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.

[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.

[Dutch8az]

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.

My team is looking into motors for a launching device and you seem to know what you're talking about. Now for the amateur question: what is the BB 775 motor and the CIMulator? Where might I find specs on it or at least somewhere to buy it?

[Daniel_LaFleur]

Originally Posted by Dutch8az

My team is looking into motors for a launching device and you seem to know what you're talking about. Now for the amateur question: what is the BB 775 motor and the CIMulator? Where might I find specs on it or at least somewhere to buy it?

BB775 is a BaneBots M7-RS775-18 Motor. Specs can be found here.

CIMulator is a gearbox that will mount 1 or 2 BB 775s and give you an output shaft and output mounting holes of a CIM motor (Basically it allows you to fit BB775s where you'd use a CIM motor). Specs can be found here.