It is good to hear that there is continuing research on this important topic. Every foot of ductwork adds friction to the airflow, creating resistance, as do changes in duct direction, a reduction in duct diameter, and the rough surfaces of flex hose. I have not finalized tool locations so I am flexible on arrangements and laying out a collection system. Friends of Woodcraft. I just bought a dust collector dust system for woodshop jp 4 in. Ensure that each machine is continuously grounded to the dust collector frame with a ground screw, as shown in Figure

The Oneida cyclone, outfitted with an internal filter, rubber gaskets and wide metal ring clamps, seals better. Two-stage units such as the Dust Boy Delta also makes a two-stage collector are also nice and compact. The Dust Boy takes up 6 sq. The Dust Boy as does the Oneida comes with a Leeson motor and cast-aluminum housing and impeller fan , and the sturdy plastic barrel holds a lot of debris, 55 gal.

Before it can be emptied, however, the heavy motor and housing must be lifted off. Removing the lower bag of a single-stage collector is Dust Collector System For Woodworking Shop an easy matter of loosening a band clamp. The real fun begins when you try to reattach it. The lower bag must be wrapped around the metal waist of the machine and held in place before the clamp can be cinched. Some manufacturers, such as Jet, add an elastic band inside the lower bag to facilitate reattachment somewhat.

The skirt and a standard gal. I just wish the skirt were made of felt rather than the more porous woven fabric. This setup will reduce the air volume. When an ad says a collector is rated at 1, cfm, what does it mean?

Not much, really. Cfm stands for cubic feet per minute, a measure of the volume of air moving past a point of reference. The cfm figure needs to be put in the context of the amount of resistance, or friction, present called static pressure, or SP.

Air moving through duct or hose encounters resistance, just as a person would slipping down a water slide. The more bends and bumps, the slower the ride or the lower the air velocity and volume. Many manufacturers rate their machines without bags or duct attached. While trying out a number of dust collectors, I measured their performances under real working conditions, using flexible hose, PVC pipe or metal duct in my sq.

I also measured collectors hooked up to a straight piece of 6-in. Collectors ranging in size from 1 hp to 2 hp have impellers fans sized from 10 in. All things being equal motor speed and impeller design , a bigger impeller coupled with a bigger motor will move more air than a smaller pairing. There are some differences among collectors; to learn more, ask a manufacturer for an impeller performance chart.

As soon as any collector is hooked up in the shop, performance declines in relation to the length and type of hookup. Materials that affect airflow. The metal elbow top , which is designed for central dust-collection systems, has a gentle sweep, which lowers resistance to airflow.

Plastic PVC pipe has a tighter-radius bend and restricts airflow more. Ribbed flexible pipe also disturbs airflow, up to three times as much as metal. Hooked up to two 6-ft. With a larger upper bag, I found that the cfm readings were not compromised. But if you happen to vacuum up any offcuts, they will make quite a racket rattling around in a metal trash can.

Although many woodworkers, myself included, have used PVC drainpipe for duct without mishap, experts warn against using the material. The connectors elbows and wyes restrict airflow, and Dust Collection System For Woodshop the material builds up a static charge, which may cause a spark and set off an explosion. Running grounded copper wire inside the pipe reduces the hazard. Use PVC at your own risk.

Metal duct and fittings are obviously better and will also last longer. Your collector will work more efficiently, and so will you. Quick View. Add to Cart. Jet - Vortex Cone Dust Collector, 1. View All Dust Collection. You must be logged in Dust Collection System For Garage Floor Effect to write a comment.

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