Mechanum wheel intake


So I’m thinking about prototyping a mechanum intake like the one shown in this video, as it would allow me to run into cubes and suck them up without using a motor for a tilt mechanism. Problem is, I’d have to use at least two mechanum wheels and likely a linear slide bar on the end of my one motor lift to do it. Do you think this is feasible? Or should I even prototype the idea?
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That’s actually a clever use of materials, I might incorporate that into my design now. That being said, as is, there are a few key factors with the given design that might cause you trouble.
There are a great many flaws that I see with this being in TT, but you should never turn down prototyping it. The biggest flaw that I see is that it is limited to two cubes at a time. A few other problems I see possibly damaging this intake are:

  • cubes slipping out and falling since there’s no support underneath the cubes that would work well with TT
  • the cubes in the video didn’t seem to always be straight
  • you run the risk of the DR4B tray issues that the forum is discussing at length

If you think these are solvable issues, have at it. This is a unique intake and I might be very wrong about much of what I am writing. I think your biggest issue is that it will be slow compared to preexisting DR4B and tray stackers.

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If you are working throughout the summer, no reason not to prototype it, even if its just a quick test to see if it works. See if you think its a feasible design through your tests, and go from there.

No reason to limit yourself based purely on speculation if you have the time and resources available to you to test it first.

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Wasn’t 81k’s first design a vertical chute with rollers? You might not need mecanum wheels for this.

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The advantage with Mecanums/ omni wheel intakes is the ability to drop stacks off w/out having to either push rollers out of the way or lift up to the top of the placed stack to move away.

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You shouldn’t have to push the rollers out of the way, just spin them in reverse when you back up.

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Depending on how your rollers are set up/ where they will be mounted, spinning them in the opposite direction might cause issues when stacking

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I would think you have to mount them almost vertically for maximum efficiency.

Literally just put this on a DR4B and that is good. That being said, it takes more motors than a passive reverse stacker and is much bulkier.

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we tried this, it actually does not work with omnis because the green “mini-wheels” on the wheel are not parallel, so the cube does not come out cleanly. for this you need the discontinued omnis with only one mini wheel set on them.

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I’m gonna be honest it doesn’t look like a good idea

I actually thought of a similar intake, but I don’t have mecanums to prototype. I really liked the idea, though.

Alas, the TT cubes aren’t perfect cubes, and the variants in the cube sides (those little lips on the edges, to be specific) might cause a problem.

That’s why those conveyor rollers are somewhat popular: to account for Cube variances by having a pliable intake.

If you have the materials and time, this unique design is totally worth exploring. You might come up with a variant of it that surprises yourself. :wink:

If only compliant wheels were such a thing in vex

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That’s why we made compliant wheels from conveyor belt!

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This is insane! I bet someone could figure out how to make it work. Imagine a huge tower of mechanum wheels on each side. 4m base, 1m tower scorer (somehow, passive claw?) , 1m claw separater (like the one in the video :point_up_2:) , and 2m mechanum intake. Cool idea though

Why wouldn’t you just use conveyor belts? They are lighter and can most likely move faster. The only advantage I see is the fact that it would be easier to release.

With a design like the one shown above, intaking happens in two stages: first cubes are pulled horizontally in towards the robot, then they are pulled vertically up into the robot to make the stack. A belt can only do one of those things at a time.

Trays get around this limitation by holding the cubes (close to) horizontally, meaning the vertical intake step isn’t needed.

From what Ive seen, a custom mecanum wheel isn’t (for what it is building one is quite simple) too hard to make all things considered. So you would have tour weight and size issue solved, but the mecanum would likely have to be suspended in order to adapt to the irregular block face.

I think they have them but they’re all VEX Pro

Ye those are the ones I was referring to, along with the andymark ones