I want some designs to make a robot go as fast as we can get, blue motors, friction wheels, gears, i want it all, if it can go fast i’ll do it. It does not have to turn, if you want it to turn ill do it, i just crave SPEED
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18 motor drive meta boi!!!
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I would personally go with a 4 blue motor drive. Use 4 small omni wheels and a big to small gear ratio. Have the big gears being the ones driving. This one should go at as much speed as possible. It also depends on how much weight you have in the middle of the chassis. The more weight, the slower it could get. We had a similar issue with our chassis that was imploding, and therefore, slowing down. Watch out for weight distribution and hope you try the 4 blue motor idea.
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Here are some considerations for making a VEX robot go as fast as possible:
- Weight (Use aluminum instead of steel and keep the chassis light.)
- Size (Consider resource availability to determine how many motors you have and how big you should thus make the chassis.)
- Friction (Use parts like bearings and washers, as well as possibly applying a lubricant if allowed by your competition. Additionally, use the search bar here on the vex forum to find low-friction building techniques by using searches like “reduce friction.”
- Torque (Consider how much you can gear the motors for speed before it becomes counterproductive with the motors lacking torque to rotate the axles.)
- Traction (Use high grip wheels like traction wheels.)
- Coding (Maximize what you can get from your motors with your code)
- Battery/Overall Power (Depending on the rules/constraints, you may be able to use multiple robot brains, each with lots of motors, to add more power.)
- Transmission (If you have a LOT of resources for motors and get to a point where having a transmission system like the ones in cars becomes worth the hassle, you can increase the robots potential for max speed by increasing the amount of gearing it can handle. When the robot is already going, the system has some inertia, which can be used to jumpstart the robot on overcoming the torque drawbacks of extra gearing for speed. This system can be stacked, but there is a point where it is no longer worth the hassle.)
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Ima upload one as a Protobot File. If you dont have protobot here is the website: https://protobot.web.app/
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Thats really cool, I didn’t know protobot was a thing, much less a thing for VEX
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I’ve done something like that before, i used the starter robot but instead of the big regular wheels I put the large omni-wheels in the back and the small friction wheels in the front but only the back wheels had motors so the friction wheels would move as fast as the rest of the robot’s wheels, it was a good design but I crave even more speed builds
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I’m not doing it for any competition (right now at least) I just want to find some designs/blueprints that give me a very fast robot, but i’ll try these tips later and see how much speed I can gain
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This would have so little acceleration that it would take quite a long time to actually get up to speed, 6 or even 8 motors would be much better.
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I just calculated it. So it turn out that if my math I right the robot that I’m not even done with designing, forgetting drag or inertia, is capable of going about 350 miles per hour. now it probably cant get that fast because there is no way the motors could accelerate it because, also based on my calculations, there will only be about 0.014 Nm of torque at the drive wheels which is a very small amount
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I have thought about stuff like this, make the robot as small as possible, and ideally with as light pieces as you can. My program did a challenge like this and one team used the direct cartridge technique to make the motor spin at 3600 rpm so you should try that
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as long as overheating isn’t a problem for you:
6 motor
Blue motors
2.75inch traction wheels
84:12
go crazy
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Compound gear. I leave it as that.
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One of our teams was bored recently and made this 14 motor drivetrain
All of the motors here are high speed and geared up
After testing in the parking lot, it was clocked in at about 20 mph
I don’t know how accurate this count is though.
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I would do that but my school has a little less funding so we have a limit of 3 blue motors and i doubt we have enough motors anyway, but i will certainly try (I should not try this)
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<R8b> is your friend here.
Do you have a video? I want to see this so badly.
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Wouldn’t you need to use lower watt motors though? The motor limit is 8 (of the bigger type) Wouldn’t you therefore go slower? I’m sure you’ll still need motors to complete other tasks if this is for next year’s game.
lucky for you I just finished my design that only needs 2 blue motors, 2 25-long
C-channels, 2 10-long C-channels, 7 shaft collars, 2 84-tooth gears, 2 12-tooth gears, a 1/8 in spacer, 4 flex wheels with 4in diameter, and axles with the following lengths; 8in, 7in, 4in, & 3in. you need one axle of each length. If you want to view it here is the file:
Sonic Bot.pbb if it doesn’t work try this one instead: Sonic Bot.pbb if that still doesnt work please tell me and i will try to find someway to add a functional download link for this file.
VEXforum team please add .pbb files as an accepted file type its how protobot saves your designs.
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Six is usually enough to be competitive, regardless of the game. I said eight because you realistically are not going to be able to run anything over 600 rpm with less than six motors, eight on the safe side. 4 will take far too long to accelerate to full speed.