Laying it all out there

[Team 4264]

Well, so far you guys have really busted our design bubble about the FP motors so I'm just going to lay it all out and see what you think. Let me remind you that we are the rookie rural school with absolutely no help. No mentors, no engineers, no clue, no time, and not enough students (4-6 regulars), but we are going to build a bot!
Picture a U shaped bot, open in front. 1 CIM motor (front wheel drive)on each side in front with front being straight upper arms of the U. Caster wheels from and old auto creeper in the rear corners so that it can spin freely and quickly. Our strategy is to use this U shaped spin action to control the balls around the floor better. Balls come in and are directed toward a bicycle wheel being slowly but constantly turning by use of one of the slow torquey motors. Not sure how yet... Balls are directed back, up, and over,the tire by use of carefully bent rows of conduit to bring it up to the top. From there, create some baseball pitching machine setup that many other teams are using with I guess, based on answers from my previous thread, FP motors to drive the pitching wheels, though they seem a bit wimpy.
Motor list
2 CIMs (drive)
1 long torque motor (bike wheel)
1 servo motor ( a gate before pitcher)
2 FP motors (pitching machine)

Probably no time to test. Maybe no time to wait on part orders. What is average ship time on our voucher vendors?
Thats it. NO Kinect, no air system, no defender bot, and mostly junk from the shop.

PS.
Legend tells of a bot from rookies of the past brought in with no programming to compete yet the kind competitors swooped in and saved the day by programming it before the event. So legally (bag /tag rules) how is this possible at a regional event with lots of new rookie TN teams trying figure out what is going on?

[VKP]

I think it would be beneficial for you to use four CIM motors, and instead of using casters, I would use omni-wheels, which can be driven, unlike casters.

If you had casters and only two CIMs, you would be pushed around the field very easily. Omniwheels and two more CIMs on your drivetrain would help a little, while maintaining the turning capabilities you want.

A question though: why do you want to power the wheels on the "arms" of the U and leave the back of the robot to drag around? I'm assuming that with a U-shaped chassis, much of your weight will be at the back, so you will want powered wheels closer to your center of gravity so you can turn faster.

[MrForbes]

You should buy two more CIM motors and use them in the drivetrain, and also don't use casters, they make your robot pretty hard to control. If you want to collect balls in the U opening, it should be as wide as possible, to make it relatively easy to do, that means you want a "wide" robot. A 4 wheel skid steer "wide" robot drives pretty well, it can turn easily. But it is kind of "tippy" front to back, so you'd need to keep the weight centered down low, and it sounds like your ball lifting idea would end up being kind of heavy up high on the robot.

You might see if you could use a roller to help collect balls, and a single belt to lift them (see videos by falconmaster on youtube).

You can probably get by with a single motor/wheel shooter, have the ball go over the wheel, that will give it backspin and make it more likely to land in the basket. One FP motor is sufficient, and you probably want a single stage of gear reduction...see if you can modify the plastic FP gearbox to do this. We've done it by just using the first plastic gear stuck in a box we made ourselves, but without some machining help it would be pretty difficult. See if you can find any kind of machine shop that might help you

[Alex.q]

Originally Posted by squirrel

You can probably get by with a single motor/wheel shooter, have the ball go over the wheel, that will give it backspin and make it more likely to land in the basket. One FP motor is sufficient, and you probably want a single stage of gear reduction...see if you can modify the plastic FP gearbox to do this. We've done it by just using the first plastic gear stuck in a box we made ourselves, but without some machining help it would be pretty difficult. See if you can find any kind of machine shop that might help you

We are considering using the plastic FP gearbox (for our collector) because one of our mentors thinks it will be easy to connect to PVC. Did you actually use the gearbox or did you just cannabalize it for the gears, and if you actually used, could you give me some feedback on how to interface into the gearbox's input and output? (or alternatively tell me that if its a bad idea)

[SteveGPage]

One concern I would have, when I hear "U shaped" robot, is the requirement to have the chasis still able to meet the bumper requirements. Assuming you have an opening in front of your robot, the front of each of the "arms" still need to be at least 8 inches wide for the bumpers.

As for "no mentors" etc... I commend you for your efforts of doing what you can. Our team has helped several rural teams in the past via email and/or skype sessions. If you would like to have some mentors advise you long-distance in the following areas: electrical, command and control (programming), CADD, mechanical, arm and end, chasis, drive train, Chairman's, or PR - let me know and I'll gladly schedule time for you to talk to any and all of them. We are happy to help in any way we can!

[Akash Rastogi]

Just focus on scoring middle of the pack and do it consistently. Play a little defense, and you will have a good time.

Also, post up here for help whenever you need something or PM specific questions.

[PayneTrain]

I think a good low budget item for any team is 1-inch aluminum angle of a moderate thickness (like 1/8 ?). If you do all of your fab in-house like we do, you go through a lot of 1-inch angle. Find a welder or bolt it together, you can create a sturdy frame that will hold up to high impacts. this will also create a structure that will be low to the ground and house all of your electronics. With this, lexan, and a good roller/belt system ,you can create a decent conveyor as well.

Buy stock gearboxes for the lift and launcher where you can. Use kit wheels on the launcher. Do whatever you can. if you aren't experiencing success with the launcher, work towards building a robot capable of dropping the bridge and balancing on it. If you are building wide, you could be invaluable in small regionals.

It's not going to be easy, but if you're determined, you will go out there and build a robot, it will run, and you will never forget the process and the friends you have made for the rest of your life.

And you're a rookie with no experience going up against teams that have been around the block enough to notice the bricks on the front of every house. Don't just have fun, go up to the veterans and see what they do. Ask for help, even though it will find you if you need it.

Godspeed.

[SenorZ]

Ah, the rookie experience...

DO NOT put two powered wheels up front with casters in the back. We did that last year. It pivoted TOO easily. Attached is a pic.

We later moved the powered wheels to the center and put 4 casters on the corners. It would WAY better, but still squirrely.

PS: No mentors? Not even a teacher or parent? "/

[RoboDawg]

Hi,
First take a deep breath, and remember this is not just about building an robot. This about all your team, they are in this process to learn. I am a mentor of a team from a similar sized town in a rural part of Idaho. Our first year we were frantic and stressed and wondered if we were doing something out of our league. I know it's corny but---DON'T GIVE UP. Build what you can! Let your team know that it's okay to not build the the best robot. It's okay just to be a team trying to be it's best.

[fox46]

Oh the rookie year! I still remember mine
My rookie year in the FIRST competition was 2002 where we had to build a similar robot to collect foam balls and place them in a goal. We had a similar idea of a U-shaped robot that would collect the balls in a conveyor belt at the front and load them into a hopper which it would raise on a scissor lift and dump into the goal.... Of best laid plans

We ended up with a similar design to yours with a two-wheel and two-caster drive. It was slow as heck and that was the only reason it was controllable. Unfortunately since half or more of your weight is over two non-powered wheels, they are terrible in a shoving match. As far as collecting balls, the feeder mechanism would continuously jam up and once we got a few balls in the hopper, it didnt have enough power to lift. - It was a rough year but by far the most memorable! I remember thinking how overwelming the whole experience was and how "outgunned" we were by other teams. The next year however (using the same drivetrain setup too - not sure how that happened) we won the "driving tomorrow's technology award" which allowed us to attend the championship in Houston.

Try to take this year as a learning experience - a practice for next year. Learn as much as you can throughout the whole process and apply it next year. Write things down as you go so you can look back on your notes later.

Now - your robot. I would stay away from the Caster-wheel idea. Since your resources are limited, try to concentrate on doing one (simple) thing really well and consistently. I think you are on track with the U-shaped chassis. Look at the kit robot chassis and try to mimic its driveline. You have all the parts to build it right now with no machining skills needed. If you are going for a transverse drivetrain (long side of the robot facing forward), look at the kit bot design and "squish" it end to end, then leave the front side open to collect balls being careful to observe the bumper rules. Rather than building a throwing robot, try to make one that can collect balls and then bring them to the other side of the field. You are allianced with two other machines in a match and chances are that one of them will be able to shoot. You guys could be a huge help by just bringing them balls while they fire them in. If you want to be more ambitious, try to make a conveyor mechanism (taking note of the height restrictions etc) that can suck in three balls and then just drive up next to the fender by the nets and just pop the balls into the 2 point nets. If you can do this repeatedly and consistently you will have an even stronger machine. The most important thing in these competitions is to be reliable. Even if you have a very basic and simple machine, if you can score a few points a match and get on a ramp, you will be a strong competitor. These competitions are designed so that no one robot can do everything so being able to do one or two things really well rather than everything with mediocraty will make for a much better performance. Remember that in the finals, if you have a tiny robot that can collect 3 balls at a time, bring them to another robot and then be small enough to fit 3 robots on the ramp you will be VERY valuable as an alliance partner. Just by having a small robot that can drive around in the elimination rounds will score an alliance 20 points by getting all the machines on a ramp.

Just remember to have fun and learn as much as you can for next year!

FIRST competitions are like pancakes - the first one is always a disaster but at the end of the day it's still a tasty pancake and you've gotta eat it! mmmmmm.... pancakes

[mathking]

For picking up the ball, you can take a window motor with one of the hubs and screw the hub directly into a piece of PVC pipe. Put a cap on the other end and a shaft through it and you have a nice roller. Here is a pic of our 2006 bot (with was before we started using round urethane belting instead of conveyor belting, but this conveyor was the one part of the robot that always worked perfectly) which used this set up. Looking back at the BOM, the PVC, the belting and the hardware to mount all of this was $85.

[notmattlythgoe]

Are there any other teams around your area that you could contact to get some additional help? If there are I'm sure they'd be willing to give you guys a hand since you are lacking in the mentor area.

[fox46]

I just googled your location- there must be a team nearby, at least in Knoxville who can help you. Try soliciting local businesses for mentors- even in a rural area there are very knowledgable individuals who should be able to help: machine shops, autoshops, general contractors small engine repair, even hardware stores should have some knowlegable people who could help. Heck- farmers! If they know how to run a combine harvester then they should have LOTS of ideas for a ball harvester!

The two teams I mentor are 3 hrs away from each other, one - 2013 Cybergnomes, is in a very rural area and their main sponsor is JT's Snowmobile - http://jtsnowmobile.com/ which is a snowmobile and ATV shop. This one amazing shop whose building started life as a hay shed, provides more support than I have seen from multi-national corporations supplying teams with thousands of dollars and engineers to help them! Let alone, the quality, innovation and talent that comes out of their town of Stayner Ontario is mind-blowing as the Boston regional last year will attest to. Just because you aren't in a rural area doesn't mean there aren't knowledgable individuals and businesses who are willing to help in your midst. You guys have to get out there and find them and I bet they would love to help you- sometimes all it takes is asking.

[Siri]

Originally Posted by fox46

Just because you aren't in a rural area doesn't mean there aren't knowledgable individuals and businesses who are willing to help in your midst. You guys have to get out there and find them and I bet they would love to help you- sometimes all it takes is asking.

One of our Hall of Fame teams, Cybersonics (103), also runs a FIRST rural support network. I bet they'd also be happy to help you out in whatever ways they can. They're in Pennsylvania (a town 60% the size of yours, actually), but they're an amazing team in all aspects and have built up an astounding resource network and knowledgebase.

[Dancin103]

Originally Posted by Siri

One of our Hall of Fame teams, Cybersonics (103), also runs a FIRST rural support network. I bet they'd also be happy to help you out in whatever ways they can. They're in Pennsylvania (a town 60% the size of yours, actually), but they're an amazing team in all aspects and have built up an astounding resource network and knowledgebase.

Siri,

Thank you very much for all of your compliments. I will PM the team in need to see where we can help. To anyone in need of help in anyway, rural or non-rural, please let me know. FIRST is the hardest fun you will have and we are always willing to help.

Cassie