the sounds made when working at this machine are created by the electric motor and the grinding of the spine of the knife on the grinding wheel. the knife-spine grinding machine is in use at the knife factory windmühlenmesser robert herder in solingen (germany, north rhine-westphalia), which was founded in 1872.
i was skeptical of bkess's post since the grinding noise seemed way louder than a dirty rail would cause, but a good swipe across it with a cloth actually did stop the noise
i can't tell if it's the fan or the internal hd that is making the noise. the sound it makes inside is like clattering, or grinding. thinking that it's the fan, i'll use an air spray can to try
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levels of noise generated from grinding machines were measured. noise levels as high as 116db was obtained. these levels of noise can be stressful that can result to fatigue. it is capable of causing temporary and permanent deaf. noise spectra generated from grinding machines are mixture of low and high frequencies. low and high frequencies noise can have negative effects on memory.