As discussed in the previous post, I took a sound meter around the workshop to get an idea of the different machines and the amount of noise they generate.
To qualify these figures, the machine in use was out-of-spec, so the readings should not be taken as gospel.
A reading of 85dB or above means there is a risk of permanent hearing loss.
100dB gives a max allowable exposure of 15 minutes
110dB – hearing damage likely after 60 seconds.
Remember that the time is cumulative. I don’t know over what time period (probably in 24 hours)
A 3dB increase in volume represents a doubling of the sound energy. Because the scale is logarithmic, a 10dB increase in volume represents 10 times the amount of sound energy, which will sound twice as loud.
Shed Ambient Noise: 58dB
Tablesaw: no load 85dB
With a non-noise limiting blade that had a resonance with the TS, 105dB
During a cut: 95 – 100dB
SCMS: no load 110dB
During a cut: 120dB – 125dB
Thicknesser: no load 106dB
During a cut: 110 – 120dB
Lathe: no load 62dB
Jointer/Planer: no load 80dB
During a cut: 100dB
Forcing the cut: 110dB
Drill Press: 85dB
Bandsaw: no load 70dB
During a cut: 100dB
Router: 100dB
Circular Saw: 115dB
Nail Gun: firing 126dB
During disconnect: 124dB
These figures are not as accurate as I would have liked (limitation of the equipment), but it gives a pretty fair idea that thicknessers, brushed motors (SCMS and circular saws) and in general during an actual cut on other machines, hearing protection is mandatory.
The screaming motor of a thicknesser which is often used for quite long jobs, multiple passes will leave you with permanent loss every job.
The sound a nail gun produces may not last more than a fraction of a second, but that instantaneous sound will lead to a hearing loss that is less temporary.
Some interesting findings out of all that: Increasing the pressure during the cut can increase the sound energy ten-fold. This can move a sound from needing 15 minutes to damage your hearing to one that will take 60 seconds to do the job.
Brushed motors are bad news (my thicknesser, SCMS, circular saw)
If something sounds loud, and particularly louder than something else, the amount of sound energy required to achieve that increase in volume is huge. If something sounds loud, be sure that your hearing needs your intervention!!!!
Filed under: Uncategorized | Tagged: Bandsaw, Cabinet Saw, Circular Saw, Ear Defenders, Hearing, Safety, Safety Week, SCMS, Thicknesser |
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Stu
Did you happen to measure the noise of the Triton?
Cheers
Jeremy
The circular saw tested at 115dB was the 2400W Triton. Granted mounting it in the table would make it slightly quieter (with the shielding provided by the table itself), but still way above the volume that you could operate safely without hearing protection.
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