|
|
|
 Inspiration is created by a vision and is reinforced with success. - rourke [more] |
 |
|
|||||||
|
||||||||
Now that the Vex 4" mecanum wheels have arrived, we were able to assemble our octocanum pods tonight. Not shown is the CIM motor that attaches to the module and drives the 72 tooth gear on the mecanum wheel shaft.
Discussion
view entire thread
29-01-2014 06:44
Jimmy Nichols
Re: pic: FRC488 - 2014 Octocanum Pod - Top
how are you actuating the unit?
29-01-2014 11:40
Blackphantom91
Re: pic: FRC488 - 2014 Octocanum Pod - Top
These are really nice. I am assuming that you are actuating the entire pod due to the mounting holes. Cant wait to see it in action. Very nice work.
29-01-2014 11:47
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
The highlighted bracket is attached to a 1.5" bore, 1.5" stroke cylinder. There is one cylinder for each pod. It pushes on a 3/8" bolt that will be located on the right side of the pod shown above.
The pivot is on the far left of the pod, behind the mecanum wheel.
29-01-2014 15:44
magnets
Re: pic: FRC488 - 2014 Octocanum Pod - Top
This is really nice. In terms of design/simplicity, it's the best ocotocanum I've ever seen.
29-01-2014 15:51
AllenGregoryIV
Re: pic: FRC488 - 2014 Octocanum Pod - Top
Madison, out of curiosity what is your change in ground clearance from Mecanum to traction?
29-01-2014 16:01
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
There's about 1/2" of clearance.
30-01-2014 09:07
pfreivald
Re: pic: FRC488 - 2014 Octocanum Pod - Top
That looks delightfully compact and sleek!
Curious: Why did you go with 4" mecanum wheels? Is it just a weight/compactness issue? Our octocanum switches from 6" mecanum (with a .75" sprocket) to 2" colsons (with a 1 7/8" sprocket!) to get the lowest gear reduction possible without an additional shifter.
Also, are you actuating all four cylinders from a single valve? If so, how fast is the switch?
Thanks!
30-01-2014 12:19
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by pfreivald
That looks delightfully compact and sleek!
Curious: Why did you go with 4" mecanum wheels? Is it just a weight/compactness issue? Our octocanum switches from 6" mecanum (with a .75" sprocket) to 2" colsons (with a 1 7/8" sprocket!) to get the lowest gear reduction possible without an additional shifter. Also, are you actuating all four cylinders from a single valve? If so, how fast is the switch? Thanks! |
We haven't decided yet if we're going to actuate all four cylinders together through a single valve or give them each (or in pairs) a valve to increase air flow. We'll probably try it both ways and, if there's no really compelling reason for the added airflow, use a single valve.
30-01-2014 12:23
pfreivald
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Madison
It was entirely about making the modules as compact as possible. Not much additional thought went into the decision beyond that.
We haven't decided yet if we're going to actuate all four cylinders together through a single valve or give them each (or in pairs) a valve to increase air flow. We'll probably try it both ways and, if there's no really compelling reason for the added airflow, use a single valve. |
30-01-2014 12:29
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by pfreivald
Fair enough. May I ask what each pod weighs, with motors and wheels?
|
30-01-2014 12:37
pfreivald
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Madison
Solidworks says they're 5.75 lbs. each.
|
Thanks for sharing--it's always neat to see other teams' take on the same basic functionality.
30-01-2014 13:39
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by pfreivald
Okay, so you're about 1.5 lbs lighter than us, per pod, but (I think?) we have a greater gear reduction (7x) when switching to traction mode.
Thanks for sharing--it's always neat to see other teams' take on the same basic functionality. |
30-01-2014 13:45
Bryce2471
Re: pic: FRC488 - 2014 Octocanum Pod - Top
Very cool design, I hope to see it in competition.
| Solidworks says they're 5.75 lbs. each. |
30-01-2014 13:58
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Bryce2471
Very cool design, I hope to see it in competition.
Just curious, does that weight include the mounting bracket(s) and pneumatic cylinders? |
30-01-2014 14:24
Aren_Hill
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Madison
Solidworks says they're 5.75 lbs. each.
|
-Aren
30-01-2014 14:29
AdamHeard
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Aren_Hill
I'd be quite surprised if whats pictured is that heavy, my butterfly module from last year was 2.38lbs with very little effort in regards to weight. From the looks of it there isn't much more here.
-Aren |
It would have been insanely clean. If anyone hasn't seen Aren's butterfly (which we ripped off), it's hand downs the cleanest setup anyone has run by a huge margin. That's why we stole it
30-01-2014 14:32
Electronica1
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Aren_Hill
I'd be quite surprised if whats pictured is that heavy, my butterfly module from last year was 2.38lbs with very little effort in regards to weight. From the looks of it there isn't much more here.
-Aren |
30-01-2014 14:56
Madison
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Electronica1
I think that weight included motors (and the weight you listed is lighter than one cim so i know the weight you listed does not include a motor).
|
30-01-2014 15:14
wireties
Re: pic: FRC488 - 2014 Octocanum Pod - Top
It is interesting and instructive to see the evolution of your drive from year-to-year. It is clever and well done. Good luck this year!
30-01-2014 15:47
Bryce2471
Re: pic: FRC488 - 2014 Octocanum Pod - Top
I'm also curious why you decided to run your belt and gears on the same side of the mecanum wheel. It seems like if you ran the belt on the other side of the module, then your traction mode would have a wider wheel base and the cim shaft would take less side load. I'm sure you have good reasoning for why the module is made this way. I'm just curious to see what your thinking was.
30-01-2014 15:50
AllenGregoryIV
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by pfreivald
Okay, so you're about 1.5 lbs lighter than us, per pod, but (I think?) we have a greater gear reduction (7x) when switching to traction mode.
Thanks for sharing--it's always neat to see other teams' take on the same basic functionality. |
|
Originally Posted by Bryce2471
I'm also curious why you decided to run your belt and gears on the same side of the mecanum wheel. It seems like if you ran the belt on the other side of the module, then your traction mode would have a wider wheel base and the cim shaft would take less side load. I'm sure you have good reasoning for why the module is made this way. I'm just curious to see what your thinking was.
|
30-01-2014 15:50
Answer42
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by AdamHeard
We really wanted to run a octonum variant of this above module but it didn't match what we wanted to do with the game.
It would have been insanely clean. If anyone hasn't seen Aren's butterfly (which we ripped off), it's hand downs the cleanest setup anyone has run by a huge margin. That's why we stole it |
30-01-2014 15:53
AllenGregoryIV
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Answer42
Would you mind posting a pic of it? I'm curious now.
|
http://www.teamneutrino.org/seasons/...bot/butterfly/
Our octocanum modules this year were heavily inspired by team neutino's work.
30-01-2014 15:57
AdamHeard
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by AllenGregoryIV
They have a website with a really good description.
http://www.teamneutrino.org/seasons/...bot/butterfly/ Our octocanum modules this year were heavily inspired by team neutino's work. |
It's the lightest cleanest butterfly (that could be an octonum if hte tube was 4" wide) that anyone has done.
30-01-2014 16:10
Answer42
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by AdamHeard
This then nest in a single 2x3 (for us) or 3x3 (for them) tube which is also your frame. Real clean.
It's the lightest cleanest butterfly (that could be an octonum if hte tube was 4" wide) that anyone has done. |
30-01-2014 17:39
pfreivald
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by AllenGregoryIV
Why such a low gear reduction, seems like 488's will be traction limited.
|
30-01-2014 23:29
Trent B
Re: pic: FRC488 - 2014 Octocanum Pod - Top
|
Originally Posted by Aren_Hill
I'd be quite surprised if whats pictured is that heavy, my butterfly module from last year was 2.38lbs with very little effort in regards to weight. From the looks of it there isn't much more here.
-Aren |
31-01-2014 23:09
RobotDoktor
Re: pic: FRC488 - 2014 Octocanum Pod - Top
Nice. I really like how compact the modules are. Ours are a lot longer, but we have 6" mecanums and 4x2 Colsons.
view entire thread
Tags
loading ...