Grizzly G0638, G0637 owner manual Calculating Duct Resistance

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Calculating Duct Resistance

Adding duct work, elbows, branches and any other components to a duct line increases airflow resistance (static pressure loss). This resistance can be minimized by using rigid (smooth) pipe and gradual curves, as opposed to flexible pipe and 90˚ elbows.

To help you think about this resistance, imagine riding a bicycle in a tunnel that is an exact replica of your duct work. If the inside of the tunnel is very bumpy (flexible pipe) and has many sharp turns (90˚ elbows), it will take a lot more effort for you to travel from one end to the other than if your path had been smooth and straight.

The purpose of calculating this resistance is to determine if it is low enough from the machine to the dust collector to meet the given requirement for the machine. Use the charts in Figure 55 to calculate the resistance of duct work.

Duct

Approximate

Approximate

In most small/medium shops it is only necessary to calculate FPM for the line with the longest duct length or the most fittings (operating under the assumption that if the line with the highest resis- tance works, the others will be fine).

To calculate the static pressure loss of any given line in the system, follow these steps:

1.Make a list of each size duct in the line, including the length, and multiply those num- bers by the static pressure loss value given in Figure 55.

2.List each type of elbow or branch and multiply the quantity (if more than one) by the static pressure loss given in Figure 55.

3.Add the additional factors from Figure 56 to your list.

Additional Factors Static Pressure Loss

Seasoned (well used)

Dia.

Static Pressure

Static Pressure

 

Loss Per Foot of

Loss Per Foot

Dust Collection Filter

Entry Loss at Large

1

Rigid Pipe

of Flex Pipe

Main

Branch

Main

Branch

Machine Hood

2

 

Lines

Lines

Lines

Lines

 

at 3500

at 4000

at 3500

at 4000

 

FPM

FPM

FPM

FPM

2"

0.091

0.122

0.35

0.453

2.5"

0.08

0.107

0.306

0.397

3"

0.071

0.094

0.271

0.352

4"

0.057

0.075

0.215

0.28

5"

0.046

0.059

0.172

0.225

6"

0.037

0.047

0.136

0.18

7"

0.029

0.036

0.106

0.141

8"

0.023

0.027

0.08

0.108

9"

0.017

0.019

0.057

0.079

Fitting

90˚

45˚

45˚

90˚

Dia.

Elbow

Elbow

Wye(Y)

Wye(Y)

3"

0.47

0.235

0.282

0.188

4"

0.45

0.225

0.375

0.225

5"

0.531

0.266

0.354

0.236

6"

0.564

0.282

0.329

0.235

7"

0.468

0.234

0.324

0.216

8"

0.405

0.203

0.297

0.189

Figure 55. Static pressure loss charts.

G0637/G0638 Cyclone Dust Collector

Figure 56. Additional factors affecting static

pressure loss.

4.Total your list as shown in the example in Figure 57 to come up with your overall static pressure loss number for that line.

Note: Always account for a seasoned filter, so you don't end up with a system that only works right when the filter is clean.

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Figure 57. Example list for totaling SP loss. -33-

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Contents Model G0637 71/2 & 10 HP Cyclone Dust CollectorsPage Table of Contents Contact Info IntroductionForeword G0637 Machine Data Sheet G0637 Data Sheet G0637/G0638 Cyclone Dust Collector G0638 Machine Data Sheet G0638 Data Sheet G0637/G0638 Cyclone Dust Collector Identification G0637/G0638 Cyclone Dust Collector G0637/G0638 Cyclone Dust Collector Additional Safety for Dust Collectors Full Load Amperage Draw Phase ConverterConnection to Power Circuit RequirementsTo convert the G0638 to Model G0637 440V ConversionModel G0638 440V Conversion Unpacking SetupSetup Safety Items Needed for SetupInventory Qty InventoryInventory Figures Qty Lighting Placement LocationSite Considerations Floor LoadBolting to Concrete Floors Clean UpMounting to Shop Floor Hardware Identification Chart Upper Stand AssemblyIntake Barrel and Large Cyclone Funnel Intake Cylinder and Blower HousingCyclone mounting bracket mounted To collector assembly Blower Housing and Intake Barrel AssembliesSecuring intake barrel assembly to Blower housing assembly Outlet Port and Canister Filters Canister filter collection bag installed Dust Collection Drum Assemblies Small Cyclone Funnel and Funnel PortPage Model G0638 Control Box Model G0637 Control BoxFor the G0638 only Test RunTo test run your dust collection system Metal Duct Designing SystemGeneral Duct MaterialPlastic Duct Flexible DuctSketch a Basic Duct Layout System DesignDecide Who Will Design Sketch Your Shop LayoutMachine Determine Required CFM of Each MachineMachine Approximate Total CFM Branch Line Size Determining Main Line Duct SizeDetermining Branch Line Duct Size Calculating Duct Resistance System Grounding Blast Gate Metal Duct Starter Kit AccessoriesG6252-4 Floor Sweep G7341-5 Floor Sweep G7342-6 Floor Sweep Metal ElbowsMetal Branches Reducers & AdaptersH2443-Universal Adapter Dust collection pipe clampsOperations Operation SafetyRemote Control Emptying Drums MaintenanceCleaning Filters ScheduleMotor & Electrical ServiceTroubleshooting Dust Collector Operation Symptom Possible Cause Possible SolutionDate Approximate Hours Of Use Service Performed Service LogModel G0637 control box G0637 Electrical ComponentsWiring Diagrams Pages 44 Model G0638 control box G0638 Electrical ComponentsPages 47 Pages 47 Parts Breakdown Description Parts ListCollection Drum LID Label Placement Warranty and Returns Page Page
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G0638, G0637 specifications

The Grizzly G0637 and G0638 are two robust woodworking machines designed to cater to both amateur woodworkers and seasoned professionals. These models stand out for their precision, durability, and versatility, making them ideal for various woodworking applications.

One of the main features of the Grizzly G0637 is its powerful 3 HP motor, which provides ample power for cutting through different types of wood with ease. This capability makes it suitable for heavy-duty tasks, including jointing and planing thick lumber. On the other hand, the G0638 model boasts a twin-knife cutterhead for enhanced efficiency, providing smooth finishes and improved stock removal rates. This feature is particularly useful for woodworkers who require high-quality outputs in less time.

When it comes to technology, both models incorporate advanced engineering principles to ensure operational stability. The Grizzly G0637 features a precision-ground cast-iron table designed for flatness, contributing to accurate results. This table is also fitted with an integrated dust collection system, which helps maintain a clean workspace by minimizing sawdust accumulation during operations. The G0638 model enhances this design with a spiral cutterhead, featuring multiple carbide inserts that provide a cleaner cut and longer life than traditional blades.

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Safety is another important aspect of the Grizzly G0637 and G0638 models. Each machine includes features such as anti-kickback pawls and blade guards, which promote safe operation while handling various stock types. The solid construction of these machines also minimizes vibrations, further enhancing stability and safety during use.

In conclusion, the Grizzly G0637 and G0638 represent the pinnacle of woodworking machinery, combining power, precision, and user-friendly features. Their innovative technologies and solid construction make them a valuable addition to any workshop, allowing woodworkers to achieve exceptional results in their projects. Whether you're jointing edges or planing surfaces, these machines are designed to enhance performance and elevate craftsmanship.