I was planning on making a better version of my dual flywheel. My gear ration has a too big of a delay time and too much friction. Has anyone managed to make a good gear ratio for good accuracy and so it be able to shoot from the starting tile? Also, how many motors should i use? I would like to hear ideas. Thanks in advance
I have never conducted double flywheel tests, so I’m in no means an expert, but I’ve heard of 1:7 turbo gearing with 5 inch wheels mentioned many times, and I believe that would be suffice. (Wow, I used four clauses in a single sentence :P) 1:15 with high speed for 4 inch omnis may be good as well (IronWave’s Summer Reveal Thread, specifically Post #27).
Just remember: Less Gearing = Less Friction
Good accuracy comes with controlling the flywheel speeds using a PID controller. I think P would be enough, but as I have mentioned, I haven’t ran any tests with double flywheels.
I would say 4 motors because that makes for a quicker spin up time than 2 motors.
Can we have a photo of you flywheel? It would help in advice.
Anyway, here are some tips: USE BEARINGS (very important), I would suggest a 15:1 gear ratio with 4 high speed motors (look at our reveal on our YouTube, we are using 2 motors, it took 3 seconds to ramp up) 4 motors will ramp it up faster, use a solid structure to encase gears and wheels, use 4" omni-wheels (they have great traction).
These are all for a dual wheel flywheel, though you may want to try something else;).
Just some tips.
If you have 4 motors available use them! that would significantly improve your fire rate.
Personally I use 7:1 gear ratio with turbo motors, works very well, but is very important to reduce the friction as much as possible. Also I suggest to use vertical flywheel with a shooting angle of 45 and 5" traction wheels.
don’t forget the programming. PID control is the key of accuracy in this game
you can see my robots here https://vexforum.com/t/hybrid-robot-reveal-masters-colombia/30193/1
Thanks for the quick reply! I have 6 motors available since we only have 2 in the base (we are testing this). And we were planning on putting both wheels in a combined gear ratio to remove the fact that one wheel could spin faster than the other. We had a 1-24.5 mechanism ( it was a mess, they were the only gears we had available) with 6 motors in torque. Any other suggestions?
we are using a 1:21 gear ratio, with speed motors, 4 of them. again echoing what has already been said: build a really good solid frame, use locknut and bearings, do everything you can to reduce friction. also we are using 5 in wheels.
again, P controlers, or a PID control is crucial
When you say PID control, what do you mean? How do i program this in a program such as easy C?
ok so PID control is quite complicated, but it essentialy finds the difference between how fast you want to be spinning, and how fast you are spinning now (as measured by sensors) and adjusts your motor power accordingly.
in terms of implementing it in easyC I really don’t know, I could send you my robotC code that does PID control if you would like.
a much easier, but still quite effective way to control velocity if a P controller, or proportional controller, which is just this
error = targetspeed - current speed
MotorPower = error * P
P is a proportional value that is experimentally determined.