Bosch 3725DEVS Use and Care Manual download pdf (Page 8)

TO UNLOCK THE TRIGGER: squeeze trigger

and release it without depressing the "Lock-

ON" button.

If the “Lock-ON” button is

continuously being depressed,

the trigger can not be released.

VARIABLE SPEED WITH DIAL SETTING

Your sander is also equipped with a variable

speed dial. The sander's orbital pad speed can

be preset from zero to maximum nameplate

OPM by rotating the dial in the housing. The

dial may be set on or between any of six

positions (1=low through 6=high). The "Lock-

ON" button may also be used with any setting

of the dial.

The following table may be used as a general

guide for abrasive and backing pad selection,

but the best results will be obtained by sanding

a test sample of the workpiece first.

FRONT HANDLE

Your sander is equipped with a removable

front handle when sanding in tight quarters. To

remove handle, remove screw with allen

wrench. Always reinstall handle for normal

operation. Depending on the task, you may

grip the rear handle alone, the rear handle and

the front handle, or the rear handle and the top

f the ergonomically contoured soft grip motor

ousing, which is designed for that purpose.

Switch Backing Grit

Material setting pad size

rough/finish rough/finish

woods:

softwoods 4 / 6 extra soft 60 / 240

hardwoods 4 / 6 soft 60 / 180

veneers 4 soft 240 / 320

metals:

steel 4 soft 60 / 240

stainless 4 soft 120 / 240

aluminum 4/ 6 soft 80 / 240

rust spots 6 extra soft 60 / 120

paintwork:

sanding 2 / 3 soft 180 / 400

scratches 4 / 6 hard 120 / 240

stripping 4 soft 40/60 /80

SANDING: open-coat aluminum oxide sanding

discs are recommended for most wood or

metal sanding applications, as this synthetic

material cuts quickly and wears well. Some

applications, such as plastics, glass, or stone

require silicon carbide discs, which have a very

sharp cutting edge. For best results, use

Bosch sanding and polishing accessories

which are of superior quality and are carefully

selected to produce professional quality results

with your sander.

With the workpiece firmly secured, depress

switch while applying the pad to the work

surface. DO NOT apply excessive pressure

as this will slow the pad action, and DO NOT

start the tool and bring it up to speed before

applying to the work; swirl marks will result in

either case. In general, higher speeds and

moderate pressure will give the best results. If

faster removal is desired, DO NOT INCREASE

PRESSURE ON THE TOOL; use a coarser

grade of abrasive. Move the sander in long

sweeping strokes, parallel to the grain using

some lateral motion to overlap the strokes by

as much as 75%. The random orbit action

allows cross-grain sanding, but be careful not

to tilt the sander near edges, or undesirable

rounding may result.

If the surface is rough, begin with coarser grits

and then complete the surfacing with medium

and fine abrasives. Because the random orbit

action is so effective, it is often possible to

begin sanding with a medium grit disc and go

directly to fine finishing. To avoid uneven

results, do not skip more than one grit size

when going from coarser to finer, and do not

sand in one area for too long. When the job is

completed, release switch, and gently lift the

tool from the work surface at the same time.

POLISHING: for most polishing, the soft

backing pad will give the best results. The

random orbit sander may be fitted with a foam

buffing pad or polishing bonnet to polish or

remove scratches from painted or finished

-8-

Tool Tips

WARNING

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Bosch 3725DEVS Use and Care Manual Page 8

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