CIM Motor Sacrifice
 

I was wondering how many people are thinking of sacrificing their CIM motors to use on their ball shooter or something else and just have 2 CIM's on the drivetrain.

Re: CIM Motor Sacrifice
 

Thinking about it? Definitely. Cims would be really helpful for a powerful shooting mechanism. We are of course wondering if we can run the robot over the barrier and the ramps fast enough with only two CIMS powering the wheels.

Re: CIM Motor Sacrifice
 

You can add an FP motors as the 3rd/4th drive motors.

Though for a shooter, is the CIM really that much better then a FP motor?

Re: CIM Motor Sacrifice
 

Stall Torque: 2.42 N-m, or 343.4 oz-in

vs

Max torque (stall): 450 mNm (63.4 oz-in)


I believe quite a difference

Re: CIM Motor Sacrifice
 

Apples and Oranges. It's all about power not just torque.

Re: CIM Motor Sacrifice
 

FP motors actually seem to be a bit better than CIMs.

In any case, using only 2 CIMs for drive will halve the power of your robot. Replacing 2 with FP motors will help, but you'll get weird, unequal forces that are really only good for a basic 4wd robot. Using 2 FP motors for a shooter and 4 CIMs for the drive keeps the drive consistent in terms of power and allows you to use different types of drive, especially omni/mecanum, which are practically impossible if you're using motors with different torque and speeds.

Re: CIM Motor Sacrifice
 

Not to be rude, but there's some faulty logic and a heck of a false-statement if I've ever seen one.

Re: CIM Motor Sacrifice
 

Would you guys mind clarifying your choices? My team has been looking into motors to serve a pitching machine styled launch system and I was originally thinking that we would start with the motor with the highest rpm... and hadn't even considered using Cims here. What should we be looking for in relative motor torque vs rpm? Thanks!

Re: CIM Motor Sacrifice
 

I'm coming from a team that has only ever used mecanum while I've been on it, so I'm probably exaggerating by a lot. But my omni/mecanum statement still stands.

Re: CIM Motor Sacrifice
 

Fair enough. I see your point now.

Re: CIM Motor Sacrifice
 

Back to OP, this year we are placing a BB 775 with a CIMulator gearbox in places where a CIM would be normally used.
You could do this on your drivetrain or anywhere else really. If you are going to build a ball pitcher, I would use the 775s and keep the more powerful CIMs for drive.

Re: CIM Motor Sacrifice
 

This is EXACTLY what I would do.:)

Re: CIM Motor Sacrifice
 

If we go with the shooter, probably what we would do.
Use the FP/775 and leave the CIMS in drive.

Re: CIM Motor Sacrifice
 

In general I think you will see a lot of 775 based shooters. This years motor allowance gives a lot of variability of what you can and cannot do, you can go 775 cimulators for the drive or the shooter/ vice versa.

Re: CIM Motor Sacrifice
 

We have faaaaaaaaaaaaaar more motor power than we ever had available in the past this year. If you you can't figure out how to use the 22 available motor to make all you mechanisms and drive work then I would love to know what you're planning. We may not have the mini-bike motors we had during 2006 but we have far more power available with the replacements.