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wood-dust-collection-design-online Search Go. I combined a cyclone with a bag style dust wood dust collection design online and placed both in the room next to my shop to keep the noise level down. When an ad says a collector is rated at 1, cfm, what does it mean? Any guidance would be collectikn. Make your duct runs straight and direct with as few turns as possible.

The horsepower rating is a fairly reliable guide to the performance of a dust collector see the chart on p. Hookups, however, are everything. Too much flexible hose will rob even a big collector of power. Metal duct, not unexpectedly, performs best. Even an 8-year-old, 1-hp col-lector can collect chips from machines 25 ft.

Every shop is different, of course, and your results may vary, so use my findings as guidelines, not absolutes. A 1-hp single-stage collector can handle any machine in my shop The biggest sawdust producer in my shop is a in. And even a 1-hp singlestage dust collector can handle that machine, hooked up with about 6 ft.

I borrowed a new UFO, same as my old collector, to see if anything had been changed. Some woodworkers buy two units and station them strategically in their shop. At 82 decibels measured at 8 ft. The most economical and biggest-selling dust collectors are the two-bag, single-stage models. Single stage means the dust is sucked through the impeller fan and dumped into the lower bag. The upper bag collects fine sawdust and lets the exhaust air back into the shop.

Two-stage collectors are the next step up. The motor and impeller sit atop a barrel. Chips enter the barrel and are directed downward, although the swirling air inside may occasionally move smaller chips upward. A filter bag hangs off to one side and collects the finest dust. Two-stage cyclones are at the top of the evolutionary chain. The motor and impeller sit atop a cone-shaped canister, the cyclone, which is connected to a trash can below. Chips or other large debris enter the cyclone and swirl downward, avoiding the impeller.

The longer the cyclonic chamber, the greater its effectiveness at slowing down and separating large particles. Air is filtered either by a pleated internal cartridge or by one or more felt bags hanging off to the side of the machine. Internal-cartridge cyclones use the least amount of floor space. The upper bags or cartridge filters of all collectors must be shaken out occasionally to remove fine dust. Debris entering a single-stage collector passes through the impeller, many of which are made of steel.

Even a small bit of metal, such as a screw, can cause a spark when it hits a steel impeller. Dust-collector explosions are rare, but the potential is there. Debris, metal or otherwise, not only makes a racket when it hits an impeller but also imparts stress on the bearing and will shorten its life.

One way to reduce the risk of fire is to choose a single-stage collector with a plastic or aluminum impeller. Steel impellers are fine, however, if you avoid using the dust collector to sweep up miscellaneous debris off the floor or workbench. I also used the 1-hp collector with a PVC duct system 4-in. At that distance, because of increased resistance, the air volume drops to under cfm, less than recommended for woodworking tools.

In reality, however, one can live with that. When I hooked up the 1-hp collector to a newly installed metal duct system, with my tools in the same configuration as before, I was really surprised.

The air volume was back up to cfm, very acceptable. Then I hooked up my old 1-hp collector, which is outfitted with oversized felt bags available from Oneida Air Systems that improve airflow and capture fine dust , and I measured almost cfm.

Hooked up to a 6-ft. Cyclones and two-stage collectors have slightly more internal air resistance; hence the lower cfm reading. Performance ranged from good to so-so, depending on how much sawdust was being spit out by my tools. The best way to direct maximum airflow to the tool being used is to attach a blast gate to each hose. Hooked up to a PVC duct system a run of about 25 ft. A two-stage unit such as the Oneida costs almost twice as much.

Penn State Industries also sells a cyclone collector. With two blast gates open, the air volume dropped and was insufficient to operate two big machines at once. More horsepower does mean more noise; both registered 85 decibels at 8 ft. The Delta comes wired for volts but can be switched over to volts.

Your total CFM requirement is the total of all primary branches. When not using a primary machine you will close blastgate and divert suction to a secondary machine. If you are installing an indoor re-circulating dust collector you need not calculate any more duct diameters.

If you are attaching ductwork to the exhaust side of your duct collector it is accepted practice to use a duct diameter two diameters larger on the exhaust side than on the inlet side, thus minimizing exhaust and duct resistance. Inches Water Gauge. If clean air return duct is required, duct resistance should also be calculated.

Now you have all the information you need to make an educated decision in purchasing your dust collector. To develop your list of materials required, go through the system; this time starting at the dust collector and list each part you will need.

To order please call: ; fax: ; or order online. If you have any questions while you are designing your system give us a call. Remember Me. There are two phases to designing your dust collection system: The first phase is sizing your duct work for adequate volume and velocity of flow for the type of dust you will be creating; and the second phase is computing the static pressure SP of your system to determine the size and power of your dust collection unit.

Prior to making your calculations, diagram the floor plan of your shop to scale on graph paper. Include the size and location of each machine, and the location of its dust port or outlet; the floor to joist dimension; the location of the dust collecting unit; and the most efficient fewest number of turns or bends path for routing your duct lines. This is also a good time to start your take-off list of duct components for your system. Below this minimum FPM, particles will begin to settle out of the air stream, forming clogs—especially in vertical runs.

Table see below shows the minimum FPM that Spiral Manufacturing recommends for several types of dust in branch and main runs.

From the Table determine the velocity FPM of your system for the type of dust that will be produced. For the purpose of the following examples assume woodworking dust. Determine the diameter of each branch line. You can use the diameter of a factory installed collar or port, or consult the manufacturer. Convert metric ports to the nearest inch. Convert rectangular ports to the equivalent round diameter.

Record any reducers or rectangular to round transitions on your take off list. Using Table , determine the CFM requirement of each branch. Remember the FPM for wood dust in branch lines is Identify your primary or high-use machines.

These are the machines that operate simultaneously on a frequent basis.

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