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wood-dust-collection-requirements-guide Guide Wood Dust - Free download as PDF File .pdf), Text File .txt) or read online for free.  The average inhalable wood dust in the breathing zone of the worker must not exceed the OES over an eight hour working shift. Where dust from timber that has been coated with a toxic substance (such as lead paint) is involved, the OES for both the toxic coating and wood dust must be complied with. Formaldehyde readings should be below 1ppm (one part per million) when averaged over an eight hour day. Short term exposures should not exceed 2ppm. Who is at risk? People exposed to wood dust at work are at greater risk of developing nose, sinus, throat, lung, and skin conditions. • Making An Automatic Dust Collection System; Shopmade #  DIY Wood Guy. • тыс. просмотров 2 года назад. Циркулярный стол своими руками из паркетки и фанеры (полная хронология). Wood processing causes small particles of wood dust to become suspended in the air. Workers can inhale these particles. A person’s upper respiratory system can filter out the larger particles, but smaller particles can go deep into the lungs causing damage and scarring to the lung tissue.  Advise workers to wear respiratory protection equipment (RPE) when emptying vacuum cleaner bags or collection bags – there is a potential for high wood dust exposure. Ensure workers wear RPE and other personal protection equipment (PPE) suitable for the task. Advise workers to remove work clothing such as overalls carefully at the end of the task or shift to avoid generating dust clouds. To requiremenfs this you total the Static Pressures of the following system component groups:. Note: If a non-primary machine or pick-up is added to the system between primary machines, the size of the run is not increased. For the purpose of the following examples assume woodworking dust. Record any reducers or rectangular to round transitions on your take off list. Wood dust collection requirements guide Subscribe Magazine Customer Service. When an ad says a collector is rated yuide 1, cfm, what does it mean?

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. The Oneida comes without cable or switch. It can be wired to run on either current. A 2-hp unit can sometimes handle two machines at once Hooked up to two 6-ft.

When I connected the 2-hp units to the PVC duct system, they too were robbed of considerable power, but one machine could be operated at a time with satisfactory results. When connected to a metal duct system, the Jet collector really moved a lot of air, cfm at the tablesaw-jointer connection after about 25 ft. With two blast gates open, the air volume was reduced to less than cfm, still acceptable for some operations.

The Dust Boy produced slightly lower readings but still had more than enough power to run one tool at a time in any configuration. If you regularly operate more than one machine simultaneously, it would be wise to look at 3-hp or bigger dust collectors. They cost more, however. Most 2-hp collectors come wired for volts. The Dust Boy can be run at either volts or volts. On the matter of choosing a dust collector, a two-stage cyclone gets my top vote.

A small cyclone collector takes up less room, is easy to empty and runs very clean. For example, on all of the single-stage units, even after running them for only an hour, fine dust appeared on the machine and in the area around it. 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 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 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. Jet - Cyclonic Separator Kit. View All Dust Collection.

You must be logged in to write a comment. Log In. Find a Store. My Account. My Cart. Go to Home Page. Mobile Navigation. The 26x28' space, shown in the opening photo above , and in the floor plan, below , provides John a place to pursue his hobby when not working as a ranger at a nearby state park.

All the dust-producing machines attach to the dust-collection system. A broom and floor sweep take care of other dust. John built his system using off-the-shelf components, and was happy with its performance. We knew the system worked, but we wanted hard data to see its strengths and weaknesses.

To save space and reduce noise, John installed the collector in a shed attached to the shop, shown in the photo below. He ran the main duct through a hole in the wall, just below the peak of the vaulted ceiling. A shed houses the dust collector outside the shop. The large bags on the left are oversize, 1-micron units; at right, the collector's stock micron bags. Placing the dust collector outside the shop brought another benefit.

To capture them before the air returns to the shop, John cut holes in the wall that separates the shed from the shop, and added frames that hold four high-efficiency furnace filters. To reduce the number of long duct runs, a 5" section does double duty, serving the 15" planer and a 4" branch to the jointer. Compared to the tee installed , a wye and adjustable elbow provide smoother transition from a branch to the main duct.

With stock filter bags, it musters only cfm. Jeff agreed that mounting the collector outside the shop saves space and reduces noise. Replacing the micron bags with 1-micron bags would eliminate the small dust, and make the filters unnecessary. John also could install a cyclone system in place of the current collector.

A cyclone captures the big chips and most of the fine dust in an easy-to-empty tub. That means the motor can pull more air and produce more of its potential power, as demonstrated by the increased amp draw.

Jeff Hill inserts a pitot tube into the main duct to measure airflow. Opening various gates allows whole-system readings from one location. That allowed Jeff Hill to insert the pitot tubes for two different gauges: one that measured airflow in cubic feet per minute cfm , and one to check static pressure sp , as shown in the photo above. See the results in the table following. Next, we closed off all gates except the radial-arm saw to determine maximum flow farthest from the collector.

Performance was adequate everywhere but at the bandsaw. The second set reflects the impressive improvements made by installing 1-micron polyester felt bags. Because the price was right, John used HVAC furnace-style pipes to create the ducts in his dust-collection system. All the pieces consist of and gauge galvanized steel.

Never use lightweight gauge or dryer-vent pipe. Even a modest collector can do them in. Where ducts intersect and turn, John used short-radius elbows and tee fittings designed for HVAC use. These increase resistance in the system, preventing it from moving all the air it could. Fittings designed for dust collection would get the most from his collector, or possibly allow using a smaller one. The radius of HVAC elbows usually equals pipe diameter 1x.

Where pipes join, wye fittings allow air and chips to flow through the transition with little turbulence. Sharing duties reduces duct length. Here, one 5" branch serves the tablesaw, floor sweep, and a 4" pipe to two sanders.

Blast gates direct airflow to just the ports in use. At another point on the main, a 5" branch feeds in from the planer with a 4" offshoot to the jointer.

All other branch lines are 4" diameter. John connected all of his machines to the ductwork using flexible hoses. In most cases, the flexible hoses are less than 3' long. A 2" hose restricts bandsaw duct pickup. Options for improvement include a 4" hose with a reducer or making a 4" port. Our expert says: The long, small-diameter hose greatly reduces the cfm of airflow at the bandsaw, yielding marginal dust pickup.

Always run the largest appropriate hose as far as possible, then reduce it to a smaller port size only at the end. Better yet, modify the machine, if you can, to accept a larger port. But this case proves that, if you understand the basics, you can control workshop dust. Thankfully, you can build a great system following a few rules of thumb:.

Note: The following rules may yield a system with more power than you actually need, but too much power is better than too little. Plus, an oversized system can handle future expansion. Start the process by determining how much air your tools need. The collector you choose in step three will influence this as well.

Plan the shortest, straightest runs you can because every bend and foot of duct adds air resistance, known as static pressure loss, shown in Chart 2 , below.

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