Hello Geoff,
Great recording, thought I was in my shop! The saw sounds the same as
my Felder and other commercial saws I've heard. One thing I have
noticed about having a small 200 sq. ft. shop is the noise is magnified
a couple of db more than in larger shop areas. Since insulating, I
have powered up the saw in the evening (when things are fairly quiet
outside) and after closing the doors and windows I've gone out to see
what the neighbors might have to listen to. It wasn't any louder than
the neighbor's dog when it barks when left in their garage at night.
Besides I figure that if there is an intruder out there and he hears
the sound of that blade power up.... he won't be around for long.
I did a calculation using pi to determine the number of additional ft.
a 12" blade will run over a 10" blade for 1 minute at 3440 RPM.
And the answer is: Approx. 1800 lineal ft. per minute, in other words
almost a third of a mile.
It will be interesting to hear whether others who listen to your
recording are getting the same volumn level.
Rod B.
"geoff shepherd" <geof-@...> wrote:
original article:
=247
Wow - yet again I am thoroughly impressed by the knowledge and
interest of
those participating in the forum. I haven't checked my e-mail for a
few days
due to long busy days at work. Let me try to respond to the
questions/thoughts in one message instead of a whole bunch.
Tom - Yes, motor speed at 60Hz is 3440. I like your idea of a PDF
searchable
parts catalog/owner's manual. As far as the owner's manual goes,
Acrobat
does a nice job of OCR these days.
John - My impression of the Unisaw vs. Felder saw noise is the exact
opposite. The Unisaws and JET Xacta saws I've used have all run
surprisingly
quiet. My Felder saw is a screamer in comparison. Both the new
Forrest WWII
and the stock Felder 12" blades sound about the same. I would
describe it as
a fairly loud woosh noise...
Charlie - The sound meter is a digital read-out Radio Shack model
33-2055
claiming accuracy to +/- 2dB at 114 dB SPL. It has two settings for
weighting: A and C. From the manual: A-curve responds mainly to
frequencies
in the 500-10,000 Hz range, and the C-curve responds to 32 - 10,000
range.
My measurements were given in the A-curve. The C-curve consistently
read
just 1dB lower than the A-curve for the saw.
Mark - Both of my 12" blades (a new Forrest and a moderately used
Felder)
make about the same noise. I positioned the sound meter pickup at the
"ear
height" at typical operator position (in the case of the tablesaw,
standing
to the left of the sliding table). Having no blade mounted registers
at
63dB. Totally enclosing the blade guard sides (with scrap wood)
reduced the
noise from 98dB to 90dB.
Joe - They are 12" blades. I don't have a 10" blade to try.
Rod - Maybe I just have two noisy saw blades. Feel free to visit this
weekend if Everett isn't too far of a drive for you and you have the
time.
See my other message for phone #'s.
OK everyone - If you've read this far, I went to the trouble of
making a
really cool (haha) recording through the sound level meter (it has a
microphone output jack). I set the recording input level based on the
table
saw, so you should get a good sense of dynamics. I edited the
recordings
into one 716KB WAV file that takes just a couple minutes to download.
The
sequence of the recording is Shaper, Jointer, Planer, Tablesaw, Dust
Collector (I added the DC just to irritate you, Mr. Renzetti!
hehehahah).
You can find it in the vault in my folder in the Members directory
(or try
the following link to the file on my own web site):
Even though it is a "telephone quality" recording, I feel it is still
a good
representation for what the
setup actually sounds like.
...Geoff
