Determining Main Line Duct Size

The general rule of thumb for a main line duct is that the velocity of the airflow must not fall below 3500 FPM.

For small/medium sized shops, using the inlet size of the dust collector as the main line duct size will usually keep the air velocity above 3500 FPM and, depending on your system, will allow you to keep multiple branches open at one time.

For the Model G0637/G0638 this is 10". Mark your drawing as in Figure 52.

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Figure 52. Main line size labeled on sketch.

Determining Branch Line Duct Size

The general rule of thumb for a branch line duct is that the velocity of the airflow must not fall below 4000 FPM.

For small/medium sized shops, using the dust port size from the machine as the branch line duct size will achieve the correct velocity in most appli- cations. However, if the dust port on the machine is smaller than 4", make the branch line 4" and neck the line down right before the dust port.

Note: Systems with powerful dust collectors work better if multiple blast gates are left open. This also allows you to run two machines at once. Experiment with different combinations of blast gates open/closed to find the best results for your system.

Write your determined branch line sizes on your drawing, as shown in Figure 53.

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Figure 53. Branch line sizes labeled on sketch.

A few frequently asked questions when deter- mining branch line sizes:

What size of branch line do I use if the machine has two dust ports?

Simply add the total CFM given for each size from Figure 49 and refer to that CFM number in Figure 54. Then, split the branch line just before the dust ports with matching duct sizes.

How do I manage two machines on the same branch line?

You have two options:

1.If both machines will be running at the same time, add the total CFM given for each size from Figure 49 and match the branch line given in Figure 54.

2.If both the machines will never be run at the same time, reference the machine with big- gest dust port in Figure 54 and add blast gates after the Y-branch to open/close the line to each machine.

Total CFM	Branch Line Size
600	5"
700	5"
800	6"
1000	6"
1200	7"
1400	8"
1600	8"

Figure 54. Branch line sizing chart by total CFM (for use when multiple machines share line).

G0637/G0638 Cyclone Dust Collector

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.

Another notable characteristic of both models is their user-friendly design. The height adjustment knobs are conveniently placed for easy access, allowing users to quickly adjust the cutting height without disrupting workflow. Additionally, both machines are equipped with oversized handwheels that enable fine adjustments, ensuring that every cut meets precise specifications.

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.

Grizzly G0637, G0638 Determining Main Line Duct Size, Determining Branch Line Duct Size

Models: G0638 G0637