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Unread 28-01-2005, 15:25
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
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Re: Modifying CIMs to implode?

Quote:
Originally Posted by Andrew Schuetze
I am not going to test the rule or disrespect the advice of motor techs on this list. My follow up is in regards to the reported gain in radiational cooling by removing the black paint by sanding to the bare metal?

Our team has never modified a motor or mount but the comment about bare metal verses paint is of mild interest. Does this violate the rule or even the spirit of the rule? I would guess that one could even add paint to the housing as part of some color scheme on the robot...
Andrew,
I think the rule is clear that removing the paint does not change the basic ops of the motor. But like I have said many times before, if the Chalupas (or any motor) are overheating they are a symptom not a cause. Hot motors indicate a problem somewhere else. Fix the problem. When the case of the Chalupa is hot, think what the temp might be inside at wire level.
When the case is too hot to touch, you have already sacrificed molten varnish to the electrical gods. There is no coming back from this abuse and no amount of external cooling is going to save the motor. The internal temperatures, melt the varnish insulation, run the lubricant out of the bearings, distort the armature plates and shaft, and breakdown the internal adhesives used to keep all the parts in alignment. Remember that the only conduction path from armature to outside world is the shaft and bearings. All other cooling is by convection or radiation which is a slow process.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.