FRC Team 271 teaser
 

FRC Team 271 12cim 2 speed transmissions. Lets play some defence at championships this year (2015).

Re: FRC Team 271 teaser
 

So... do the other 6 CIMS get cheesecake-tethered to another robot to satisfy [R18]?

Re: FRC Team 271 teaser
 

Please tell me that entire transmission powers one can grabber.

Re: FRC Team 271 teaser
 

I will do no such thing!

Re: FRC Team 271 teaser
 

Making an electric gokart with that?

Re: FRC Team 271 teaser
 

that makes 6HP

Re: FRC Team 271 teaser
 

That is more than enough for one :D

Re: FRC Team 271 teaser
 

Is that a power take-off I see?

Re: FRC Team 271 teaser
 

I would love to see this thing in person

Re: FRC Team 271 teaser
 

It would make sense if they were min-cims... them being unlimited this year and all...

Re: FRC Team 271 teaser
 

Thats beautiful.

Re: FRC Team 271 teaser
 

Peak? 133A * 12v * 12 motors = 19152w, or 25.6HP?

Re: FRC Team 271 teaser
 

From Andymark's website each CIM produces 337Watts at maximum power.

337 per CIM * 6 motors = 2022 Watts per transmission assuming no power loss.

1 HP = 745.7 Watts (1)

2022/745.7 = 2.71 HP per transmission.

Edit: This is why using stall current for power doesn't work for DC motors



from this page

In other news, I just realized why some people use 5310RPM as the freespeed of a CIM. Assuming the CIM behaves like described in the MIT coursework, peak power occurs at 2655RPM and in the middle of the RPM range. Doubling 2655 yields 5310RPM as the max RPM for a CIM

(1) Wolfram Alpha

Re: FRC Team 271 teaser
 

Those are our 2014 transmissions on top of our 2013 transmissions, but that now give me an idea *opens inventor and starts a 12CIM can grabber*, I mean who needs a drive train anyway!

Re: FRC Team 271 teaser
 

That's 33.6lbs of CIMs alone, let alone the gears (heck the gears look like steel too) on that thing. Would it be possible to get a weight on those? what on earth needs that much power?

Re: FRC Team 271 teaser
 

That's how much power the transmission would require at stall, but the output power at stall is 0 hp because the motor isn't spinning and isn't doing work.

The output power for a motor is equal to force x velocity or rotational velocity x torque. At free speed, you have a large rotational velocity but no torque, and at stall, you have lots of torque, but no rotational velocity. Halfway in between is where you'll maximize power.

Re: FRC Team 271 teaser
 

Nothing. Nothing needs that much power. But a combination of our 2013 and 2014 drive transmissions when you stack them together and take a picture makes it look like one sweet canburglar gearbox. A two-speed power take-off canburglar.