Gearing up two cims?

[eklaw]

Are there any gear boxes that allow to gear UP two cims to something between 1:3 and 1:4? Preferably single stage. Thanks!

[dellagd]

Not a gear box, but it can easily be done with chain (though thats a VERY fast output.)

[Andrew Remmers]

MODULOX!

In all seriousness, Its what we used in Robot in 3 days. Worked fantastically.

- Andrew

[Ether]

Originally Posted by eklaw

Are there any gear boxes that allow to gear UP two cims to something between 1:3 and 1:4? Preferably single stage. Thanks!

I'd be curious to know what you want to do with this, if you don't mind sharing.

[Ether]

Originally Posted by Andrew Remmers

MODULOX!

In all seriousness, Its what we used in Robot in 3 days. Worked fantastically.

- Andrew

Hey Andrew,

Since you're reading this thread, maybe you could give a definitive answer to a question that's been bouncing around:

What CIM operating speed did you finally settle on for your shooter, and what speed control algorithm did you use?

[eklaw]

Originally Posted by Ether

I'd be curious to know what you want to do with this, if you don't mind sharing.

We're looking at using 2" belt pulleys with belts around them as a linear shooter and want to use 2 mini cims to augment our max output speed

[Chris is me]

Honestly, if you are using such a small pulley, you could try something with a small (or no) reduction off of a faster motor like an FP or RS-550. The power difference isn't too noticeable in a flywheel and you will have a less frustrating time designing your shooter.

[dtengineering]

Yeah, I'd definitely recommend considering gearing down an FP (or similar) rather than gearing up a CIM.

We used a single FP with a 4:1 or 5:1 banebots planetary to shoot nerf balls about 30' back in 2006. So long as you keep them moving at a decent RPM most of the time they don't overheat.

Jason

[Gregor]

Originally Posted by dtengineering

Yeah, I'd definitely recommend considering gearing down an FP (or similar) rather than gearing up a CIM.

We used a single FP with a 4:1 or 5:1 banebots planetary to shoot nerf balls about 30' back in 2006. So long as you keep them moving at a decent RPM most of the time they don't overheat.

Jason

Interestingly enough, the FP motors aren't legal this year. New miniCIM and BAG motors make up for them though.

[Ken Streeter]

Originally Posted by Gregor

Interestingly enough, the FP motors aren't legal this year. New miniCIM and BAG motors make up for them though.

The Banebots RS-550 is very nearly a drop-in replacement for the Fisher Price motor, with the exception of the output shaft not being knurled, and the motor having a little less power.

In Logomotion 2011, we drove our entire arm off a single Banebots RS-550 motor, appropriately geared down (about 750:1).

[Andrew Remmers]

Originally Posted by Ether

Hey Andrew,

Since you're reading this thread, maybe you could give a definitive answer to a question that's been bouncing around:

What CIM operating speed did you finally settle on for your shooter, and what speed control algorithm did you use?

I'd have to say that I wasn't there for when the robot was programmed so I don't know what kind of speed control algorithm was used. However we did have a CIM that was operating less than optimal. It was geared up and I would guess the speed was closer to around 6-7k rpm. With the final shooter wheel running at about 8-9k rpm (perhaps even faster). I honestly don't remember the gear ratios but this was the estimated speed when we built it.

- Andrew

[Saberbot]

If you're still looking at using a CIM, AndyMark is working on a product called the spin box that should be available in the next few weeks that is designed for gearing up CIMs. Andy and I discussed it over lunch

[F22Rapture]

Originally Posted by Saberbot

If you're still looking at using a CIM, AndyMark is working on a product called the spin box that should be available in the next few weeks that is designed for gearing up CIMs. Andy and I discussed it over lunch

Do you happen to know if this SpinBox has a shaft for an encoder?