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 Post subject: Vibration isolation phonograph motors
PostPosted: Tue Nov 03, 2020 1:51 pm 
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Victor Jr
Joined: Wed Nov 15, 2017 1:32 am
Posts: 8
Hello everyone,
I am currently working on an electric Credenza motor although my question will be more generic.
I am trying to minimize the "hum" produced by this motor and have tried the wood shims for the coils and have also tried shims between the coils and the motor frame. Neither approach improved on the "hum" produced when this motor was fastened to the motor board.
My question:
Has anyone, perhaps with some industrial vibration damping "chops", researched what to use in place of the original felt washers which go on either side of the bolts when fastening this motor to the motor board? I can imagine that a good answer to this question might benefit the reduction of mechanical noise coming from spring driven motors as well. For my particular situation, someone else had installed "rubber" (neoprene?) washers which seem quite resilient and so I have reused them, but in this world of high tech problems and high tech solutions, I have to imagine there is a more elegant replacement for these washers. A quick Google search returns materials such as Sorbothane. I know that specialty materials can be very pricey, so does someone know the best-performing material and if it comes in a thickness from which washers can be cut or, even better, do such washers already exist?
Thank you for your input!
Don Mayer


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 Post subject: Re: Vibration isolation phonograph motors
PostPosted: Tue Nov 03, 2020 5:01 pm 
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Victor VI
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 3261
Location: Harrison Township, MI
Don,

Are the neoprene washers only between the motor & motor board, or are they also under the screw heads, on the top side of the motor board? I would try using them top & bottom, and also possibly enlarging the motor board bolt holes slightly to prevent the mounting bolts from touching the sides of the mounting holes.


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 Post subject: Re: Vibration isolation phonograph motors
PostPosted: Thu Nov 12, 2020 12:52 pm 
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Victor II
YouTube: Dyslexic Genius Hurt
Joined: Thu May 11, 2017 7:50 pm
Posts: 221
Location: Simpsonville, South Carolina
Dyslexic Genius Hurt call me about it 864 326 1680


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 Post subject: Re: Vibration isolation phonograph motors
PostPosted: Sun Nov 15, 2020 9:16 am 
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Victor VI
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 3261
Location: Harrison Township, MI
Any progress Don?


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