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  #1  
Old 06-18-2017
stuntroc stuntroc is offline
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Default Spider Wiper Help

Hello all,

I'm working on the spider wiper (
) but am having trouble with the wiper shaft extension. It is unscrewing itself when it runs. I have lock washers on every nut but it still does it. My next thought is locktight but I'm not sure if I trust that to be the fix long term. As the wheels turn and bump into the legs the shaft unscrews itself due to the direction of the rotation and the direction of the threads.
Any help anyone can offer is appreciated!
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  #2  
Old 06-18-2017
fontgeek fontgeek is offline
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Instead of lock washers, maybe nylock nuts, or trap a lock washer between two nuts. The lock washer keeps tension on both nuts (man, that sounds painful). You can also add locket or even superglue when you install the nuts.
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Old 4 Weeks Ago
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Otaku Otaku is offline
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I'm assuming you're using common right-hand threaded bolts. Try using a left-hand thread but keep in mind that the nuts may tighten causing binding problems. Loctite thread locker is another possible solution. Nylon insert locknuts (as suggested above) have worked for me as well.
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  #4  
Old 4 Weeks Ago
David_AVD David_AVD is offline
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Can you run the motor in reverse and still have the same effect?
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  #5  
Old 4 Weeks Ago
stuntroc stuntroc is offline
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Guys, thanks for all the great replies! I love being part of such a supportive forum.
David_AVD what a brilliantly simple idea! I didn't think to see if reversing the power polarity would make the motor run in reverse (I work more with pneumatics than motors). It did and worked well! Thanks so much!
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Old 4 Weeks Ago
fontgeek fontgeek is offline
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Just keep in mind that the designs for motors includes airflow for cooling, and by reversing the direction/rotation of the motor, you are also, often, reversing the airflow direction. For a wiper motor, it may not be a big issue, but it's something to keep in mind. It's particularly a problem when people cannibalize fans for their motors, they change the direction and or remove the blades from the fans, and end up frying the motors because they overheat from the lack of airflow.
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Old 4 Weeks Ago
stuntroc stuntroc is offline
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Good to know, thanks!
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Old 4 Weeks Ago
David_AVD David_AVD is offline
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I agree about motors used from fans and other applications where they incorporate air flow into the design. I've never seen that in wiper motors or any DC motor that I've used before though. Usually the cooling is obvious.

Great result stuntroc. It's nice when there's a simple solution.
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