Reply by jmos

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Posted on dust collection

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869 posts in 2519 days

#1 posted 02-13-2014 01:58 PM

If you are able to change the port on your tablesaw, I’d take it up to at least 6” round. My Jet tablesaw had a plastic cover with a 4” port molded into it. I made a new plywood cover, that used the same fasteners as the stock one, with a 6” hole and stuck my DC pipe into it. Worked great with no flex required. Even if you had to cut some sheet metal to do it, it would help. Some tools it’s just not possible to modify, like my band saw, and you just have to do what you can.

As MJCD said, any 4” will provide a choke point and drop your flow and create a pressure drop. Likewise, minimize the amount of flex hose; the interior of the flex hose is much rougher than any sort of pipe, and will have a much higher pressure drop per foot. Use the shortest length you can get away with. Hard pipe is much better than flex from a pressure drop standpoint. Likewise, avoid sharp angled turns; an abrupt 90deg turn creates a lot more turbulence and pressure drop than a gradual 90deg turn.

-- John

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