31-10-2014 16:11

Nemo

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

I like the synergy between a swerve drive like this and an 8 sided frame. Maybe I've said that before, but that extra length and width is a nice side benefit of your other efforts. What's the outer length and width of this frame?

01-11-2014 00:56

asid61

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

What's the weight as shown in this picture (4 swerves and the chassis).

05-11-2014 14:14

Kevin Ainsworth

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

29.625" square
We optimized for 2013 for a single large wheel shooter we ended up not using and it helped in 2014 for the large ball

38 pounds + fasteners not added to the cad file
Should be pretty accurate, all parts have correct materials.

05-11-2014 14:27

Henrique Schmit

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

I've seen teams who use swerve using their corners to hit other robots' corners and flip them in order to defend. Do you think your octagonal frame is going to be able to still do something like that?

05-11-2014 15:35

Alan Anderson

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

Is "flip" really the word you want to use, or would you like to choose another?

05-11-2014 17:30

Kevin Ainsworth

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

It doesn't look like you have ever played at a competition with us so I don't understand your very specific question.
Did you have a bad experience this year with a octagonal robot?
We do not condone or encourage our drivers to be aggressive.
The octagonal frame does nothing to "flip" robots that I know of.
It's benefit is it maximizes area and wheelbase for a given perimeter.
It also rolls off another robot easier when they are trying to push you.
The question is, should a team be penalized when they build their robot with a low center of gravity and another robot that is top heavy gets flipped accidently?

05-11-2014 20:09

asid61

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

I think that Henrique means to spin, more like. Hitting a corner would give the maximum lever arm.

05-11-2014 20:16

Abhishek R

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

Yes, I think he was referring more to a "spin," rather than a flip.

Does the octagonal frame give you greater ability to spin out when being pushed? I'd imagine it does.

This really looks amazing.

05-11-2014 20:44

asid61

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

With bumpers? That sounds a little low including the bumpers.

06-11-2014 10:26

Kevin Ainsworth

Re: pic: Coaxial Swerve Drive Module with 2-speed Ball Drive and Nitrile Tread

Henrique, my apologies for misinterpreting your comment. The octagonal frame is more offensive than defensive. It is for getting out of a pushing match. You are correct, It would be harder to spin another robot with the octagonal frame. Really the design comes from maximizing the area of the robot for game pieces and mechanism.

Without bumpers the weight is 38 lbs.
Since bumpers don't count towards robot weight we set their cad files to zero pounds.