CIM Motor Sacrifice

[androb4]

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.

[VKP]

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.

[Mk.32]

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?

[davidthefat]

Originally Posted by Mk.32

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?

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

[sanddrag]

Originally Posted by davidthefat

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

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

[Djur]

Originally Posted by Mk.32

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?

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.

[sanddrag]

Originally Posted by Djur

Replacing 2 with FP motors will help, but you'll get weird, unequal forces that are really only good for a basic 4wd robot.

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

[Cem8301]

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!

[Djur]

Originally Posted by sanddrag

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

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.

[sanddrag]

Originally Posted by Djur

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.

Fair enough. I see your point now.

[Garrett.d.w]

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.

[waialua359]

Originally Posted by Garrett.d.w

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.

This is EXACTLY what I would do.

[Mk.32]

Originally Posted by waialua359

This is EXACTLY what I would do.

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

[ks_mumupsi]

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.

[Peter Matteson]

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.