Author Topic: Woodworking Noise - Reduce in shop and getting to neighbors  (Read 5632 times)

scottatss

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Woodworking Noise - Reduce in shop and getting to neighbors
« on: December 31, 2008, 10:41:29 AM »
I will operate woodworking equipmt routers, saw, planer in a res' area.  Walls of the bldg are concrete  and brick 15" thick at bottom 8" thick above 5'.  Windows dual pane. Doors heavy and w/s.
 
Main Q: How to reduce noise getting outside?
 
To reduce sound reverb back and forth between walls - what if I stacked sand bags along some of the walls?

what about applying large mechanical texture to walls - i.e. 1"x 1" vertical wood strips every 2"o.c.? Or vertical columns of brick?  i.e. a "rough" surface where roughness measured in inches rather than microns  would these dampen sound reflection?

dual pane windows - would adding second dual pane panel with at non-parallel planes ~4" away be worth the trouble?

Laminated safety glass - does the glue layer inside between the two layers of glass dampen sound transmission?

Bottom line: What simple low tech things give best bang for buck - esp to reduce high pitched whine of routers cutting wood and planers planing wood?

johnbergstromslc

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Re: Woodworking Noise - Reduce in shop and getting to neighbors
« Reply #1 on: December 31, 2008, 09:07:15 PM »
Well, you already have massive walls, so the windows is where you should focus your efforts.  Adding a thick pane of laminated glass with a 4" airspace between your existing windows with excellent sealing would do nicely.  Don't worry about making it non-parallel - it makes little to no difference.  Also, do some remedial sealing on your current windows - they're likely to have gaps and poor sealing.

The doors you have sound good, so the last area to consider is the ceiling.  You might want to add a 2nd (or 3rd) layer of drywall to increase the mass and help keep the noise in.

Before you do anything, get a good sound level meter and take some measurements of how much noise is escaping your shop.  Maybe you have good soundproofing already and it's not an issue...

scottatss

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Re: Woodworking Noise - Reduce in shop and getting to neighbors
« Reply #2 on: January 04, 2009, 03:57:00 PM »
Thanks John, what are some inexpensive sound meter brands/models, and where might I get one online?

Now, a second question is how do I reduce noise INSIDE the shop for me and my helpers?  I''ve heard that a lot of "loudness" in a shop is the reverb of the noise back and forth off the walls, floor and ceilings.

Aside from trying to build covers for machines (I could probably manage one somewhat for a planer, but not for a CNC router). 
What else can I do to absorb sound inside?  Do sand bags absorb sound?  What about carpet on the walls or some places on the floors?  Some carpet pieces hanging from the ceiling?  What about some lead blankets from a medical supply (like the kind they lay on you for ex-rays)?

btw. The ceilings are "cathedral" about 12'high at the wall and ~16' at the peak - old wood beams and rush matting between the old beams, so the ceiling seems fairly "absorbant".


Bill

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Re: Woodworking Noise - Reduce in shop and getting to neighbors
« Reply #3 on: January 22, 2012, 06:35:14 PM »
I have a similar problem of trying to reduce sound to neighbors, but my problem is noise getting out through the duct.  I'm a stone sculptor and I have a 12" duct in my almost-finished studio.  I use an angle grinder that peaks out at 16,000 Hz at about 95 dB -- so most of the noise is very high frequency.  The duct mufflers I've seen peak in their efficiency at 1,000 Hz and then the efficiency goes down pretty quickly.  How do I attenuate through-duct noise at such a high frequency?

Bill

Randy S

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Re: Woodworking Noise - Reduce in shop and getting to neighbors
« Reply #4 on: January 23, 2012, 02:03:24 AM »
I will come back to the original post on Monday,,,as for the duct system you will want to line the duct with 1/2" foam mat and then do the baffle formula within the system. you need to create work load (energy loss) at the same time air is moving..so, create 3-90* turns to star the equation..add turns as you want to increase the reduction.

call me if you have more questions.
760-752-3030 ext 104
Randy S.
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