A while ago we stopped posting our design process, but now we are ready to reveal it all. This is the 4886A robot which has won three competitions and qualified for worlds. The most that we got in driver skills was 155, a score we intend to improve.
(some of these are older and have a four bar and no flipper)
Holonomic X-drive (four 393 motors high torque)
6-bar lift geared 1:15 for torque (two torque 393s and two 269s)
Intake roller geared 1:3 for torque and tank tread table geared 1:1 (one torque 393 on each)
High goal scoring, string powered flipper
The intake works well, especially for descoring into the table.
Our max capacity was about 20 sacks, usually only lifting about 15. The compound gears skip/brake before the motors stall.
My robot has in its entire life intaked 3 sacks and they didn’t have anywhere to go. Point is my robot isn’t done but when I finish I will try to convince my team to do a reveal because we only reveal if unanimous vote.
Or more likely I said it to mess with someone without actually having accomplished it which I do in the skype chat a lot and might have done to mess with someone on the forum. I don’t remember doing that though.
As you can see in this thread, I believe capacity is more important than speed, so that is what we had in mind when we designed this robot. However, we think it is possible to speed up our robot while maintaining its capacity, so that is what we are working on now.
Sounds very sketchy. I’ve seen at least 12 on a 4 motor 1:5, so 20 on a 4 motor 1:7 is possible but maybe a little ambitious. Lifting 20 on a 9:1 ratio with only 2 motors? Not a chance. All my experiences are using an ~18 inch arm, mind you, so with a shorter arm it would be possible.
OT: Nice robot Rob and Owen :D. Can’t wait to see the improvement you’re going to make. I really like the method of scoring driver control loads on the high goal.