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G0440 2Hp Cyclone Dust Collector (2008)
- Sucks like there's no
tomorrow. Pleny - and I mean plenty - of airflow to support
my ~400 sq ft basement shop.
- Easilly supports 6" diameter main ducts.
- Excellent fine dust seperation (very minimal dust
makes it to the filter).
- The filter is rated for very small particle
sizes - very little hazardous dust makes it back to the shop air.
- Easy to clean the filter canister by pulling cables
which in turn pulls a round brush through the innside of the filter
- The dust bin rolls around easily on low profile
- Excellent manual with clear instructions.
Grizzly has made great strides with the quality of their
manuals in recent years.
- Got it for a great price - before the 2009 price
increase and with 20% MS Live Cashback thru eBay.
- Noisy. Much
louder than my old Jet cannister DC. The accessory muffler
($45 extra) does help reduce the noise level (details below) and is
money well spent. It's almost tolerable with the muffler, but
I still plan to implement additional noise abatement treatments in the
- Kinda large. I did manage to squish it in a
corner of my shop so that it fits in about the same space as my old Jet
cannister DC, but that was a bit challenging (details below).
- Emptying the drum isn't impossible, but it would be
easier with some sort of bag. I plan to make a home-brew bag
holder sometime soon.
- Not very easy to tell if the cust bin is full.
I'm concerned I'll overfill it someday, so I may look into
some sort of bin level detector.
is the first in a series of modifications intended to reduce the noise
from my G0440.
I pay the mortgage as a noise and vibration engineer so I have easy
access to a bunch of cool noise measurement equipment. For this test I
instrumented my shop with 4 diffuse field microphones. The first was
located in close proximity to the filter stack, the second was located
in close proximity to the cyclone body (I named that one drum to mean
the body of the cyclone an not the chip collection drum - bad
nomenclature on my part), a third was placed 3' from the cyclone at ear
level, and the fourth was placed 10' from the cyclone at ear level. The
cyclone is mounted to a concrete wall in the corner of my 20'x20'
basement shop (see pic earlier in this thread).
The data below is intended to quantify the effects of installing the
Grizzly muffler (which is just a simple "glass pack" type muffler
stuffed with acoustic absorptive foam) on the outlet of the cyclone
immediately before the filter stack. Pain in the patootie to install by
the way. The green bars in the background show the noise levels at each
of the 4 mics before installing the muffler, and the blue bars in the
foreground show the noise levels after installing the muffler - both as
a function of frequency as shown on the x-axis. The #'s in the legends
and on the big bars to the right of each plot are the overall levels
for these tests which is what you often hear folks reference with
handheld noise meters like you can buy at Radio Shack. Each of the 4
plots is data from an individual mic as labeled in the title legend. I
hope all that makes a modicum of sense.....
* The Griz muffler is effective. It reduces the 3' and 10' mic overall
levels by 5 to 6 dB(A) which is quite respectable for a simple glass
* Most of the noise appears to come from the filter stack (although I
didn't do a thorough source mapping)
* After I came upstairs my wife asked me what I did to quiet that
^&%$ dust collector. Unprompted by me. That right there was
worth the money and time to install the filter - she noticed a clear
difference. She still said it was far from quiet, but it was much
* I noticed a significant improvement in the shop as well. I'll still
need to do more to quiet it down, and I'll still need to wear hearing
protection till that happens, but it is definitely better. Not a
panacea, but an improvement for sure.
* Note that my shop is quite reverberant, so these #'s may be a bit
higher than you'd measure in other shops.
The next few things I try may not happen for a little while do to an
upcoming busy work period. I'll be trying absorption around
the filter stack, absorption on the walls, and possibly an acoustic
enclosure around the whole thing if needed.
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