Porter-Cable MODEL 505 User Manual download pdf (Page 12)

STARTING TO WORK

This finishing sander has been designed for one or two hand operation, and

can easily be guided over the work surface. The normal weight of the

machine is sufficient for efficient sanding. Putting additional pressure on the

machine only slows down the speed of the pad, reduces the sanding

efficiency, and puts an additional burden on the motor. Also, additional

pressure might cause the sander to “jump”. Always start the machine

before placing it on the work surface. Once it has started, ease it down on

the work surface evenly and move it slowly back and forth in wide,

overlapping arcs. When you are through sanding, lift the sander off of the

work before stopping the motor.

WORKING PROCEDURE

The action of the Porter-Cable Finishing Sander causes thousands of tiny

abrasive grits to move in circular orbits against the work at high speed. Each

grain moves in the same direction at a constant speed so the cutting action

is uniform over the entire pad surface. Crossing and re-crossing of the

abrasive grits from all directions quickly levels surface irregularities to a fine,

uniform smoothness. Start the work with an abrasive grit just coarse enough

to remove the high spots and excessive roughness. Follow with a second

sanding using a grit one or two grades finer. Continue with successively

finer grits until the desired finish is obtained. DO NOT GO FROM A COARSE

GRlT TO A VERY FINE GRIT IN ONE STEP. Swirl marks will be impossible to

remove.

REQUIREMENTS FOR FINE FINISHING

In general, the coarser grits remove the most material in the shortest

time. The finer grits produce a smoother finish. By selecting the proper

type of abrasive, your workpiece can have a very smooth and even

finish.

REMOVING PAINT AND VARNISH

Read and follow instructions in “ADDITIONAL SAFETY

RULES FOR PAINT REMOVAL”.

Your sander will do a good job of removing old paint and varnish if you follow

these two instructions. First, use a coarse, open-coat abrasive to avoid the

usual clogging of the abrasive surfaces. Second, keep the machine moving

over new areas to avoid heating and softening the material being removed.

Try to work the entire surface at the same time by working in wide,

overlapping arcs. Do not concentrate on small areas. If liquid removers or

heaters are used to speed the work, be sure the surface is cool and dry and

the excess material has been scraped away before using the sander.

CABINETS AND DOORS

The orbital motion of the Porter-Cable Finishing Sander is ideally suited for

finishing doors, cabinet fronts, and other workpieces where wood grain is

perpendicular to that of a joining piece. Since the motion is circular, the

machine may be moved in any direction and crossed from one part to the

other without regard to direction of grain. A uniform and smooth finish will

result on both parts. The same procedure may be used to even joints in

cabinets The sander may be worked on both sides and in all directions to

obtain a smooth matching joint. By properly changing from coarser to finer

grit abrasives, you can achieve an excellent finish.

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Porter-Cable MODEL 505 User Manual Page 12

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