dust collection

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Forum topic by Jesse posted 01-22-2015 02:10 PM 809 views 0 times favorited 1 reply Add to Favorites Watch
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58 posts in 1862 days

01-22-2015 02:10 PM

I have a newer Grizzly 3HP dual canister dust collector with a 7 inch inlet. How long of a main run would be acceptable for a machine this size without losing too much suction? There is very little horizontal branches off the main trunk, it mostly goes from the main trunk straight down to the machines which all have 4” ports. I also have smooth wall metal pipe so I don’t lose airflow due to bad piping. Any help is appreciated. Thanks!

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View Fred Hargis's profile (online now)

Fred Hargis

5234 posts in 2729 days

#1 posted 01-22-2015 02:36 PM

Jesse, it’s hard to say. In your other post you mentioned 50’ (I think). I have a 32’ straight run (6”) on mine, and I believe it could go 50’ without too much loss. But if your bags clog, the air flow will drop, and you could wind up not moving enough air. It would also depend on what’s feeding the air flow, I though you mentioned you had a 7” trunk, and then you choke down (those are the correct words) to 4” at the machine. 4” may not allow enough air to keep particles suspended in a 7” trunk. So here’s what I think: you were asking about a CNC (right?), I would run the ducting to it keeping at least 6” all the way to the tool (part of the plan, as I recall). It may not be enough to capture all the finest dust, depending on the hood and some other stuff, but it should work. I also suggest you open the other tools up to 6”, even if it means cutting holes, replacing parts, or whatever. Someone can do the exact SP calculations, and it still might be different on your set up, trying it out is about the best approach. Is there a way to move the DC a little more central, relative to the CNC? Also, I doubt you will have to upgrade that DC, it does have plenty of air flow for what you need (I think).

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