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Line 15: − Based on the following, approximately 35% of airborne dust (by weight) generated by cutting oak is in the 1 to 10 micron range.+ − http://en.wikipedia.org/wiki/File:Particle_size_distribution_of_hardwood_dust.jpg+ + + + +
→Do we produce enough dust for it to be a problem?
== Do we produce enough dust for it to be a problem? ==
== Do we produce enough dust for it to be a problem? ==
A single ripping cut with a thin kerf blade of 5/4 oak plank 8' long will create 10 grams of <15 micron dust. If distributed evenly throughout the shop, this would create a dust concentration of 9.1 mg/m**3, much greater than the ACGIH hardwood limit of 1.0 mg/m**3. In addition, fine dust is difficult to remove. When it finally settles, sweeping causes much of the dust to again become airborne. Vacuuming is only effective when using a fine filter. So the fine dust tends to accumulate, bringing the airborne dust levels higher and higher.
Calculation: https://docs.google.com/spreadsheets/d/18togRk2AZD1RfjSE-m5PjONLy_UOMeJCfzvsSp8gQTg/edit?usp=sharing
10% of dust (by volume) generated by sawing oak consists of particles smaller than 15.1 microns.
10% of dust (by volume) generated by sawing oak consists of particles smaller than 15.1 microns.
http://annhyg.oxfordjournals.org/content/44/6/455.full.pdf
http://annhyg.oxfordjournals.org/content/44/6/455.full.pdf
Approximately 1/3 of this is < 10 micron.
Approximately 1/3 of this is < 10 micron.
This is an interesting graph showing the distribution of particle sizes created by various woodworking operations.
http://en.wikipedia.org/wiki/File:Particle_size_distribution_of_hardwood_dust.jpg
== Particle Monitoring ==
== Particle Monitoring ==