Porter-Cable 504 Functional Description, Assembly, Foreword, Selecting AN Abrasive Belt

FUNCTIONAL DESCRIPTION

FOREWORD

Porter-Cable Belt Sanders are designed for smoothing rough boards, removing old paint and varnish, fine-surfacing wood, metal, plastics, and other materials.

ASSEMBLY

NOTE: This tool is shipped assembled. No assembly time or tools are required.

NOTE: The knob (A) Fig. 1 was re- moved from the front of the unit for shipping purposes. Screw the knob (A) into the threaded hole (B) securely.

B

A

Fig. 1

SELECTING AN ABRASIVE BELT

The principal abrasive material used on belts for machine sanding are aluminum oxide and silicon carbide. Aluminum oxide is not as hard as the silicon carbide, but is tougher and more suited for woods and soft (nonferrous) metals. Silicon carbide is extremely hard and is best suited for surfacing stone, marble and glass.

Abrasives are classed as open-coated (grit spaced) or closed-coated (Grit non- spaced). Closed coatings provide hard, fast cutting action for hardwoods and dense metals while the open coatings are more suited to soft materials and painted surfaces.

To obtain the best finish, start with a “COARSE” grade of abrasive and change to “MEDIUM” and “FINE” grades as work progresses.

A wide range of available PORTER-CABLE Sanding Belts is listed in the back of the manual. Keep a full assortment on hand so that the correct belt will always be available.

INSTALLING AND REMOVING THE ABRASIVE BELT

Disconnect tool from power source.

1. Lay the sander on its left side and
move the tension relief lever (A)
Fig. 2 to the right. Lock it under
	B
the catch on the plate.

2.	Remove the old belt.
3.	Install the new belt so that the
	arrow (B), printed on the inside of
	the belt, is at the top and pointing
		A
	toward the front of the sander.
NOTE: Some sanding belts are bi-			Fig. 2
directional. These bi-directional belts

will not have arrows printed on them. They may be installed to run in either direction.

4.Position the belt so that the outer edge is flush with the outer ends of the pulleys.

5.Release the tension lever to restore belt tension.

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