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  #16   Spotlight this post!  
Unread 27-07-2015, 20:34
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Re: pic: Duodec-Drive (Octocanum)

The CAD for the module has been available for download on http://www.teamneutrino.org/seasons/...bot/butterfly/. You can see how the module works pretty well from it.
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Unread 28-07-2015, 09:46
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Re: pic: Duodec-Drive (Octocanum)

Quote:
Originally Posted by Aren_Hill View Post
The piston shown is a 1-1/16" bore pancake piston from Automation direct, 1" stroke. It pushes directly down on a 3/8" steel standoff between the two sideplates of the module, and is not connected in any other way.

The module was spring return default to traction mode by a spring (not shown) attached to the small tab you can see behind the omni.
Pop the spring off and pull a single bolt and you could pull the module out.
Mind blown.

I had only ever viewed butterfly & octocanum drives as a curiosity, but now I'll have to reconsider!
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Unread 28-07-2015, 11:35
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Re: pic: Duodec-Drive (Octocanum)

Quote:
Originally Posted by Aren_Hill View Post
The piston shown is a 1-1/16" bore pancake piston from Automation direct, 1" stroke. It pushes directly down on a 3/8" steel standoff between the two sideplates of the module, and is not connected in any other way.

The module was spring return default to traction mode by a spring (not shown) attached to the small tab you can see behind the omni.
Pop the spring off and pull a single bolt and you could pull the module out.

Any questions about it just let me know.

-Aren
That is an amazing design! We might be stealing this for next year
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Unread 28-07-2015, 12:00
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Re: pic: Duodec-Drive (Octocanum)

I would recommend pivoting on the traction wheel unless you have some serious side support. (See Aren's image where the module is snug between the channel.) We had a lot of problems on the 2010 148 drive with this. Your traction wheels will stay put, but the modules will flex sideways under sideloads. We used chains and had issues with them coming off. May not be such a big deal with belts, though.
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  #20   Spotlight this post!  
Unread 28-07-2015, 23:23
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Re: pic: Duodec-Drive (Octocanum)

Quote:
Originally Posted by ParkerF View Post
I would recommend pivoting on the traction wheel unless you have some serious side support. (See Aren's image where the module is snug between the channel.) We had a lot of problems on the 2010 148 drive with this. Your traction wheels will stay put, but the modules will flex sideways under sideloads. We used chains and had issues with them coming off. May not be such a big deal with belts, though.
To elaborate on this, the sideplates of this module were .125" thick steel plate, and there were also two pieces of adhesive backed HDPE between the module side plates and the inside tube faces to send the forces straight into the 3x3 tube.

The main reason I chose to pivot on the omni wheel was to keep the CIM hard mounted, rather than swinging with the module (single stage of gearing to the omni wheel).

-Aren
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