ADJUSTING LOWER BLADE GUIDES AND BLADE SUPPORT BEARING

Adjust the lower blade guides and blade support bearing after the upper guides and bearing have been adjusted.

DISCONNECT MACHINE FROM POWER SOURCE.

1.Adjust the front edge of the guide blocks (B) Fig. 56 so that they are just behind the “gullets” of the saw teeth. Turn the knurled knob (C) Fig. 56 to make this adjustment. Check the support bearing (D) Fig. 56. It should not be touching the back of the blade.

2.Loosen the two screws (A) Fig. 56. Move the guides

(B) as close as possible to the side of the blade, being careful not to pinch the blade. Tighten screws (A).

3.Turn the other knurled knob (E) to adjust the lower blade support bearing (D) Fig. 56 so that it is about 1/64" behind the back of the blade.

E

 

B

A

A

 

 

 

B

C

D

Fig. 56

OPERATIONS

Before starting the machine, insure that all adjustments are properly made and the guards are in place. Turn the upper wheel by hand to make sure that everything is correct BEFORE turning on the power.

Keep the top blade guide (and guard) within 1/8" of the work piece at all times. Do not force the material against the blade. Light pressure on the work piece will produce a smoother cut, and prevent excess friction, and heating of the blade.

KEEP THE SAW BLADE SHARP. Very little forward pressure is required for normal cutting. Keep the workpiece moving at a slow and consistent rate against the blade to ensure a smooth and accurate cut.

Avoid twisting the blade, by trying not to turn sharp corners. Remember, you must saw around corners.

CUTTING CURVES

When cutting curves, turn the stock carefully so that the blade follows without twisting. If a curve is so abrupt that it is necessary to repeatedly back up and cut a new kerf, a narrower blade, a blade with more set, or additional relief cuts Fig. 57, may be necessary to allow the blade to cut more efficiently. The more set a blade has, the easier it will allow the stock to be turned, but the cut is usually rougher.

When withdrawing the piece being cut, changing the cut, or for any other reason, be careful not to accidentally draw the blade off the wheels. In most cases, it is easier and safer to turn the stock and saw out through the waste material, rather than try to withdraw the stock from the blade.

Fig. 57

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Porter-Cable 28-248, 28-475X Operations, Adjusting Lower Blade Guides and Blade Support Bearing, Cutting Curves
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28-475X, 28-248 specifications

The Porter-Cable 28-248 and 28-475X are two impressive models from Porter-Cable, a brand known for its high-quality power tools that cater to the needs of both professionals and DIY enthusiasts. These models are designed to deliver reliable performance, durability, and innovative features suitable for a wide range of applications.

The Porter-Cable 28-248 is a 28-gauge pneumatic brad nailer. This tool is compact and lightweight, making it easy to maneuver in tight spaces. One of its standout features is the tool-free depth of drive adjustment, allowing users to modify the depth of the nails without additional tools. This is particularly useful when working with different materials or when precision is paramount.

The 28-248 is equipped with a rear exhaust that directs air away from the user, keeping the workspace clean and enhancing comfort during operation. The integrated power adjustment dial lets users adjust the power depending on the material being used, providing versatility across various projects. Additionally, the 28-248 features a reload indicator that signals when it's time to refill the magazine, preventing interruptions during work.

On the other hand, the Porter-Cable 28-475X is a more robust option designed for industrial applications. It is a 27-gauge nail gun that offers a higher capacity magazine for less downtime. The 28-475X features a stainless steel magazine that ensures durability and smooth operation while reducing the risk of jams.

This model also includes a selective actuation switch, allowing users to choose between sequential and contact firing modes based on their needs. The built-in dry fire lockout mechanism is another valuable feature that prevents the tool from firing without nails, which prolongs its lifespan and ensures safety.

The ergonomic design of both models emphasizes user comfort, with features like rubber grips that minimize fatigue during prolonged use. Both tools are compatible with a variety of nail sizes and types, making them suitable for a range of tasks from cabinetry to flooring installations.

In summary, the Porter-Cable 28-248 and 28-475X stand out for their innovative features, ergonomic designs, and flexibility in application. Whether you're a contractor or a DIY hobbyist, both models offer the durability and performance needed to tackle any job efficiently.
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