333X Summer Reveal

VEX V5 General Discussion General Forum
1

This is our summer reveal video.

https://www.youtube.com/watch?v=31RYEph8UH4

https://scontent.ford4-1.fna.fbcdn.net/hphotos-xap1/v/t1.0-9/11222462_813126412134768_7825364445546760134_n.jpg?oh=fe0668dc23bdcbb1f478e839b1236997&oe=561E1891

Specs:

Drive:
4 motor 1:1 (high speed)
X-drive
Pneumatic brake

Launcher:
4 motor flywheel

Intake:
2 motor over-the-top conveyor

Please feel free to ask questions or make comments on our video.

2

:o nice robot
What does it get in skills?
that music sounds familiar…

3

We haven’t tried a skills run yet but we’ll get back to you once we’ve had the chance.

4

Very cool robot. I found it interesting that you used two different sized wheels for your flywheel launcher. The other launchers I have seen use the same sized wheels. What advantages have you noticed using two different sized wheels rather than two same size wheels?

I’m also curious about your pneumatic breaks. I notice at 1:32 of your video you show one type of pneumatic break and at 1:34 you show another type of pneumatic break. Do they work together in some way to be more effective?

Maybe I’m missing something but I would imagine that the break at 1:32 of your video would bend the shaft of you pneumatic piston if you were pushed hard enough by another robot damaging an expensive piece of equipment. Have you had any problems with this?

Thanks,

Kelton

5

Very impressive robot. I am truly astounded at the quality this early in the season. Three quick questions though. what gear ratios are you using for your flywheels? How much time between launches for cross court shots? and what angle is your launcher at? Thank you

6

I’m very impressed! I would love to see how this robot fares in a match. But, I have some questions to ask to know more about your robot;

  1. Do you use high speed or turbo motors for your shooter?
  2. It seems that you also powered the 2 smaller wheels as well. May I ask what is the ratio for that as well?
  3. Any elevation ideas?

Thanks in advance!

7

The accuracy of that shooter, I can’t believe my eyes!

Just getting down to the small questions for ya:

1.Does your pneumatic brake lift your wheels off the ground or just simply apply friction to the surface of the tiles?

  1. Considering that you guys have a 4 motor shooter, is shooting from the loading zone less accurate than from shooting closer to the net? Also, it seems that your angle shooting from the loading zone is pretty high… It brings me to wonder, do your motors stall when constantly feeding balls into your shooter?

  2. If you guys were to use driver loads to shoot from the loading zone, would you be able to load them without having to access the intake on the front? I suspect that putting your hands in for a long period of time during the match trying to load through the front intake would be illegal.

  3. Your shooter has an interesting design. Could I know how did you come about to think of it?

8

Thanks to everyone for the awesome comments!
We’ve done our best to answer all of your questions:

  1. What advantages have you noticed using two different sized wheels rather than two same size wheels?

We built a similar launcher prototype with two 5 inch wheels that launched just as well as what we have, but it wouldn’t have fit inside of 18 inches. The main benefit was sizing.

  1. Do the two pneumatic brakes work together and make it more effective?

There are four brakes, two on each side, and they all fire at the same time. They slightly lift our wheels of the ground.

  1. The brake at 1:32 of the video would bend the shaft of the piston if you were pushed hard enough. Have you run into any trouble with that?

We have not had any trouble with that but thanks for pointing that out. We’ll consider changing our brake if we decide that it might become an issue.

  1. Gear ratios of the flywheels

1:10 on top, 1:15 on bottom

  1. How much time between launches for cross court shots?

We’re doing more testing today; we had some issues when we were filming that should be straightened out. I’ll post when I have the chance.

  1. What angle is the launcher at?

Not sure off the top of my head; I’ll post when I have the chance.

  1. Do you use high speed or turbo motors for your shooter?

High speed motors

  1. Any elevation ideas?

We’ll get back to you. Still mostly brainstorming and haven’t really developed anything yet.

  1. Is shooting from the loading zone less accurate than from shooting closer to the net?

We’re doing more tests today; from what we’ve seen it’s slightly less accurate.

  1. Do your motors stall when constantly feeding balls into your shooter?

Our motors have never stalled

  1. If you guys were to use driver loads to shoot from the loading zone, would you be able to load them without having to access the intake on the front?
    I suspect that putting your hands in for a long period of time during the match trying to load through the front intake would be illegal.

If we were to use our driver control loads, we’d need to access the intake in the front. Thanks for bringing this up! We’ll get back to you if we figure out a better way to load them.

  1. Your shooter has an interesting design. Could I know how did you come about to think of it?

Lots and lots of prototypes! We tried both one-wheel fly wheel and fly wheel designs, and in a way this was our effort to combine them.

9

I don’t think it really matters how much time you spend placing match loads. The rule is mainly intended to keep teams safe. As long as teams aren’t placing their hands in dangerous or illegal areas, then they should be fine.

10

Very nice robot, I have two questions are you planing to use 12 motors? If so how? If not are you going to use pneumatics? If so how? If it is a secret it is ok?

11

We use pneumatic brakes for our drive train.

12

Our launcher takes approximately 2 seconds between each cross-court shot, and is positioned at a 61.39 degree angle (rounded to the nearest hundredth).

13

We scored 17/24 shots from the loading zone so we’re still working on cleaning this up.

14

I noticed the encoders on the wheels of your drive train. Are you working on a self-aiming system? If so, Is it already in effect?

15

We are considering dead reckoning in order to adjust our launcher automatically.

16

Hi guys!
One quick question…

Is there any particular reason that your tanks are mounted where they are?

17

Very impressive robot! The speed and ease with which it navigates the field is astounding! Just a few questions:
-Did you guys try taking the motors off the top flywheel and putting all 4 on the bottom? (In other words, the top flywheel was free-spinning, thus providing a lower friction alternative to a hood)

  • Do you have any plans for elevation? Do you have any plan of driving up an alliance’s ramp with your holonomic drive base? Have you tested this yet?
  • Have you had any problems with low battery affecting flywheel accuracy in a match?

Thanks in advance for the incredible robot and the replies.

18

We did try to put all of the motors onto the bottom wheel but it did not work very well. We do have some plans for elevation. We do have issues with the battery running low and affecting our accuracy. We are currently working on solving this issue.

19

https://scontent-ord1-1.xx.fbcdn.net/hphotos-xta1/v/t34.0-12/12030764_846531068794302_1706040013_n.jpg?oh=86fd72efbf69702df06de4bb901c6580&oe=55FC77A8

[32 Ball Run #1 - YouTube

These certainly weren’t our best runs but they weren’t bad. We’ve made a few slight changes to our launcher and we’re still working everything out.

Feel free to post questions or comments, and any advice is greatly appreciated.](32 Ball Run #1 - YouTube)

20

You mentioned that you made a few changes to the launcher.
What were they, if I may ask?