Re: Help out rookie/less experienced teams
 

I've yet to get around to putting it into Sketchup or anything. Blake left some dimensions missing (no big deal, it's a 1:1 blueprint after all), so I'll find my tape measure then mark those in.

That, and I'm not used to CADding things, so chill out a little bit. It'll get done. Maybe not today, but it will.

Re: Help out rookie/less experienced teams
 

Doodeelaadoo...

Click it. It's a thumbnail.


I'm still working on it, but I suggest that if you're going to want to maniuplate it and view it, you'll want Google sketchup. It's free (well, the free version is).

This is just a teaser, btw. I'll upload the .sku (or whatever the filetype is) when I finish.

Re: Help out rookie/less experienced teams
 

Talk to whoever does firstbase on your team and download a 30 day inventor trial.

that will give you plenty of time to learn inventor well enough to make your base. (2-3 hrs is all it should take)

Re: Help out rookie/less experienced teams
 

Eh.

I'm on the Manufacturing team, and I don't really have any desire to become a good CADder. Just well enough to do some simple stuff on free platforms.

Besides, I odn't even know if my team has an animator. D=

I have the basic frame CADded out. I plan on uploading the .skb once I get to the computer it's actually on.

Re: Help out rookie/less experienced teams
 

For between the side rails, instead of one huge piece of angle, use u channel or a cut piece of box tubing. This way for the inner piece you have support from both sides. Or just weld 2 pieces of inderstrial angle, so that you have the corner support. Or tig wil the inside corners of the channel.

Also I don't know if you plan on including it or if you even care, but for attaching the angle, just make tapped holes this way you dont need nuts. And 1/4-20 screws should suffice. If you do a 2 pattern, it should be fine:Doing a 3 hole pattern should stop rocking if you only have the support on on side:-John

Re: Help out rookie/less experienced teams
 

The bolts are all in the 3-bolt pattern you showed.


What I am showing is 675's chassis design for this year -- sans fasteners (if people really want to replicate it, they can improvise).


We have supports for the middle, but we don't use them. The strength given by the wheel axles and driveshafts (with bearing plates on the outside of the chassis securly fastened) is more than sufficient.


Trust me... It's a tested platform. This chassis design has seen 3 competitions without failure (and it's dished out and received some good hits).

Re: Help out rookie/less experienced teams
 

Our official rookie year was 2004, but because 90% of our team were newcomers and the rest had senioritis, 2006 became our unofficial rookie year. Our drivetrain was built badly. Because of how we built it, we had to slow it down or it wouldn't turn. At the Portland Regional, we had the slowest robot on the feild but by the end of qualifying we somehow got 1st seed. Our robot was mostly made to do 3 things: score autonomously, push, and get on the ramp. First thing into finals, our drive train finally caught up to us and our opponents didn't let us do any of those things.

What i'm trying to say is that a "bad"(slow) drivetrain can have upsides such as accuracy in autonomous or torque, but any good team can and will take advantage of it.

(you can't push something you can't catch)

Re: Help out rookie/less experienced teams
 

I figured that I would bump this thread, with all the new teams that are probably going to be joining FIRST this year. Who knows, maybe our (so far) combined knowledge will do some good! If anybody else wants to add to what's already here, don't hesitate.

Re: Help out rookie/less experienced teams
 

although.. we may not be an experienced team and I may not be experienced at autodesk I did over the summer make some general frames for basic wheel deisgns (4 wheel drive, omni drive etc) so I will try to post them when I get home (I'm at school right now lol)

Re: Help out rookie/less experienced teams
 

Two people suggested it, so I just edited the first post a bit and uploaded it.

The whitepaper, that is. Go ahead and check it out.

http://www.chiefdelphi.com/media/papers/2023

Re: Help out rookie/less experienced teams
 

I think you should add a few sections;

Gearboxes/Transmissions. List the common off the shelf gearboxes along with the pros and cons.

Also, maybe suggest different frame materials. Plate isn't the best material to use on it's own, and may be difficult to get all the dimensions required. Recommend 80/20 extrusion and maybe even aluminum extrusion.

But, if this truly is for rookies, I would stress that they stick with the KOP frame. The current iteration of the KOP frame is pretty awesome and easy to work with. What will make a bigger impact on rookies is using better gearboxes/wheels.

Re: Help out rookie/less experienced teams
 

Hi I'm a new student in a robotics class in Arroyo Grande and i'm rather new to robotics but the team is thinking of possibly using the BaneBot 56mm Planetary Gearbox and I was wondering if there are any bugs with this system or problems that we might need to be aware of currently. I saw that there were some bugs last year though I've been informaed those have been resolved, are any of these bugs still present or have any new ones arose? The BaneBot aside, is there a better gearbox that anyone knows about that's possibly cheaper or at least under 100$? If someone could message me with details (I assume there's a messaging system on this site) it would be much appriciated. I'll also be looking back to this thread regularly to check up on it, thank you.

Re: Help out rookie/less experienced teams
 

The AndyMark single speed is far superior to the banebots in performance/reliability (strength safety factor), weight, cost, efficiency etc.... It can also take both a big and small CIM, or two small CIMs with no modifications.

The banebots will work if used right, but there are far better solutions.

Re: Help out rookie/less experienced teams
 

Just as a note, the AM Gearbox has a smidge more gear reduction than the standard BaneBots 56mm gearbox (12.75:1 versus 12:1). You'll have to run the math yourself to see how it affects your application.

Re: Help out rookie/less experienced teams
 

Ok then thanks for the information I'll look into the AM gearbox, it looks pretty nice. Now I have a new question, what wheel speed is the best? What are teams going with and what do you guys, personally, think is the optimal wheel speed to use?