I used the original bags for a while, but a couple of winters back, varmints got into my DC shed and decided even with the dust, the bags would make good nesting material or I had chips that flew into the sides and made holes... but I replaced them with a felt type bag I got off line... that must have made even better nesting material... I opened the shed to check on why I wasn't getting much draw and discovered I had huge holes in my bags and dust an inch thick in the shed... I replaced them with better bags I got on line and don't have quite as much dust in the shed.... I have my DC installed in a shed outside the shop and plumbed through the wall, so I could cut down on the noise and any dust coming through the bags, but I'm still not drawing all the dust off the lathe when I sand...
Tellico Plains, TN
My parents taught me to respect my elders, but it's getting harder and harder to find any.
If you go looking for trouble, it will usually find you.
DC is more than just CFMs, clearly the volume of air your unit can move will dictate how large a "system" of pipes you can use/run and still COLLECT DUST. And Dust Collection (the real goal) is more important than chips. To collect dust - it MUST remain suspended so it can be moved through your pipes into a collection bag. This little bit of magic requires VELOCITY. In order to keep dust suspended it must travel at or near 4000 feet per minute, or it will not make the run. Each foot of pipe regardless of size (don't get me wrong size affects velocity) creates resistance that slows the rate of air flow. This seems to be a nagging problem for fellow woodworkers so I will try to find my notes and see if I might be able to help. It means calculating the volume of air in the active (the ones connected to the tool(s) in use) pipes and the effect of every bend as well. Maybe I am making this too involved - does anyone really care about the physics of all this - - - IF so I will work on it. BILL
well bill, i think i got my problem fixed, but i do have a question for you.. the speed at which air is leaving my outlet pipe, does that represent the inlet speed or could inlet be less ? i dont use a bag it goes directly out side.
If in Doubt, Build it Stout!
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If your outlet is a reasonable length of pipe (say 2'+ or so) it removes ~most of the chances of getting false readings due to turbulence or dead spots from weird exit airflow patterns (or simply move your measurement device around the opening and if it reads the same at multiple spots its probably ok )