HomeRoast Digest


Topic: Sound Box for the iR2 (was: I'm giving up) (4 msgs / 261 lines)
1) From: Demian Ebert
That's a great idea. I was somewhat worried when I started using my iroast
years ago that the routine exposure the roar wasn't good for my ears. I was
going to run a noise-meter during a roast and never got around to it. Then I
switched to a SC/TO and noise is no longer an issue. But an insulating box
is a swell idea. I still use my iroast for smaller batches and might have to
try that. I think I've even got some leftover 6" PVC pipe...
Demian

2) From: Allon Stern
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On Dec 4, 2007, at 7:13 AM, Demian Ebert wrote:
<Snip>
i-Roast 2, adapter ring present, but no vent pipe attached, no beans  
loaded, on preset 2, 1st stage
Radio Shack SPL meter, cat# 33-2050, set for A weighting, slow response.
90dB SPL @1M from side
100dB SPL @4inches from side, where your ear might be when listening  
for 1st or 2nd crack.
Goes up about 2dB towards the bottom of the unit, down 2dB towards  
the top, away from the airstream.
the handle side also seems marginally louder.
Cooling cycle is about 2dB louder too.
Per OSHA:
    TABLE G-16 - PERMISSIBLE NOISE EXPOSURES (1)
                             |
   Duration per day, hours   | Sound level dBA slow response|
                             |
8...........................|                    90
6...........................|                    92
4...........................|                    95
3...........................|                    97
2...........................|                   100
1 1/2 ......................|                   102
1...........................|                   105
1/2 ........................|                   110
1/4  or less................|                   115|
  Footnote(1) When the daily noise exposure is composed of two or
more periods of noise exposure of different levels, their combined
effect should be considered, rather than the individual effect of
each. If the sum of the following fractions: C(1)/T(1) + C(2)/T(2)
C(n)/T(n) exceeds unity, then, the mixed exposure should be
considered to exceed the limit value. Cn indicates the total time of
exposure at a specified noise level, and Tn indicates the total time
of exposure permitted at that level. Exposure to impulsive or impact
noise should not exceed 140 dB peak sound pressure level.
Keep in mind that OSHA isn't the most conservative organization; also  
note that the i-Roast produces broad spectrum noise, and not impulse  
noise.
Personally, I think I'm gonna wear hearing protection while roasting  
in the i-Roar. Still need to get some noise canceling headphones to  
try to hear the cracks, and cancel out the roar.
-
allon
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On Dec 4, 2007, at 7:13 AM, Demian Ebert wrote:
That's = a great idea. I was somewhat worried when I started using my iroast = years ago that the routine exposure the roar wasn't good for my ears. I = was going to run a noise-meter during a roast and never got around to = it.  i-Roast 2, adapter ring = present, but no vent pipe attached, no beans loaded, on preset 2, 1st = stage
Radio = Shack SPL meter, cat# 33-2050, set for A weighting, slow = response.
90dB SPL @1M from = side100dB SPL @4inches from side, where your ear might = be when listening for 1st or 2nd crack.
Goes up about 2dB towards = the bottom of the unit, down 2dB towards the top, away from the = airstream. the handle side also = seems marginally louder. Cooling cycle is about = 2dB louder too.
Per OSHA:
   TABLE = G-16 - PERMISSIBLE NOISE EXPOSURES (1)                     =       |  Duration per day, hours   = | Sound level dBA slow response|                     =       |8...........................| =                   906...........................|              =       924...........................| =                   953...........................|              =       972...........................| =                   1001 1/2 ......................|               =     1021...........................| =                   1051/2 ........................|               =     1101/4  or = less................|                   = 115| Footnote(1) When the daily noise = exposure is composed of two ormore periods = of noise exposure of different levels, their combinedeffect should be considered, rather than the individual = effect ofeach. If the sum of the following = fractions: C(1)/T(1) + C(2)/T(2)C(n)/T(n) = exceeds unity, then, the mixed exposure should beconsidered to exceed the limit value. Cn indicates the = total time ofexposure at a specified noise = level, and Tn indicates the total timeof exposure permitted at that level. Exposure to = impulsive or impactnoise should = not exceed 140 dB peak sound pressure = level.
Keep in mind that OSHA = isn't the most conservative organization; also note that the i-Roast = produces broad spectrum noise, and not impulse noise.
Personally, I think I'm = gonna wear hearing protection while roasting in the i-Roar. Still need = to get some noise canceling headphones to try to hear the cracks, and = cancel out the roar.-allon= --Apple-Mail-11--565073198--

3) From: Mejia, Carlos
This is a multi-part message in MIME format.
I already had some fairly decent Sony NC headphones, (cost ~$150) for
international flights when I read a posting on this.  I tried them a few
times.  It really helps to diminish the load sound but wasn't a drastic
difference regarding hearing the cracks.  The sound box helped a LOT
more.  Now I think I'll have build a new one using PVC as Demian
mentioned.  That would be even better sound insulation.  I'm surprised
that the manufacturer hasn't addressed this issue.  It seems that it
would not be to hard to reduce the noise enough so that users could hear
the cracks.  
 
carlos
From: homeroast-admin
[mailto:homeroast-admin] On Behalf Of Allon Stern
Sent: Tuesday, December 04, 2007 8:24 AM
To: homeroast
Subject: Re: +Sound Box for the iR2 (was: I'm giving up)
 
 
 
Keep in mind that OSHA isn't the most conservative organization; also
note that the i-Roast produces broad spectrum noise, and not impulse
noise.
 
Personally, I think I'm gonna wear hearing protection while roasting in
the i-Roar. Still need to get some noise canceling headphones to try to
hear the cracks, and cancel out the roar.
-
allon

4) From: Demian Ebert
Thanks. I was wondering about that. I think I'll build a tube when I get
home in a couple of weeks. My SCTO is much quieter and I get more beans per
batch, still it's nice to do the smaller true test batch or to get "rid" of
leftovers.
Demian
On Dec 4, 2007 10:24 AM, Allon Stern  wrote:
<Snip>


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