Spectrum 3847 - Build Blog 2022

2022 Day 1: Rapid React: Rules, Impressions, Strategy Questions, Climber Ideas

Game Manual (Rules): https://firstfrc.blob.core.windows.net/frc2022/Manual/2022FRCGameManual.pdf

First Impressions

This looks to be a very well-made game that will play well at all levels of play. Robots will be chasing down game pieces, launching cargo from all across the field, and playing strategic defense while trying to win every match. The end game climb has 4 levels the most of any game (2013 is similar if you count scoring the pyramid goal discs). This challenge will allow young teams ways to succeed early and still provide a very hard challenge for the top teams especially if they want to get to the 15pt rung fast.

The field looks to be designed very well and it seems like more time was put into creating the Team Versions of the field to provide multiple options for teams which is a big improvement.

The new organization of the game manual was a big improvement and executed very well, the new green rules will help the community remember the rule numbers much easier and the layout flowed very nicely.


We were able to have some of our team watch the stream in-person kickoff and then spend several hours reading over the entire manual and discussing the game strategy and concepts.

Questions (some answers)

  1. Tall vs short (What is tall? What is short?

a. Drive under the low bar (sub 48 in), max-height 52 in,

b. not critical but probably helpful to able to drive under the low bar if can still climb and score at that shorter height.

  1. The placement of each subsystem (intake and shooter on opposite sides? Something more like Gamma 2021?)


  1. How consistent are the balls going to be?

a. Can we accurately launch them with a flywheel from distance?
b. How much compression will we need?
c. What material wheels?
d. How much will balls be damaged/deformed, and will this matter?
i. This we very much need to test.

  1. High goal vs low goal? Both?

  2. Launcher Configurations?
    a. All the same options as 2020/21, flywheel, flywheel+top rollers, side wheels, etc.
    b. Catapult (probably not unless other things don’t work, slow to reload and we can hold two balls)

  3. Ball funneling to the shooter? Tower, indexer, etc.
    a. How consistently feed the ball to the launcher

  4. From what positions on the field should we shoot from?

a. Fender - Yes
b. How far back do we go after that??? Field Perimeter shot

  1. Floor intake, feeder intake, or both?

a. MULTIPLE INTAKES??? Probably not
b. Velcro intake roller?
c. How to get the balls to center? Meccanum intake? CD7?

  1. Do we ever intake opposing cargo?

a. Maybe right before we climb? Or if we are playing D.

  1. Will balls bounce out if we yeet them in too hard? How to experiment with yeet optimization?
  2. Turret Time? What is the value of being able to shoot while driving?

a. pick up one on route and shoot
b. Fast shooting once we stop moving is better

  1. Adjustable Hood?

a. Adjustable angle is more important with the horizontal goal?

  1. Spin ball?

a. Probably won’t matter but we can test it, backspin is probably best

  1. Are we gonna shoot from the launchpad?
  2. Hold one ball or two?

a. May score one at a time if needed but the ability to hold two will save time.


  1. Able to sense shadow line?
  2. How high?

a. Traversal rung matters? (Only 5 more points than high bar)
b. High Bar Matter? (only 4 more points than mid bar)
c. Mid Bar Matter? (Only 2 more points than low bar)
d. Low bar matter? (Only 4 points)
e. Should be climb at all? YES

  1. Climb how?
  2. Ideas:

a. Weight moved with pneumatics to influence swing
b. Other stuff on whiteboard and slides


  1. Where is the best shot?
  2. Where should we get balls?
  3. What are the likely auto paths for top teams?
  4. Max balls we think the best team in the world can score in auto? 5-6

Climber Ideas

We are still going through a lot of ideas but here are some of our whiteboard and cad sketches for our climber ideas.


  • Spectrum

2022 Day 2: Dabbling in Prototypes

Photo Gallery

Our 2022 photo gallery is up and will have updated photos and videos of our prototypes and progress this season.

Intake Prototype

We were able to use a prototype mechanism we built in the fall to begin testing how the balls interact with various materials.

We used 2" compliant wheels, polycarbonate tubing, and velcro wrapped around the tubing. All of them were able to intake the balls pretty well but the compliant wheels seem to do the best job of grabbing the ball in our limited testing.



Launcher Prototype

In 2020 used one of our 2017 launchers to build a prototype for that game pieces. We kept that around and adjusted it today to make it fit the larger 2022 balls. We adjusted it to 7.5" between the wheel and the hood to allow about 2" of compression on the balls. We have it mounted to our “ProtoCube.” We’ve used this 2x4 box for multiple prototypes and it works well since you can clamp or screw into it and weigh it down easily with sandbags.




We’ve also continued our discussion on strategy and robot goals. At the end of the 1st weekend this is roughly where we are heading, our course could quickly change as we learn more about the game and the game pieces.

  • Spectrum

Not sure if it’s just me, but when I click the hyper links in the above post, it redirects me to a page asking me to create my own blog. When I copy and paste the text of the first link (not the hyperlink, just copy the viewable text) I can get to the spectrum blog.


Same thing for me. It looks like the hyperlink is to an edit URL.

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Thanks for letting me know, it’s been a while since I’ve been doing blog posts, I have to get my routine in order for copying the posts to CD from blogger.

Should be fixed now.


Your link takes me to my own Blogger blog page.

Might leave the link out, until you can get it fixed?

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which one is still broken?

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I believe it is the very first link (to the game manual) at the top of the thread. The others all work fine for me at least.


We came to a good number these conclusions. I like the proto-cube. We have a similar proto-platform which often gets good use.

I am interested about the Velcro roller. My question is did you ever try reversing the intake direction? I was thinking about how a Velcro lift might work that direction.


We haven’t but we can tomorrow.


:+1:. What I’m thinking about is a roller length Velcro conveyor that goes all the way to bumper level. And rugged enough to leave deployed.

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Thank you for sharing your team’s experience. This is very useful. Could you tell what is the durometer of the 2" compliant wheel that worked?

Do y’all have any brushes? I’m interest to see if brushes can help deaden a bouncing ball better than the compliant wheels (which seem to be the best at that so far).

I have a design that has an outer brushed spinner bar as first contact with the ball, followed by compliant wheels to actually suck the balls into the robot floating around in my head.


The compliant wheels we tested with were the original Andymark red silicone compliant wheels from 2017 I think. Unsure of the durometer. We haven’t tested other wheels it’s likely many wheel and roller options will work for the intakes.

We should have some, I don’t think we have any pre-built brush rollers but that’s a cool idea, if we get a chance to test we will post video.

Are you thinking a brush roller or instead like a car wash side spinning brushes (picture)?

The other thing to consider is the extension limit. A lot of the 16ins get taken up quickly with bumpers and a 9.5in ball even when you compress it. So it may be the brushed roller is above your main intake roller to knock down balls but not very far in front.

Wondering if one of these would work as well? Haven’t played with them before but maybe at a low durometer they’d function the same.


Something like this:

You can mount brush strips to a 1x1 and rotate the 1x1, idea stolen from 3476’s 2020 bot:


2022 Day 3

The first day of the season with a normal after-school meeting is mostly just a recap of the weekend and discussing various strategy ideas and the road map to each of our mechanisms.

We planned how we would group the various mechanisms on the robot.

As well as how each of those mechanisms mounts to, supports, interacts with, and avoids the other mechanisms on the robot.

We can start allocating some space in the robot as the mechanism designs become clearer.

Much of that will depend on the requirements of our climber; the other mechanism can largely be designed around things and still function well. Since the climber has strict dimensions to get from bar to bar, it will get some amount of priority to space.

We have also begun building our team version of the high hub and will begin the hangar this week.

  • Spectrum

The day 2 and 3 blog links work fine, thanks!