Wiki

Building the robot - what constitutes the robot - basics

VRC Legal definition of the robot (according to the Game Manual <R1>)

TBD

Example

https://www.youtube.com/watch?v=3yedhYdeiLM

Details

Brain, Battery, VexNet, and most importantly license plates: 7580A 2015 Robot Reveal.

Just kidding

https://help.vex.com/category/369-engineering

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Overview of common chassis types

How could we help a new team to choose a chassis for the robot?

Drivetrain Type Pros Cons
1. All omni tank drive - easy to build - can be easily pushed to the side
- 2 or 4 motors
- can be chained front-back
2. H-Drive - all advantages of tank drive - needs extra motor
- tricky to distribute weight
3. X-Drive - resists pushing - harder to build
4. Mecanum TBD TBD

Omni wheel vs Mecanum

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Overview of frequently used Lift Types

  1. 2-bar
  2. 4-bar, 6-bar
  3. DR4B
  4. Cascade
  5. Chainbar
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Overview of frequently used intakes

  1. Claw
  2. Side rollers
  3. Top roller
  4. Forklift
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Best Building practices (general)

  • bearings

  • screw joints

  • Types of nuts

    • Nylocks are heavier, but have much greater grip. They likely will not significantly loosen even after extensive use. Additionally, not tightening them (and allowing the screw to spin freely) is perfect for rotating joints.
    • Keps are lighter and are the quickest to use. Their teeth help maintain its position when tightened, but not as much as nylocks and cannot be rotated once tightened. Perfect for prototyping or securing less vital structure.
    • Plain nuts are the lightest and are used mostly on parts with places for the nuts designed onto them, such as the clamping shaft collar or V2 rack gears.
  • basic gear ratios

    • Builders can trade motor speed for motor torque (and vice versa) by using a system of gears to change the speed of the output shaft.
    • gears have a set number of teeth, and when gears mesh, the output gear rotates however many teeth the input rotated, not the number of rotations the shaft went through. Builders can use this to their advantage so that the output gear rotates faster, but with less torque (larger gear -> smaller gear), or slower but with increased torque (smaller gear -> larger gear).
    • If gear sizes become too extreme, more advanced builders may use compound gearing to exponentially modify their gear ratios. This is done by having the output shaft from previous gearing become the input shaft for more gearing with different gear sizes.
  • no cantilevered drive wheels

    • As a general rule, for anything on a shaft other than shaft collars and washers, the shaft should be secured to structure on both sides of whatever it is supporting.
    • Not doing this results in the shaft having a lot of wiggle room, as typically seen when wheels are exposed on the outside of a robot.
  • spacers, standoffs mounting

  • use all omni drive base with 4 motors

DR4B Tutorial by 333A

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Other important build topics and examples

TBD General

  • Geartrains
  • Chaindrives

VEX Reference Build instructions for starter kits

Tower Takeover Season Specific

Theory:

Physics of Tilter
How To Fix Intake Compression [Guide]

Showcase Tilters:

448X, 21S, 6671X, and 1437Z RI3D Reveal
1961Z Tower Takeover Teaser: Mk. III
42700N Summer Reveal
25461Z early season reveal: https://youtu.be/Wvz_8Ja-JQw

Showcase DR4Bs:

97963A Early Season Reveal
Robot in 3 Days Reveal: Houdini | 9605A + 9421
VEX Tower Takeover 21000C 66 Point Driver Skills (Robo Bonanza @ Beckman)

Showcase Wallbots:

2019 NorCal RI3D Reveal

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Programming environments, links to help and tutorials

https://www.learncpp.com
https://www.tutorialspoint.com/cprogramming/index.htm

V5:

Cortex:

TBD: Supported languages, platforms, blocks vs text, which one to choose…

API Reference:

Tutorials

LVGL:

For pre-V5 (Cortex) hardware:

https://www.robotc.net/wikiarchive/Tutorials/Getting_Started/Getting_Started_with_the_VEX_CORTEX

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Programming: Getting Started with VEXcode

  • Motor config
  • Sensor config
  • Competition template
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Programming: Common Beginner Mistakes and FAQs

TBD

Note:

make process closed with exit code : 2 means ‘code could not compile, your code probably has errors’. When creating a thread for help, please attach the whole log with your code.

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V5 Architecture and Troubleshooting

V5 architecture diagram (may need to move to advanced topics): The PROS of PROS

V5 Troubleshooting:

Tips/warnings for v5?

  • V5 mini USB Port / use magnetic cable
  • V5 Motor inserts / be careful
  • V5 ports and static
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Engineering Design Process

https://www.google.com/search?q=engineering+design+process
TBD

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Engineering Notebook Resources

(Screen for redundant / duplicate topics)

Design Award Tips?
Starting the Engineering Notebook
2915A Engineering Notebook 2016
Notebook Tips
Engineering Notebook Tips Selection and Strategy
How should I start off my notebook? (Summer without teammates)
what are Some Tips to add to the Notebook?
Engineering Notebook Expectations At Worlds
Example of an award winning notebook?
What is the best piece of advice you could give for an engineering notebook to be successful?
Notebook setup/layout


engineering notebook 1575A 2015-2016.pdf (45.0 MB)

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CAD software: links, tutorials, tips

VEX w/ Fusion 360 Tutorials

https://www.autodesk.com/education/competitions-and-events/vex/recommended-software

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Preparing for the competition day

References (redundant?):

https://www.roboticseducation.org/resources-library/
101 Things I Wish I'd Known Before My First VEX Tournament
Advice for first competition?

https://www.vexwiki.org/robotics_competitions/101_things
https://www.roboticseducation.org/documents/2013/06/101-things.pdf/

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Tips on how competition works

To be expanded:

  • Qualifications
  • Scouting
  • Alliance selection
  • BO1
  • Skills
  • Judging
  • Who qualifies
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Beyond the competition

What else is there in VRC beyond going to competitions?

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School based vs independent team / fundraising

TBD

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Tips for organizing the team

Getting Started in Robotics (Tips and Advice)

https://www.roboticseducation.org/resources_library/how-to-start-and-organize-a-vrc-team/

List of products/items to purchase?
What parts should I not buy?

Should this be here or moved up to post 25?
Help motivating procrastinators to do their job
How to help combat un-involved team members

How many people on a team?

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Tools

Sort tools in order of importance…
Add pictures?

  • wrenches 1/4, 11/32
  • screwdrivers hex (5/64,3/32), star (T?)
  • pliers, needlenose pliers, diagonal cutters, etc…
  • tabletop grinder
  • dremel

Custom Tools:

Tips:

Don’t strip screw heads - sharpen Hex screwdrivers regularly!

Safety considerations:

Wear goggles!!!

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Alternative part sources

https://www.robosource.net

VEX Cost Reductions
Vex Low Cost Identical Legal Parts Compilation
Cheaper Option for Nylon Washers

Cheap Alternative Tiles

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