Spalted Woods!
Dominic Greco in Richboro PA
>Tom,
There is a danger of having an allergic reaction when turning/sanding spalted woods. The coloring evident in Spalted (from the German word "spoiled") wood results from fungus/mold intrusion. Basically, it's beginning to decompose. If you turn woods that's spalted, your throwing minute particles of mold and fungus into the air. Breathing in ANY dust for pronged periods isn't good for you. But there is a 1 in 10 chance that you might have a allergic reaction. This goes DOUBLE for Exotic woods like Bubinga, Lacewood, Ebony, or Coccobolo. Mark Kauder passed along a little saying to me that sums it up nicely. "There are 2 kinds of people out there. Ones who are allergic to Coccobolo, and ones who will be"
You're already on the right track in thinking that a mask will help. Wearing a good quality mask is a good idea. As you've been told, the El-Cheapo masks are next to useless. Dust-B-Gone makes a pretty nice mask. I believe it's washable as well.
I would suggest using a (3) pronged approach to control the dust.
Catch as much dust as possible at the source (before it's thrown into the air). Build or buy yourself a shroud for your DC that can be positioned at your lathe near the work. I made mine out of 4" PVC and an old office chair base (picture attached). You'd be surprised at how much dust something simple like this will catch. When I sand a bowl, I can see the dust being sucked into the shroud (it doesn't get all of it. But it does catch quite a lot).
Build or buy yourself an Air Filter. These will circulate the air in the shop and filter the fine particles out of the air. I believe the Delta I have is rated to to 6 to 8 air changes (completely circulate the air) per hour. These devices are more useful after you've stopped turning/sanding. Many come with a timer you can set. They're meant to catch the dust before it settles, and can be kicked up again when you start working.
And the last one (which you already know about)Use a mask.
Sorry to be so long winded. But dust collection is something I take seriously.
See ya around,

Dominic
