Originally Posted by
Chris Parks
For a start that 1250CFM is not 1250 as every manufacturer embellishes their flow numbers but a very few do not state them because measuring flow is like rounding up a herd of cats.
A saw, any saw generates both fine and heavy dust and mitre saws are one tool that have to be in a housing and a very high flow extractor used to capture the fine dust. The standard port captures the heavier dust to some extent but the fine dust that results from cutting does not get captured very effectively and ends up floating around the operator which is not good. My mitre saw is in a housing that comes back to the fence and the extraction is done by a CV1800 running at 75hz and it still does not capture all the fine dust just most of it.
Alan, I know you are very aware of dust issues but mitre saws are a very difficult tool to effectively capture all the dust. There are a large number of videos on YT but most of them do not use a big enough DE and very few of them use 6" ducting which is the absolute minimum and given a capable extractor a larger diameter would be better.
Thanks, Chris. Informative as always. Yes, I know, 1250CFM is overstated. But running a 6" hose to the shroud I'm building is better than 4" or 2.5". I'll get somewhat more flow that way.
I have agreed with the sentiment above and will be using both the Festool vac and the Rockler DC with a 6" hose to the shroud. I know this will not get all the small dust, but I'm hoping it will make a substantial dent in it.
FWIW, I now have a Grit Automation Dust Collector module hooked up to the Festool, and both my Jet 1000B and Jet 2000 turn on for several minutes when I use the Kapex. But they are in the middle of the shop, and the Kapex is at the end, so it must take them time to clear the small airborne dust. I have another Grit Automation module to hook up to the Rockler DC. Not sure how I'll get both to turn on. Time to run that by Joel at Grit Automation. I'm sure that's a way.
So, when completed, I'll have the Rocker DC and the Festool Vac, as well as two overhead air cleaners turn on when I use the Kapex. Certainly overkill, but also, sadly, I'm sure not totally effective. Let's see how the shroud does. I think that will help a lot. I'll post pictures when completed.
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