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-   -   The Robonauts 118 - 2014 Video (http://www.chiefdelphi.com/forums/showthread.php?t=126829)

eddie12390 21-02-2014 09:18
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Lil' Lavery (Post 1347419)
I question if that's why they have the drop down omnis, and if that would even achieve what you think it would. Spinning up the drive motors with almost no load on them is not going to help their acceleration much (if any) once the full load of the robot is suddenly placed on them.
This was tested on Mythbusters once and I recall them saying that "hitting the ground running" doesn't help. (At least not significantly)

Botwoon 21-02-2014 09:44
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by bEdhEd (Post 1346481)
I wish i though of lifting up the robot to get the drive wheels up to speed before touching the floor again to increase the rate of acceleration. I may have to consider doing this for future seasons, and it could work well for defense evasion.
I don't think that they intend for all four to be deployed at any time. Simply dropping two would make you much more slippery in terms of escaping pinning. I'm also quite sure that they are what are making those flashy 'handbrake turns' possible.

coalhot 21-02-2014 11:04
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Lil' Lavery (Post 1347419)
I question if that's why they have the drop down omnis, and if that would even achieve what you think it would. Spinning up the drive motors with almost no load on them is not going to help their acceleration much (if any) once the full load of the robot is suddenly placed on them.
It seems like they wanted to be able to do turns and drifts with a drivetrain that looks like a 8WD no drop. You can do some nifty things by popping down the front two or back two as you turn. I think the spinning up the wheels and dropping the bot was just to show off. :D

(just from my observations from the video. I see more every time I watch it)

AlecMataloni 21-02-2014 12:05
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by coalhot (Post 1347492)
It seems like they wanted to be able to do turns and drifts with a drivetrain that looks like a 8WD no drop. You can do some nifty things by popping down the front two or back two as you turn. I think the spinning up the wheels and dropping the bot was just to show off. :D

(just from my observations from the video. I see more every time I watch it)
There's definitely drop on the wheels from what I see, as the robot rocks back and forth at the end of their little "spin up the wheels while off the ground" maneuver. Also, without drop that robot wouldn't be able to turn at all in that configuration (8wd, centered COM).

I think you're correct to say that the omnis are there for neat driving tricks, though. It's similar to the driving that 148 showed off in their 2011 video with their butterfly drive.

mplanchard 21-02-2014 13:06
Re: The Robonauts 118 - 2014 Video
 
Great video. Great robots. Great song. Marie

george.tan 21-02-2014 16:30
Re: The Robonauts 118 - 2014 Video
 
Impressive machine!

magnets 21-02-2014 20:33
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Navid Shafa (Post 1347408)
Can't wait until they release CAD so I can figure out how the whole shooter and cocking assembly works.
It looks like a lead screw to me.

Navid Shafa 21-02-2014 20:40
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by magnets (Post 1347824)
It looks like a lead screw to me.
I think so too, but I think there is a lot more to it than just a lead screw. That's the part I'd like to figure out :)

R.C. 22-02-2014 00:47
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by MichaelBick (Post 1347412)
Doesn't look like it. The wheels they used were smaller and had 4 red rollers
They are 2" omni's!

Joohoo 22-02-2014 09:30
Re: The Robonauts 118 - 2014 Video
 
Well it looks like YouTube blocked it for copyright reasons.

Cory 22-02-2014 13:02
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Joohoo (Post 1347936)
Well it looks like YouTube blocked it for copyright reasons.
Only on mobile devices.

Mike Marandola 02-05-2014 00:23
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by MichaelBick (Post 1347398)
Did you purchase the mini omnis? If you did would you mind posting a link for them.
I believe they are 40 mm Dagu omnis

http://www.robotshop.com/en/dagu-omni-wheel-40mm.html

Canon reeves 02-05-2014 14:48
Re: The Robonauts 118 - 2014 Video
 
One cool thing I noticed about their 2" omni wheels seemed to be very useful when someone tried to t-bone them? I thought that was really cool and useful.

Mike Marandola 02-05-2014 15:54
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Canon reeves (Post 1382015)
One cool thing I noticed about their 2" omni wheels seemed to be very useful when someone tried to t-bone them? I thought that was really cool and useful.
And those slick 180s

rnewendyke 03-05-2014 01:59
Re: The Robonauts 118 - 2014 Video
 
Quote:
Originally Posted by Mike Marandola (Post 1381748)
I believe they are 40 mm Dagu omnis

http://www.robotshop.com/en/dagu-omni-wheel-40mm.html
They are either those or these. I'm not seeing a rating on the Dagu's, but the Rotacoaster is rated at 30 kg a wheel.


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