Poll: How many CIMs are you using?

[PayneTrain]

Originally Posted by Anupam Goli

I take it you're using a PTO? or a clever passive intake + low goal mechanism?

We're using 4 CIMS in our drivetrain, as well as 2 miniCIMS, 3 BAGs, and maybe another CIM or 2 elsewhere. (power hungry robot...)

Skid drive with two rear wheels powered by a 775pro and 4 CIMs on the climber.

[jkelleyrtp]

I'm curious as to the appeal for bag motors for the intake. Originally we had bag motors as well, but after the reduction required to get that 13,000 rpm to something usable and the potential for busting a motor, we switched to a minicim. It's more robust, requires less reduction, and can be run longer without overheating. The two disadvantages would be the size and power draw, but I don't find it significant enough to get a 100:1 versa and not direct drive.

[piersklein]

4 CIM
2 Mini CIM
3 775pro

[BetaHelix]

4 Cim drive
2 Mini shooter
2 Pg intake actuation
2 775pro intake roller

[jwfoss]

FRC558 Currently sits at:
6 CIM motors
4 775pros

[smclean1969]

4 full CIMS for the drive train
1 full CIM for climbing
2 mini-CIMS for the shooter
5 bag-CIMS for shooter and defense manipulation

[apalrd]

Originally Posted by jkelleyrtp

I'm curious as to the appeal for bag motors for the intake. Originally we had bag motors as well, but after the reduction required to get that 13,000 rpm to something usable and the potential for busting a motor, we switched to a minicim. It's more robust, requires less reduction, and can be run longer without overheating. The two disadvantages would be the size and power draw, but I don't find it significant enough to get a 100:1 versa and not direct drive.

It's all about power and weight.

BAG motors are good for ~150 watts of power and is listed at 0.71 lbs
MiniCIMs are good for ~215 and 2.16 lbs

So changing from a BAG motor to a MiniCIM gets you ~45% more power but with 200% more weight. For comparison, a 775Pro is rated at 130% more power and 12% more weight to a BAG.

If you don't need 215 watts, a BAG motor is a lighter and smaller alternative. If you need 215 watts or more, than the BAG motor isn't the right choice. Overall though, it's an excellent motor for most small mechanisms on robots.

[mman1506]

Originally Posted by apalrd

It's all about power and weight.

BAG motors are good for ~150 watts of power and is listed at 0.71 lbs
MiniCIMs are good for ~215 and 2.16 lbs

So changing from a BAG motor to a MiniCIM gets you ~45% more power but with 200% more weight. For comparison, a 775Pro is rated at 130% more power and 12% more weight to a BAG.

If you don't need 215 watts, a BAG motor is a lighter and smaller alternative. If you need 215 watts or more, than the BAG motor isn't the right choice. Overall though, it's an excellent motor for most small mechanisms on robots.

Your forgetting about the reduction. You need roughly 4x the reduction for a 775 pro compared to a CIM. More than often this requires multiple reductions (with hard to find gears) or a VP adding weight, complexity and size.

[apalrd]

Originally Posted by mman1506

Your forgetting about the reduction. You need roughly 4x the reduction for a 775 pro compared to a CIM. More than often this requires multiple reductions (with hard to find gears) or a VP adding weight, complexity and size.

You wouldn't need reduction on a CIM or MiniCIM? Relatively few mechanisms work well without any gearing at all.

A VP stage and ring gear (not including ends) is 0.132 lbs, well under the weight difference if you just need an additional 4:1 stage in an existing gearbox. You could also use a CIMile for the 775Pro (but not BAG motor) which weighs 0.4 lbs, still under the weight delta of switching to a CIM.

There are also many suppliers of 32dp gears or small pitch belts which can be mounted directly on a 775Pro shaft. There are plenty of ways to use these great motors.

[dradel]

Our team is using 775's and also vp for the first time this year. Have to say the 775's are a nice little motor. And I wish I had found the vp a couple years ago!