Using 1 Motor to run 2 Mechanisms

Kia ora,

One of our teams is trying to figure out how to use 1 VEX IQ motor to run 2 mechanisms. They have used the max 6 motors and are wanting to power an extendable arm to touch the purple contact zone.

Does anyone have any examples or resources they could share so I can teach the team how to use 1 motor for 2 purposes.

Thanks from
Team 2223 - New Zealand

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You’ll have to use some form of motor sharing, look at some of these links:

Ratchets:
Our experience with Ratchet Mechanisms in Change Up (62X)
VEX Ratchet Tutorial
315G Ratchets Explained (6 motor drive, 2 motors for everything else)
Smallest vex ratchet

Differentials:
Vex Differentials Explained
Differential transmission - power takeoff from the drivetrain motors
Differentials —“Some help from my fellow SCA member”
Differential Concept
Please share some examples to understand Differential & Bevel Gear Pack use case for vexiq

While most of these are for VRC, many of them should apply for IQ.

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@Milo409B

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After talking with Milo at World’s, my kid learned about a mechanism to run two functions on one motor. He has flirted with the idea of making a video, crediting Milo for the inspiration. I will see if he still wants to make that video, he is working on another one at the moment.

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You could also use a PTO, but that would require pnuematics

You could also add more motors than the rules allow, but that wouldn’t be legal in VIQC either.

4 Likes

Investigate a slip gear, particularly with respect to rack and pinion.

Reminder they are talking about VEXIQ, there is no parts modifications allowed other than cutting axels to length.

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Understood. The concept can still work in VEXIQ using a rack and pinion. At the end of the rack, the pinion gear will start slipping.

Do you have a motor being used and dedicated for the blue dispenser only? You could use a pulley system that loosens the tension on the extension arm as the blue moves backwards (Relative to the blue), and then you can use a rubber banding system to propel the arm outwards. The string can tug the arm out a little bit, and the rubber bands can do all of the real work, but neither system can fully pull it out by themselves, alas, a hybrid system will work rather well. That’s currently what our team is using and it works great.

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Here is a video of a direction switcher (not my video). I built one of these a while back, and it seems to work nicely. The only con is that each side can only move in one direction; otherwise, the mechanism will switch to the other side. The video isn’t the best quality, but I’m sure it will click if you look at it enough.

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connect a rubberband triggered arm to the driveshaft

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