What is the best expansion for endgame. Iām thinking of having wrapped rope or a chain on a spindal, unraveling it and driving away. The problem is as mentioned by many others in this tread, the other team could easily block the robot.
Itās twice as difficult to block two endgame mechanismsā¦
I would suggest looking at 4082Bās endgame. I really like the simplicity and reliability of it.
I was thinking of just using a conveyor for my intake system, is there any plausibility in that?
Yes. Take a look at Spin Up matches and reveals on youtube to see what other teams have done.
Possibly, its best if you test out different types of intake mechanisms and documenting it in your teamās engineering notebook. Note that just because a certain mechanism works for one team does not necessarily mean it will work for your team.
Can you build a string catapult without using any pneumatics or shaved gears?
Yes, so the concept of a string cannon is to store elastic potential energy in a secure mechanism during the first 1:50 of the match.
At the end, you would need to release this elastic energy so it could launch a payload. Think about some possible methods to release it!
Without the convenience of pneumatics, one possible solution would to use a ratchet from a motor on another subsystem (say intake) to connect it to a release mechanism. This could be ranging from a trapdoor to a winch and pulley pulling out a pin, releasing the catapult.
These are only a few solutions that could be implemented without pneumatics or a slip gear, but be creative! The possibilities are endless.
Feed the string into a flywheel (the main flywheel if you are doing one)
if you feed the string into the flywheel, wouldnāt it get in the way of the disks?
What I meant is to have it go into the flywheel mechanism after you are done making your last shots.
Example
Having the string be dropped from above onto the flywheel indexer (one end of the string still attached to the robot).
so what is the screws supposed to do then
The screws are supposed to act as a hook for the latex tubing (look at drawing in my previous post)
I think benn gave you some pretty good ideas. Without pneumatics or free motors, a ratchet seems like your best option. Lots of examples on youtube.
Is string legal for endgame expansion? I think it is but not sure
Give the game manual a read. I will tell you what is and isnāt legal.
https://content.vexrobotics.com/docs/2022-2023/vrc-spin-up/VRC-SpinUp-GameManual-2.0.pdf
Just reread the horizontal expansion section, there isnāt anything on string. (meaning it isnāt explicitly stated that itās illegal, but it also doesnāt say it is legal)
In that case, anything this is not explicitly stated as illegal is legal. (Queue lecture about purpose of game manual by kmmohn). In the future, please check the search bar for the many threads about your exact question. Finally, you will be looking at the sections about what materials are legal, not the horizontal expansion section for the answer to your question. Refer to rule R7. Also command + f or control + f will be useful in finding anything related to āstringā.
For any question about the legality of something, we must turn to the game manual (or the Official Q&A). As you read the game manual (https://link.vex.com/docs/2022-2023/vrc-spin-up/GameManual ), keep in mind that the game manual tells you things that you must do, and things that you are prohibited from doing. It canāt tell you everything you might do, so if the game manual does not prohibit an action, then it is generally legal. The game manual does not generally discuss any particular game strategy or mechanisms you might use.