I always carry some better quality dust masks, just in case. I made a plexiglass shield for this collector to channel the air flow and provide enough space for two students to work. For demos and portable use, I have a box with two fans that draws air in through a cut down 5 micron furnace filter. Possibly another Instructable for a future time. On my bench, I made a dust collector from a squirrel cage motor, coffee can and vacuum cleaner bag. I live in a rural area and sometimes work outside with a small fan blowing the dust away from me. It is a *REALLY* bad idea to breath glass dust. It is not a good idea to breath glass dust. Care should still be taken handling the glass since it can be sharp when broken. I have had glass break in my carrying container but never one I am engraving. The tools are not very powerful but the basic rotating tool precautions should be done: - Tie back long hair - No loose clothing or jewelry (necklaces, ties) - No gloves - Safety glasses. This results in a cutting edge that can be touched while it is spinning and not cause more than a light scrape. The diamond burrs are not sharp and, although they are rotating fast, are very small and fairly fine grit.
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