<div dir="ltr"><div><div>Seems like for the CNC plasma cutters, a lot of people are really recommending a water table as being far more effective at eliminating the dust and smoke. See this thread, for example:<br><br><a href="http://www.pirate4x4.com/forum/torchmate-cnc-forum/1005868-health-concerns-regarding-plasma-dust.html">http://www.pirate4x4.com/forum/torchmate-cnc-forum/1005868-health-concerns-regarding-plasma-dust.html</a><br><br></div>Something to keep in mind...<br><br></div>Patrik<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 27, 2016 at 1:16 PM, Jake <span dir="ltr"><<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">please see my last post about the ventilation plan.<br>
<br>
as for eye protection, as long as people don't stare at the arc without eye protection it shouldn't be a problem. That said, if people want to make a welding curtain like Crucible uses, it's not a terrible idea:<br>
<br>
<a href="http://goffscurtainwalls.com/sites/default/files/styles/slideshow_display/public/ssimages/Weldscreen.JPG?itok=7_mJcT7d" rel="noreferrer" target="_blank">http://goffscurtainwalls.com/sites/default/files/styles/slideshow_display/public/ssimages/Weldscreen.JPG?itok=7_mJcT7d</a><br>
<br>
by the way, here's a picture of the plasma cutter:<br>
<br>
<a href="http://i.imgur.com/Y31qhDs.jpg" rel="noreferrer" target="_blank">http://i.imgur.com/Y31qhDs.jpg</a><div class="HOEnZb"><div class="h5"><br>
<br>
On Wed, 27 Apr 2016, Patrik D'haeseleer wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
We should definitely disallow cutting of any stainless steel, which causes dangerous hexavalent chromium dust. For those of you with the blank stares, hex chromium is the<br>
pollutant linked to dozens of cancer cases in the Erin Brokovich movie, a dramatized account of an infamous case where PG&E wound up paying out a third of a billion dollars<br>
in damages.<br>
<br>
We should probably ban any galvanized metals as well. Zinc fumes are nasty. Nickel in stainless steel is a concern as well. So is the cadmium and manganese in some grades of<br>
steel.<br>
<br>
The upshot is that we probably shouldn't be doing any plasma cutting without some serious ventilation. And eye protection of course - a welding curtain or screen might be<br>
good to have.<br>
<br>
Patrik<br>
<br>
PS: We've been discussing the possibility of doing water testing for metal contaminants in CCL. But having a plasma cutter spewing metal oxides into the air on the other<br>
side of the room may very well make that impossible...<br>
<br>
On Wed, Apr 27, 2016 at 2:26 AM, Marc Juul <<a href="mailto:juul@labitat.dk" target="_blank">juul@labitat.dk</a>> wrote:<br>
<br>
<br>
On Wed, Apr 27, 2016 at 1:44 AM, Jake <<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>> wrote:<br>
BUMP<br>
<br>
we got the plasma cutter working! But the air compressor is still messed up. We took it apart three times trying to fix the check valve, but it<br>
simply didn't work.<br>
<br>
<br>
I love plasma cutters but how are we going to safely use one indoors? I'm not sure anyone wants to breathe clouds of metal oxides:<br>
<br>
<a href="http://www.hgcodedwelding.com/hg-coded-welding-blogs/plasma-cutting-danger" rel="noreferrer" target="_blank">http://www.hgcodedwelding.com/hg-coded-welding-blogs/plasma-cutting-danger</a><br>
<br>
--<br>
marc/juul<br>
<br>
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</blockquote>
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