![]() |
pic: 6 Wheel Drivetrain
|
Re: pic: 6 Wheel Drivetrain
Before anyone flips about the pocketing on this...
Note that this is for sponsored robots, not for competition use. IE: t shirt launchers |
Re: pic: 6 Wheel Drivetrain
Looks like fun.
Even with it not being a competition robot, I'd still be a little worried on the pocketing. Would having a little less of it be out of question? -Nick |
Re: pic: 6 Wheel Drivetrain
Quote:
|
Re: pic: 6 Wheel Drivetrain
The fact that it's not for comp is even more reason not to pocket it.
Just leave the 1/4" plate solid, it'll be stronger, prettier, and waaaaaaaaaaay quicker to manufacture. It will also make the base more stable for whatever it's being used for. |
Re: pic: 6 Wheel Drivetrain
6 wheel drive and all that pocketing seems like a lot of work for a non-competition robot.
|
Re: pic: 6 Wheel Drivetrain
Quote:
I do agree that the holes for the wheels need more beef. It is .5" width now, I should have put it as .75" width. The rest of it is identical to the plate we used for our 2009 bot. Its just a foot longer. |
Re: pic: 6 Wheel Drivetrain
Quote:
Thanks |
Re: pic: 6 Wheel Drivetrain
Quote:
Also on CAM programs, pocketing is an option for type of toolpath. -RC |
Re: pic: 6 Wheel Drivetrain
Maybe higher ground clearance. If its noncompetition, I can see it going around sidewalks, pavements and grassy areas.
|
Re: pic: 6 Wheel Drivetrain
You plan on using 25-series chain to drive the omnis...how will you tension the chains? Also make sure the alignment between each pair of sprockets is acurate.
With 8" wheels and a 5"-wide plate (assuming wheel centers are in the center of the plate--at least it looks that way) gives you a 1.5" ground clearance? Should be OK. I have to agree with others that you need more meat on the side plates...1" on the webs at least, and big radii in the corners of the pockets. Always start with a strong base, even if it's not for competition. 80/20 is good stuff, but you have to watch that the bolts holding the frame together don't come loose--they always seem to eventually. If you're not going to take it apart, you may want to consider Lok-tite (or tack welds). All that said, it looks like a solid, simple design that should go together very quickly. |
Re: pic: 6 Wheel Drivetrain
I would be concerned with the front and rear driven omni-wheels. In our experience, having no side-force resistance to turning will lead to a robot that is very difficult to accelerate in a straight line.
|
Re: pic: 6 Wheel Drivetrain
It appears as though you are using AM toughboxes, you might want to leave the cover over the gears to keep dirt and FOD out of the gears and grease.
|
Re: pic: 6 Wheel Drivetrain
Quote:
|
Re: pic: 6 Wheel Drivetrain
I'm still a little confused as to why this chassis is being built with weight in mind (other than to keep it liftable, roughly under 150ish pounds), but it looks simple and effective.
|
Re: pic: 6 Wheel Drivetrain
Quote:
Quote:
Quote:
Quote:
Thank you for all for your input Bryan Gallo |
Re: pic: 6 Wheel Drivetrain
I'd recommend ditching the wedgetop tead and omni wheels for normal solid rubber wheels like colsons.
They're cheaper, and won't need replacing/maintenance. |
Re: pic: 6 Wheel Drivetrain
Bryan,
Nice work. I am trying to get my class to evaluate different disigns with different materials. Could i get a copy of the CAD file? It would help with the analysis. |
Re: pic: 6 Wheel Drivetrain
Quote:
http://team1323.com/cad/pages/teamhosting.html If you would like to check these out, Bryan has 5 of his bots on there. -RC |
Re: pic: 6 Wheel Drivetrain
Yeah! there are 5 up there. 2006-2009 are very durable tank drive drivetrain systems. They've been through pretty harsh competitions, and worse yet, off-season, and they've lasted through that. If you have any questions about any of those designs i'll be more than happy to help. PM me or email me.
I'll try to post more drivetrains on the team hosting website. I have a few on here, along with our T Shirt Shooting Robot the Screamin' Eagle! I just need to finish up some work on it. |
Re: pic: 6 Wheel Drivetrain
Nice work.
Consider making the thin strips that lead from the edges to the wheel axles a bit thicker, perhaps like a filled-in "X" or hourglass shape instead of an "I". We used a similar system of 80/20 in 2009 and it worked out very well. I also like the concept of using the strength and stiffness of the bumpers as a structural element. Some spots for mounting them would be wise. |
Re: pic: 6 Wheel Drivetrain
Looks cool
We used a similar design for Overdrive in fact we used the same middle wheels it worked out well it would be great for contacts We are working on somethig for contacts as well |
Re: pic: 6 Wheel Drivetrain
You mentioned cheerleaders lifting it, who's going to be driving it? 8" wheels direct driven from a toughbox is about 14 feet per second. It takes a lot of practice to be able to control a robot at that speed. That doesn't seem wise for a demo robot that is either being driven by inexperienced drivers or driven around people.
|
Re: pic: 6 Wheel Drivetrain
Quote:
|
Re: pic: 6 Wheel Drivetrain
Quote:
If you layout your sprockets and chain flat on a table you can get the dimensions center to center of the axels and you will not need tensioners. We did this on our test bot and it worked pritty good. |
Re: pic: 6 Wheel Drivetrain
A robot only really needs a few motors. You could swervedrive it or use tank steering, where you have two motors, one on each side, and them power three wheels on each side if you wanted that many.
|
| All times are GMT -5. The time now is 00:20. |
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi