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-   -   pic: FRC488 - Octocanum Drive Rendering (http://www.chiefdelphi.com/forums/showthread.php?t=125519)

Madison 30-01-2014 20:03

pic: FRC488 - Octocanum Drive Rendering
 

ehfeinberg 30-01-2014 20:25

Re: pic: FRC488 - Octocanum Drive Rendering
 
Could you please explain your logic for having the three omni wheels in the center of the frame if you are already using mecanum wheels?

AllenGregoryIV 30-01-2014 20:29

Re: pic: FRC488 - Octocanum Drive Rendering
 
This is pretty awesome, do you catapult perpendicular to your traction wheels and collect from both the front and back?

z_beeblebrox 30-01-2014 20:35

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by ehfeinberg (Post 1335087)
Could you please explain your logic for having the three omni wheels in the center of the frame if you are already using mecanum wheels?

Follower wheels for distance and speed measurement?

Chris is me 30-01-2014 20:40

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by ehfeinberg (Post 1335087)
Could you please explain your logic for having the three omni wheels in the center of the frame if you are already using mecanum wheels?

Unpowered follower wheels allow the robot to know its true position and orientation at all times, regardless of slip in the drivetrain.

Beautiful drive base, and nice catcher? Excited to see the rest of it.

ehfeinberg 30-01-2014 20:48

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by Chris is me (Post 1335097)
Unpowered follower wheels allow the robot to know its true position and orientation at all times, regardless of slip in the drivetrain.

Oh that makes sense. So the 2 550 motors are not attached to the outside omni wheels?

Akash Rastogi 30-01-2014 20:57

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by ehfeinberg (Post 1335103)
Oh that makes sense. So the 2 550 motors are not attached to the outside omni wheels?

Looks like those might run the intakes?

AllenGregoryIV 30-01-2014 21:03

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by Akash Rastogi (Post 1335106)
Looks like those might run the intakes?

Those look like 4 775s to me but maybe those are 550s, and there is another VP up in the center that looks like it is powering a cho-cho double cam.

TheMadCADer 30-01-2014 22:45

Re: pic: FRC488 - Octocanum Drive Rendering
 
How long is the wheelbase for the traction wheels? Do you want to be able to turn on them, or is it intended to not be able to turn?

Madison 31-01-2014 00:53

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by ehfeinberg (Post 1335087)
Could you please explain your logic for having the three omni wheels in the center of the frame if you are already using mecanum wheels?

As others noted, we use the omniwheels as follow wheels to give us true on-field translation information and a gyro to track orientation. This makes our field-oriented drive work.

Quote:

Originally Posted by AllenGregoryIV (Post 1335088)
This is pretty awesome, do you catapult perpendicular to your traction wheels and collect from both the front and back?

Yes, that's exactly it.

Quote:

Originally Posted by AllenGregoryIV (Post 1335110)
Those look like 4 775s to me but maybe those are 550s, and there is another VP up in the center that looks like it is powering a cho-cho double cam.

Raising and lowering each of the intake systems is handled by 2 775 motors. The middle mechanism is the over-center linkage for cocking and releasing the catapult. People with think it's derivative, but I don't care -- I've wanted to use something like that for ages and we had to abandon our cool Geneva drive last season.

Quote:

Originally Posted by TheMadCADer (Post 1335158)
How long is the wheelbase for the traction wheels? Do you want to be able to turn on them, or is it intended to not be able to turn?

The wheelbase is about 14"; it's quite short and thus, we can turn on them. In our past experience, we did not spend a lot of time on the traction wheels. They're used for brief moments of added oomph and to resist sideways forces.

AlecMataloni 31-01-2014 01:11

Re: pic: FRC488 - Octocanum Drive Rendering
 
This is exactly the robot I would build if I were still competing. Awesome work!

AllenGregoryIV 31-01-2014 01:15

Re: pic: FRC488 - Octocanum Drive Rendering
 
Can everyone post teasers that are like this, you are actually able to decode what a team is doing from it.

Michael Corsetto 31-01-2014 02:35

Re: pic: FRC488 - Octocanum Drive Rendering
 
Quote:

Originally Posted by AllenGregoryIV (Post 1335223)
Can everyone post teasers that are like this, you are actually able to decode what a team is doing from it.

Agreed, this robot looks like an incredible machine. Very elegant and low low low :)

-Mike

Mark Sheridan 31-01-2014 11:56

Re: pic: FRC488 - Octocanum Drive Rendering
 
Very cool. Where did you get those follower omni wheels from?

XaulZan11 31-01-2014 12:23

Re: pic: FRC488 - Octocanum Drive Rendering
 
Do you need both intake arms down to shoot or do you have enough clearance?


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