Mecanum vs X-Drive in Change Up

Out of curiosity, why do you think this?

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Mechanums generally require a wider than normal chassis but with an x drive the front is angled inwards so you could go further into the corner

However, just note that in the one reveal that used an x-drive so far (210Y)

the extension of the intakes actually prevents the robot from nesting in the corner.

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I’ve tested this in CAD, and a 35 hole wide chassis fits just fine in the corners

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That’s good to know, I don’t have to worry so much about width

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Don’t mecanums have turning issues though?

Like in this thread

They are slightly slower when turning if put on correctly, but when put on backwards they develop the problem described in the thread

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I have a 25 hole wide mecanum drive CAD-ed right now

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That is very much a preference. Many drivers don’t have the certain skill type to maneuver around people as much. Others don’t really know how to push through defense the right way.
Now in this context, between the two drives I agree. If your gonna go with strafing just go all out and focus on sites and maneuverability.

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Yeah, which is why in my opinion an x drive is a better option for this game.

Mecanums are easier to code and have more power, whereas X drives are more mobile (and fun to drive XD)

Not really, the code to control mecanum drives and X-drives is actually virtually identical. The other arguments are valid though.

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How much more power would you say a mecanum drive has over an x dirve? I have not used either so asking for maybe some personal experience with the drive trains if you have used them before.

it doesn’t have any more power. it has more torque, less speed. same amount of force, maybe a bit more because mecanum drives have a bit of friction loss.

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Mechanum wheels have an ample amount of torque from my experience (comparable to tank drive with same setup)

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The power could only come from the motors. But different wheel types have different coefficient of friction. So your pushing power depends on the output torque of the motor, type of wheel, mass of the robot, and direction in which you push.

With X-Drive and mecanums if you try to push at 45 deg then only two of the wheels could push, because rollers on the other two will free roll in that direction, thus power out of two out of four motors is wasted.

If you push forward all four motors work, but you get friction in the rollers.

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Easier to code? The drive code has always been the same for both in my experience.

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I think x is better as there is more mobility (diagonals for auton) and it is faster than a mecanum drive. This game is about speed, and since the field is pretty much open speeding across is going to be a necessity.

I think that one thing that people overlook with mecanums in terms of speed is that their higher torque should result in better acceleration. Also, mecanum drives can be easily geared up to around the same speeds as an X-drive while maintaining higher torque, whereas x-drive gearing while possible is more difficult and bulky and sacrifices even more torque to which is already lacking. For example, a 4 inch 200 rpm Omni x drive is about as fast in the axial direction as a 280 RPM mec drive.

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If you gear the mecanum to the same speed of the X drive, then you lose torque.

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