1726 Beginning Week Three

[GUI]

We're doing pretty well so far, we almost have the beta version of our robot built. All that needs to be made now to have a complete prototype bot is the part to move the balls from the floor to the top, which is mostly designed and should be done in the next few days, as well as some wire management and mounting of the electronics. Our robot as currently planned has a turreted shooter, which is loaded by a helix hopper and a roller on the floor. This all mounts on a wide format four wheel drive chassis.

http://www.youtube.com/watch?v=qNH4hb7crFU

Any comments or questions are greatly appreciated!

[Andy L]

We're having some trouble getting a good way to rotate. Can you explain how yours does?

[MrForbes]

We are posting photos of our build too.

http://photos.project1726.org/thumbnails.php?album=34

(this might answer your question about how it rotates)

[CCCP]

here is a up close image http://photos.project1726.org/displa...up&cat=0&pos=3
and here is the video of the pully system http://www.youtube.com/watch?v=50Q3ToSvbIg

[shawn1231]

What are you going to have feeding the balls into that shooter during competition? Are you using an auger? If so what is going keep the balls from shooting when you don't want them to?

[MrForbes]

We are planning on using a helical path for the balls to follow upwards, with a center rotating part to drive them around and up the path. At the top will be another small roller that will pop them into the shooter. We need to get this all built and see how it works. We might need to make a gate to control the balls at the top.

[CCCP]

this is how we are feeding thje balls to the turret http://www.youtube.com/watch?v=LlUgVpRckS8

[Andy L]

Wow, quick good responses, thanks.

[hipsterjr]

Awesome work guys. I have always admired your team.

[Vikesrock]

Great work! It is awesome to see a proof of concept that a design like this can be done with simple components and fairly simple tools (from the looks of things).

We will be attempting a similar setup that we will begin working on shortly.

Judging from the pictures it looks like the was (or at least could be) done with basic wood working tools such as a jigsaw, table saw and a drill. Is that accurate?

[MrForbes]

Well...it maybe could...but we did use the lathe for some parts, like making the bearing holes in the roller end caps, and making shaft size adapters for the sprockets onto the transmission and motor shafts, and the output shaft for the Fisher Price little gearbox we made.

I think everything except that output shaft could be made without the lathe, if you were good at drilling holes into round things, and getting them properly centered.

[shawn1231]

I looked at the pictures which I greatly appreciate. And also thanks for the quick reply, but I'm still a little fuzzy. I can tell how it all goes together but what did you use to make it rotate. I mean what is that part exactly? Or is it custom? I really appreciate the video and pictures, our team is trying the same thing and I marvel at how quickly yours went together, we're still stuck in auger land, but we're quickly moving to the shooter. Just curious, why did you choose the one sided shooter like that? We had been looking at two smaller rollers on either the sides or the top and bottom but this looks simpler. What made you go with form of shooter?

[Vikesrock]

Sorry, I should have specified what I was talking about. Of course it is much easier to use a lathe or mill for some of the shaft and bearing parts as close tolerances must be kept on those parts for the system to run well.

Provided we can CAD exactly what we need (and my CAD skills, while not great, should be sufficient) we do have access to a machinist that will assist us with small parts like the things you mentioned.

Once again, the pictures are awesome! It looks like you guys are making great progress. Now I just have to convince my team to be as transparent as you guys are (I guess we have to be taking pictures before we can be sharing them though...).

[MrForbes]

Originally Posted by shawn1231

I looked at the pictures which I greatly appreciate. And also thanks for the quick reply, but I'm still a little fuzzy. I can tell how it all goes together but what did you use to make it rotate. I mean what is that part exactly? Or is it custom?

It's a Southwest part...called a Swamp Cooler Blower Pulley. It's a 12" diameter, 1/2" V belt pulley, which happens to have nice flat spokes that are perfect for cutting off and bolting to a piece of plywood. The magic trick is using 3/8" belt on it, so there's an indent for the support bearings to ride in. (also we are going to put normal kit wheel bearings on it to replace the previous year KOP slide bearings)

Just curious, why did you choose the one sided shooter like that? We had been looking at two smaller rollers on either the sides or the top and bottom but this looks simpler. What made you go with form of shooter?

We tried it and it worked.

[MrForbes]

Originally Posted by Vikesrock

Now I just have to convince my team to be as transparent as you guys are

It's interesting how this works out. It could be that some teams will copy some of our ideas, which I think is great. It could be that some of these teams will do a better job with their copy, than we did with the original! which is also great, although it takes some hard thinking to figure out how to explain this to all the team members....but eventually it seems that we realize that there's an I in FIRST, and the I stands for Inspiration, not for "me".

Besides, when we goof up, we get quick feedback! ask 842 about that