), which means it's far more robust. It being slower also means less reduction required to hit a given speed.

[Nathan Streeter]

Originally Posted by AdamHeard

Depending on the application, you can view this as a pro or a con. If the goal is a longer duty cycle with weight being a non-issue, it's a pro.

The Mini-Bike CIM has a huge amount of mass, lower power, and higher efficiency than the CIM (and MiniCIM), which means it's far more robust. It being slower also means less reduction required to hit a given speed.

Thanks for the further information!

I definitely agree that the lower speed/higher torque is generally much-preferred. I see what you mean that for a higher use cases (where weight isn't an issue) it would certainly be preferable to a MiniCIM or perhaps even a CIM. I guess I'm too accustomed to the 2.5min matches and weight/CG restrictions of FRC...

Getting back to Rob's request... I'm pretty sure 1519 doesn't have ours anymore. I suspect we traded them for FPs quite a few years ago.