Wood Magazine 198 by Bill Krier

Author:Bill Krier
Language: eng
Format: epub
Tags: Wood, Home and hobby woodworker
Publisher: Meredith Corporation
Published: 2010-03-25T04:00:00+00:00

A more gentle arc creates less resistance, but you can do better.

A shallow bend reduces static pressure resistance and improves airflow.

GIVE DUST A STRAIGHT SHOT TO THE COLLECTOR

POOR

Two 90° bends

BETTER

□

Two 45* bends

BEST

The 90° elbows in the dust-collector setup {left} add turbulence and resistance. Two 45° bends {center) reduce resistance, but a straight run into the inlet port {right) works best.

Buy enough suction power

GRADE COLLECTORS ON A CURVE

To choose a dust collector that will handle your shop's future requirements, you first need to know which tool in your shop (or on your shopping list) needs the greatest airflow to pull away dust and chips. Because every foot of pipe and each fitting adds resistance to that airflow, you also need to know the amount of static-pressure loss between the collector and that tool. With your workshop layout and dust-collection system map in hand, use the charts on the next page to guide you from your floor plan to the collector you need.

Once you have both numbers, you're ready to shop. Skip references to "free

air"

or "maximum" cfm, and check manufactured literature and Web sites for performance curves like the example at right (For head-to-head comparisons of several manufacturers' products, go to woo dm agazi ne.com/cyclones.)

Manufacturers' curves may show how the system performs under ideal, carefully controlled conditions with a new, clean filter. Time and real-world use may-lower a unit's actual performance, so opt for the next collector size up from what you've calculated you'll need. That way, no matter how far woodworking takes you, it won't leave a trail of sawdust along the path.

u

1/1

'— C_

u '-•-J 03

12 10 8 6 4 2 0

200 400 600 800 1,000 Standard Cubic Feet oer Minute

Trace a horizontal line from your system's static-pressure total {9" in this example) and a vertical line up from your most-demanding tool's CFM requirement (575 cfm). If they meet on or u nder the curve, that collector has the power you need.

60

WOOD magazine July 2010

www.WorldMags.net & www.Journal-Plaza.net

Estimate your dust-collection needs

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