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Faraday cage?

Discussion in 'General Electronics Discussion' started by jeffie3, Nov 18, 2017.

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  1. jeffie3

    jeffie3

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    May 21, 2015
    I want to build a Faraday cage for a machine I have. I have aluminum and stainless steel. Does the cage have to be made of steel? Or would aluminum or stainless steel work? If so which would be better?

    Thank you,

    Jeff
     
  2. Alec_t

    Alec_t

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    Jul 7, 2015
    Any metal would work for electrical screening. For magnetic screening you would need ferromagnetic material, e.g. common steel. IIRC, some stainless steels are ferromagnetic; others are not.
     
  3. Externet

    Externet

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    Aug 24, 2009
    That discarded microwave oven behind the spider webs can serve well if fits the size. Disemboweling its components will leave a good and lightweight cage.
     
  4. FuZZ1L0G1C

    FuZZ1L0G1C

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    Mar 25, 2014
    For visibility of your machine, an expanded-mesh wastepaper basket will serve as a good Faraday cage.
     
    jeffie3 likes this.
  5. jeffie3

    jeffie3

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    May 21, 2015
    Thank you all for your answers. I need to isolate a toroidal power supply PS-N80N24R5 and 4 servo drives from each other. I should have given more detail in the beginning. The power supply 240 volts input, output is 80 volts 16.5 amps, 24 volts 2 amps, 5 volt 1 amp. The servo drives are AMC 30A8.
     
  6. BobK

    BobK

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    Jan 5, 2010
    Tell us more. One does not normally need a Faraday cage for that purpose.

    Bob
     
  7. jeffie3

    jeffie3

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    May 21, 2015
    I am not that good with electronics. Most of my CNC machines has some type of Faraday cage around the power supplies. Also trying to make sure the encoders. which operate at 5 volts, don't pick up any stray noise. Most of the things I have read, say to make sure you use shielded cables for the encoders. The encoders feed into the servo drives. and to a board a Mesa 7I77 board.
     
  8. BobK

    BobK

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    1,688
    Jan 5, 2010
    A metal case for the power supply is a good idea, most that would be appropriate for a CNC machine tend to come that way. And using shielded cables is a good idea.

    Bob
     
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  9. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Proper supply filtering (local decoupling capacitors etc) and good grounding, supplemented by shielded cables, is as much as even the professional equipment use.

    The electronics, including power supplies, should be enclosed as a matter of course.
     
    jeffie3 likes this.
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