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  #16   Spotlight this post!  
Unread 15-02-2011, 08:08
Dad1279 Dad1279 is offline
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Re: Banebots RS-775 Case Short

We were lucky for once. 1 out of 6 bad, but it was a spare.

We also have one with the screw threaded slightly out of square, when mounted in a Cim-U-later, it binds the motor.
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Unread 15-02-2011, 08:35
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Re: Banebots RS-775 Case Short

So far, no problems for us.

-Nick
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Unread 15-02-2011, 12:22
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Re: Banebots RS-775 Case Short

I just got off the phone with BaneBots.

They believe the problem is caused by a small amount of debris in the motor possibly introduced during manufacturing.

They have had success with several motors in house when they apply 12V between the motor lead and the case. This zaps the debris and you should be good to go. You might have try this with both leads depending on where the debris is.

I will try this on our 2 shorted motors tonight and post our results.

-David
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Unread 15-02-2011, 12:31
Tom Bottiglieri Tom Bottiglieri is offline
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by dyanoshak View Post
I just got off the phone with BaneBots.

They believe the problem is caused by a small amount of debris in the motor possibly introduced during manufacturing.

They have had success with several motors in house when they apply 12V between the motor lead and the case. This zaps the debris and you should be good to go. You might have try this with both leads depending on where the debris is.

I will try this on our 2 shorted motors tonight and post our results.

-David
Thanks for the info. I'll give this a go as well and post the results.
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Unread 15-02-2011, 12:39
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by dyanoshak View Post
I just got off the phone with BaneBots.

They believe the problem is caused by a small amount of debris in the motor possibly introduced during manufacturing.

They have had success with several motors in house when they apply 12V between the motor lead and the case. This zaps the debris and you should be good to go. You might have try this with both leads depending on where the debris is.

I will try this on our 2 shorted motors tonight and post our results.

-David
Would it be legal to open the motors for the purpose of cleaning them as long as they were not modified in any way?

I know it would be a difficult task, and might end up damaging the motors, but applying 12vdc across a known short is not what I would consider a safe option let alone a good fix. More debris could still be in the motor, and the frag from blasting the original offender is still in there and becomes a complete unknown. It would be like asking Murphy pay a visit at the worst possible moment.
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  #21   Spotlight this post!  
Unread 15-02-2011, 12:46
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by billbo911 View Post
Would it be legal to open the motors for the purpose of cleaning them as long as they were not modified in any way?

I know it would be a difficult task, and might end up damaging the motors, but applying 12vdc across a known short is not what I would consider a safe option let alone a good fix. More debris could still be in the motor, and the frag from blasting the original offender is still in there and becomes a complete unknown. It would be like asking Murphy pay a visit at the worst possible moment.
I agree it's not the safest option, but you could always try shorting it with a source that does NOT easily supply 500 A...
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  #22   Spotlight this post!  
Unread 15-02-2011, 12:55
dyanoshak dyanoshak is offline
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Re: Banebots RS-775 Case Short

I agree, this "fix" makes me a little uneasy. I am just repeating what they suggested.

I figure since our shorted motors are useless anyway, it is worth a shot. BaneBots told me to give them a call if the "fix" doesn't work or there are more problems.

I would try this with a smaller battery or a current limiting power supply. They told me that it should only take a few milliamps to zap the debris/residue (at one point the BaneBots rep mentioned "manufacturing residue").

-David
  #23   Spotlight this post!  
Unread 15-02-2011, 13:41
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Re: Banebots RS-775 Case Short

David,
I just think this method is bad on so many levels. Did they give you any idea on what form of debris may be present that they are trying to zap? If this is metal flakes left over from balancing operations, shorts to case are going to be the least of the problems. Depending on the size of the debris, this may be a permanent fix or a permanent short.I won't have access to a motor for a while, can you examine one of yours?
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  #24   Spotlight this post!  
Unread 15-02-2011, 14:22
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Re: Banebots RS-775 Case Short

If someone does attempt the zap, report back on your findings ASAP, I know a few teams who would be interested to know if this "fixes" the motors or not.

-Brando
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  #25   Spotlight this post!  
Unread 15-02-2011, 17:48
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by dyanoshak View Post
I agree, this "fix" makes me a little uneasy. I am just repeating what they suggested.

I figure since our shorted motors are useless anyway, it is worth a shot. BaneBots told me to give them a call if the "fix" doesn't work or there are more problems.

I would try this with a smaller battery or a current limiting power supply. They told me that it should only take a few milliamps to zap the debris/residue (at one point the BaneBots rep mentioned "manufacturing residue").

-David
I gave both leads about 100mA through the case for about 3 minutes each. Nothing. I'm debating if a big burst (like, say, a battery) is worth trying. I can't really imagine it is.
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Unread 15-02-2011, 18:39
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Re: Banebots RS-775 Case Short

Team 85 gave the BaneBot suggestion a try to rectify the issue with the 775 motor and we are good to go!
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Unread 15-02-2011, 18:47
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by Hilda View Post
Team 85 gave the BaneBot suggestion a try to rectify the issue with the 775 motor and we are good to go!
Could you check the continuity again after using it while slowly turning the shaft by hand? I'm wondering if it is an intermittent short.
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Unread 15-02-2011, 19:26
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by EricVanWyk View Post
Could you check the continuity again after using it while slowly turning the shaft by hand? I'm wondering if it is an intermittent short.
Did what you asked and we are still good to go
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Unread 15-02-2011, 19:44
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Re: Banebots RS-775 Case Short

Quote:
Originally Posted by billbo911 View Post
Would it be legal to open the motors for the purpose of cleaning them as long as they were not modified in any way?
Well <r47> states

Quote:
<R47> Motors and servos used on the ROBOT shall not be modified in any way, except as follows:
A. The mounting brackets and/or output shaft/interface of the motors may be modified to
facilitate the physical connection of the motor to the ROBOT and actuated part.
B. The electrical input leads on the motors may be trimmed to length as necessary.
C. The locking pins on the window motors may be removed.
D. The connector housings on the Window motors (PN 262100-3030 and 262100-3040) may
be modified to facilitate lead connections.
I would take that as a "no" just to be on the safe side.
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Unread 15-02-2011, 20:34
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Re: Banebots RS-775 Case Short

~50% of our motors (atleast 7) had the Case Short.

We performed the technique suggested by Banebot, with a standard FIRST battery, and "fixed" the issue on our motors.

I wasn't involved in the process, but I think they just swiped the positive lead across the motor case to limit any additional damage. It took a couple of swipes to totally eliminate the short.

Not sure what the long lasting effects will be.... we plan to run these motors on our practice bot to see how well they work.

We are only using (2) RS775 on the our robot, and I think we had (4) good ones...so those will go on the competition robot.
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