Hi guys, our team have 4 meetings, about 7 hours to build a robot with a conveyor belt before our next competition. We completely took apart our old hero bot. We need help building a drivetrain and intake, and we are building this intake below. Anybody know how we can build a drivetrain and this will take in 7 hours? Our team only have 4 inch wheels. Any help appreciated.
From Catalogue of Drive Gearings - VEX V5 General Discussion / Technical Discussion - VEX Forum:
Blue cartridge (600rpm) motors power the blue gears. The blue and red gears are offset from each other by one row.
See the other 4" wheel drive gearings if you don’t like this one.
If you’re really in a hurry, 200rpm (green cartridge) motor direct drive to wheels. Last resort (although it’s literally what my team is doing b/c this is my first year). With 4", it’s approx. 42 in/sec.
All omni-wheels. (Unless you try putting 2 traction wheels in the middle; in that case, you’re relying on the sink of the omni-wheels into the mat because traction wheels are slightly smaller than omni-wheels.)
Obviously, you’ll have to change your code. Use motor groups. See VEXcode V5 API Reference Guide for help.
Of course, you don’t have to take my advice. Discuss with your team and make your own decisions.
Answering your second question about the intake, i would highly advise building a hood instead of a hook intake if youre in a time crunch. Hood usually requires less fine-tuning than a hook intake does. You can refer to other intake posts in this forum for more information.
Our team decided to switch to hood intake with flaps. Do you have an idea about scoring on the wall stakes with hood?
I would heavily consider the time you have left before trying to go for a wall staking mechanism. If you want my opinion, I would suggest using the extra time to create better match/skills auton, as well as driver practice.
But if you really want to build a wall stake mech, try a LadyBrown mech, as shown in the video attached. The loading mechanism would be where the hood usually is, as seen in the video.
Glad you enjoyed the video 
7 hours is not a lot of time. I would recommend keeping things very simple. 200RPM on 4 inch wheels is bad, but not terrible. I’d do it cause you don’t have much time and it does work.
Then you needs some way to score rings in the most basic way. Do not build a wall stake mech. It’s better to do one task well than multiple tasks all poorly.
In order to score rings, I would recommend a simple claw. Hooks and hood are both going to take considerably longer, and you have to worry about building a goal clamp, both things that take time. Given that you seem newer to vex, I doubt you would have time.
Keep it simple. Spend a bit of time practicing driving and ensure you at least have a basic auto. (Scoring 1 ring is ideal but at least make sure you can move off of the line)
This is my 2nd year. Our team decided to build this intake below that I designed on Onshape. It is inspired by the Spin Up hero bot and we are going to build the same drivetrain from that bot but upgrade it a little bit. We are using flaps for the intake. We decided that claw and the old hero bot (which we used 2 competitions) doesn’t score that fast.
We are probably not building a goal clamp because some teams in our region did really good without a clamp but if we want to build one, it’s probably going to be a direct 100rpm clamp which we will not raise the goal off the ground but it will at least let us control the mobile goal and will prevent other teams from stealing mobile goals which also prevent us from scoring. My teammates don’t like a claw because we took apart our old hero bot (plunger bot) and we need faster scoring since we keep getting rank 15/30. Here is the intake:
There have been some other teams around the vex forum trying out a motorized clamp. Ill look for it now and reply shortly with the link. I would advise to build your hood intake, but do not attach it to you robot yet. You want to see what distance the top of the goal will be when clamped then create your intake around that.
Is the hood intake from the picture I sent above good? Do I need to modify it?
