I doubt that they actually amplify the noise but certainly buildings serve
as excellent waveguides for some acoustic frequencies. Although thinking
about it now you could get spots where you get constructive interference of
the acoustic transmission multipaths which could make that spot much louder
than it intuitively would be. It's the principle of the whisper room in the
capitol building in DC.
That's only going to occur in certain spots though and only in the presence
of fairly smooth acoustic reflectors.
Although I haven't had a chance to really check them out or use them,
the helical cutter head planers are supposed to be much quieter. They
seem to be reserved more for the industrial machines, and not the small
shop and hobbyist woodworkers. I know that there are retro fit
cutterheads for some machines.
I put weather stripping around the garage door. 2 benefits: greatly
reduced noise from my power tools and keeps out wind blown rain. I can
turn on the DC and planer and can barely hear a thing when standing
outside the garage. If it's hot, I have to open things up, so I'm
thinking of installing a wall unit A/C.
My nearest neighbor's house is 12' away and she has never complained
about the noise (and she is a b*tch, so I KNOW she'd complain if it was
another suggestion: don't start too early in the morning or run late
into the evening, so that if a bit of noise escapes your shop, it won't
seem quite so bothersome to your neighbors than if you disturbed them
outside of "business" hours.
I occaisionally ask if my woodworking is bothering the neighbors, and
consistently, I've been told that it doesn't.
Having a neighbor with a Harley Davidson or two must make my machines seem
quiet in comparison. (And he's a really good neighbor!)
Yes, I also have a neighbor (a good neighbor too) with a Harley, and ironically
after first posting this has left his Harley idling in the driveway for 5-10
minutes at 6:00AM and rides it around the nieghborhood streets. I wait till
after 10:00AM to run the planer on the weekends.
If you haven't already insulated and sheetrocked, you can eliminate a
lot of noise by building a second frame for each wall inside of the
building, leaving a small amount of dead air space between it and the
original frame. You lose a little space, but the sounds cannot travel
through the wall nearly as effectively- and it also adds a little
insulation value. It'll still be loud inside the garage, but nothing
like it was outside.
2 tests I tried yesterday:
1. Remove DC -much quieter- good chip displacement, but I dont like some of
the dust in the air and clean up on the floor etc.
2. Open the vacuum on another location on the DC, this cut down the amount
of air being pulled acrooss the blades. Not a quiet as DC removed but
seemed half as loud. First time I ran with no ear protection (not to be
practices for long periods though) The sound that can be heard outside was
dropped dramitically -Going with this one.
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