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Unread 25-03-2011, 09:55
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Re: Globe transmission with other motor(s)

Quote:
Originally Posted by s_forbes View Post
Very nice modification! It's great to see a planetary gearbox alternative that a lot of veteran teams already have laying around.

Seems a little blurry to me on the rules though this year... Is this considered modification of a COTS item? I didn't think that anyone sold these motor/gearboxes anymore.

R29 is a neat rule this year that allows use of past robot components and COTS items that aren't sold anymore, but gives the impression that you can't modify them if you intend to use them on your robot.
Quote:
Originally Posted by Mike Betts View Post
Steve,

It must be in an unmodified form before kickoff (it can not have been modified in a previous season). However, I believe that modification during the season is permitted under <R29>...

JMHO,

Mike
Quote:
Originally Posted by Tristan Lall View Post
Good catch on the rule question. I think you're right; if not commercially-available any longer, <R29A> says they must be unmodified—which they aren't—and <R29B> says they must obey other rules—of which the motor rules <R46> and <R47> seem to be pertinent. (There is some question about whether modifying a motor such that it is incapable of being used as a motor renders it permissible for use this season.)

I'm not sure what the GDC was intending with this rule. Is there something special about formerly-COTS parts that necessitates their being left unmodified? Perhaps a concern that teams would re-use particular fabricated items from old robots? (Not that I think this rule would be the logical response to that; I'm just speculating.)
These are all really good points. The one thing that makes this mash-up questionable to me in light of these rules is the interface plate.

On the Globe motor/transmission these two items are actually one. The plate is both the motor end plate and the motor mount to the transmission. I think, or should I say I know, that this is a gray area and would definitely take a ruling from the GDC to see if it is legal or not. For us this year, it is not an issue as we will not be using it. That said, I'll post the question to the GDC today and see if they can make the answer clear according to this years rules.
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  #32   Spotlight this post!  
Unread 25-03-2011, 23:12
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Re: Globe transmission with other motor(s)

If a 775 were completely isolated from the frame, how much will a case short effect motor performance if left alone (as in not 'zapped' to 'clear debris')?

I wish I had the chance to gain more experience with the globe motor. I've only heard good things about it. The 775, on the other hand...
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Last edited by PAR_WIG1350 : 25-03-2011 at 23:15.
  #33   Spotlight this post!  
Unread 07-06-2011, 11:40
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Re: Globe transmission with other motor(s)

Just as a follow up on this thread:

I asked the GDC via the Q&A site about the legality of this combination. Unfortunately, the Q&A closed right after I posted the question and never received a response.

We brought this motor and transmission with us to St. Louis. When I found an inspector that had a few free minutes, I showed him the motor and asked him if he believed it would be legal to use.

We bantered back and forth a bit, I told him of all my concerns and where I thought it might be illegal. He was able to convince me that as long as it was unmodified prior to the season and had been a KOP item in the past, then it was legal!

Good to know.
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2012 Sacramento Semi-Finals, 2012 Sacramento Innovation in Control Award, 2012 SVR Judges Award.
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