Problem with arm lift losing power

my team built a double bar lift that works great when they first power up bot and lift first 2 cubes. when they go to lift a third cube the arm doesn’t have enough power and cant lift the cube at all. Then they get a red blinking light on the brain. The lift has a motor on each side. Anyone ever heard of this before?

Do the motors feel hot? What are the motors geared to? What error does the brain get?From this it’s either A the motors can’t handle the load or B the brain is messed up.

The motors do feel hot. And we hear that long beeping sound as if motors are working too hard. There is no error code on the brain, it just blinks red until we turn it off and back on again.the gear ratio is 12:36:36

That sounds like your motors are working too hard and overheating. A few ways to fix this is to reduce their load, rubber band it, or gear it slower. I am not for certain since I have never been in iq, but you could burn out your motors and make them worthless.

Your ratio, 1:3, isn’t strong enough to lift in iq. I’d try to move to 1:5 minimum but 1:7 is probably better.

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Are you certain the motors are not working against each other? My team built a single 4 bar lift with 1:3 Gear Ratio and 1 motor and it works the entire match.

Their bot is very small. I don’t know which gears to use to make it 1:5 or 1:7. Is there a diagram out there we could look at?

You could look up “gearing ratio vex” and some things would pop up, but smallest to biggest gear you have is optimal.

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A 12 tooth gear driving a 60 tooth gear gets you 1:5 . EDR has 84 tooth gear, so you could get 1:7 there, but I’m struggling to come up with a compound gear box that gets to 1:7 in IQ

Can you post a picture that gets to the details of the gear box?

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Ok. we figured out a way to gear it 1:5 but it took away the last inch they needed to lift to the high green platform. we havent tested it on the field yet.

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That high platform is THE challenge. :wink:

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