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Sound Proof CNC Cabinets

Discussion in 'General Talk' started by GrayUK, Jun 5, 2017.

  1. GrayUK

    GrayUK The Secret of Life is ..... Choice!
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    I know it has been mentioned before, with regard to sound proofing cabinets, but maybe we should start a new thread concentrating on just that, so as to get all relevant designs, models and sizes in one place. I know I will be needing to design one for my next 1000 x 1500 machine, in the not too distant future, and have managed to get hold of some second hand double glazed units for it. :)
    So if anyone has built one, maybe they would contribute the details here, with pictures would be even better.
    SketchUp plans would be even better!!
    If you are thinking about needing one then discuss it here. :thumbsup:
    Cheers
    Gray
     
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  2. Paul Stoller

    Paul Stoller Veteran
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    I'm currently building an enclosure for my machine, I'm doing the box within a box concept. Both the inner and outer box will be made out of MDF, 3/4 inch MDF for the outer box, 1/2 inch MDF for the inner box (to save a bit on weight). Each box will be separated by an inch of carpet padding foam. The dimensions will be roughly 48 inches wide by 30 inches tall and 32 inches deep. It's bigger than I need for the standard size C-BEAM but I plan on upgrading my machine to either the C-BEAM XL or a Sphinx XL style build and wanted the room to expand. I'll be taking some pictures during the construction process and will be posting some relatively soon.
     
    #2 Paul Stoller, Jun 6, 2017
    Last edited: Jun 7, 2017
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  3. GrayUK

    GrayUK The Secret of Life is ..... Choice!
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    I was thinking of using an inner and outer skin, about an inch apart, but then pumping in a few tubes of expanding foam. As I say I got hold of a few second hand, but good, double glazed units, and some new ones. As a tip, go to the actual shop or yard where they put the old units, before they scrap and smash them. The guy I went to, was only too pleased to off-load some to me, because it saved room in his skip. He even gave me some new ones because they had been made the wrong size! :thumbsup:
    Gray
     
  4. GrayUK

    GrayUK The Secret of Life is ..... Choice!
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    Sorry mate! :banghead:
    "Units" is a term used for "double glazed units", before they are fitted into the frames. If you have a window frame which measures say, 1500mm x 1000mm, they will make up a complete, sealed double glazed window (unit), to fit in the frame. It is very common for people to get the measurements wrong and need to make new ones. Usually these end up in the skip. Obviously, if you can utilize one or two of these for your cabinet, although quite heavy, they would give a great view. :)
    Gray
     
  5. Jonathon Duerig

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    I've recently been reading about silencers/mufflers for dust collection. Apparently people have made DIY versions or just used a length of insulated ventilation duct. The sound reduction is significant. So this is something to think about either for properly ventilating your enclosure while reducing noise, or adding onto your dust collection if the vacuum/collector is outside of the enclosure.

    Forgot to add a link to the relevant page:

    Dust Collection Research - Homemade Muffler
     
    #5 Jonathon Duerig, Jun 9, 2017
    Last edited: Jun 9, 2017
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  6. Paul Stoller

    Paul Stoller Veteran
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    Here is the outer box. Now I'm trying to select the foam for the foam layer

    . FullSizeRender (2).jpg
     
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  7. Ernest Sutherland

    Ernest Sutherland Well-Known
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    Does anyone know of a good dust boot for the xlarge build?
     
  8. Ernest Sutherland

    Ernest Sutherland Well-Known
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    I am planning on building one for my xlarge too.
     
  9. crispin

    crispin Journeyman
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    Foam is ok for treating surface noise vibrations and for diminishing internal reflection but it's not very effective at blocking sound transmission. Use a dense material to stop sound. Adding multiple layers of Gypsum Board ("sheetrock") to the inside of that wood enclosure should keep most of the noise enclosed.
     
  10. NeoMorph

    NeoMorph Journeyman
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    I made a box like this out of MDF about 10 years ago... and OMG did I regret it. As long as you are never going to move it and you have several bods to help then go ahead but I found the weight of thick MDF projects builds up really quickly, and that's without taking into account of the machine inside.

    In the end I went for MDF on the outside box and plywood on the inside box. A bit of weight for stability and lightness with the ply that still meant it was strong. I could still move the final setup (just) but the first version I had trouble with a couple of us trying to move the thing.
     
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  11. Paul Stoller

    Paul Stoller Veteran
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    I've currently got the outer box built and on casters to help handle the weight, I've gotten my foam, but still need to build my inner box. I had been going back and forth on making the inner box out of plywood instead of MDF, I may go that route based on your suggestion I just hope I get enough sound reduction out of that.
     
  12. NeoMorph

    NeoMorph Journeyman
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    You could put some acoustic matting on the inside to dampen the first hit. Something like flat bevel acoustic tiles to stop chips catching in it. It's low profile and is only going to be reducing the first reflection. It would probably do better than heavy MDF because it is still a flat surface and being enclosed it will be bouncing around like crazy. Its like how people thought hardwood floors were really cool... until they got it installed and suddenly their home audio system sounds like crap because the floor is reflecting all the harsh sounds where carpet is dampening it... Actually, thinking about it, carpet would be a cheap alternative to lining the box too. Not as good performance but it's just to to stop the high frequency reflections before the main sound dampening of the sandwich filling..
     
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  13. Paul Stoller

    Paul Stoller Veteran
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    I’ve nearly gotten my cabinet completed, I’m happy with it thus far, getting ready to perform first cuts with it to see how well it works.

    Outer box
    E900E7ED-20FF-4731-8086-8E6D3E235F88.jpeg

    Inner box
    21E8C2A7-D19A-4BA8-BBCF-1C03CC46ACD9.jpeg

    Closed cabinet
    84F6DBC8-A188-4013-BFA2-C1079921916D.jpeg

    Open cabinet
    0A32D5D4-22DF-4FA1-94C5-109276A9064C.jpeg
     

    Attached Files:

  14. GrayUK

    GrayUK The Secret of Life is ..... Choice!
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    Looks like you could do with a Cam in there. :thumbsup:
     
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  15. Paul Stoller

    Paul Stoller Veteran
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    It’s coming, perhaps more than one.
     
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  16. Paul Stoller

    Paul Stoller Veteran
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    I did a quick noise test while cutting MDF, it was peaking at around 85 dB and outside the cabinet it was peaking at right around 50 dB. I’ll be repeating the test once I can cut some aluminum, but thus far I’m quite happy with the performance.
     
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  17. NeoMorph

    NeoMorph Journeyman
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    I was completely wrong regarding using MDF. The added weight actually helps keep the machine from vibrating which reduces the sound coming from the CNC.

    So eventually I went with 18mm MDF too lol. Not afraid to say I was wrong either. You live and learn.

    I did have to put my unit on 8 heavy duty industrial castors though.
     
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  18. Paul Stoller

    Paul Stoller Veteran
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    Yeah it certainly makes things heavy, I’m happy with using mdf for the outer box and plywood for the inner. It already is super heavy using mdf for both would probably been overkill. It’s already going to be bear to move down the two flights of stairs when I move.
     
  19. GrayUK

    GrayUK The Secret of Life is ..... Choice!
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    Paul:-"It’s already going to be a bear to move down the two flights of stairs when I move." :banghead::banghead::banghead::D :ROFL::ROFL:
     
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  20. Paul Stoller

    Paul Stoller Veteran
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    Ah, the downsides of living in an apartment.
     
  21. NeoMorph

    NeoMorph Journeyman
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    I planned with my unit... it actually unbolt into two separate units that fit through my flat doorways as I built it indoors and plan on putting it into a garden workshed eventually.
     
  22. Scotty Orr

    Scotty Orr Master
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    If the machine is going in a garden shed, you can leave the cabinet behind for the next renters....:D
     
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