Bosch Power Tools 3725DEVS, 3727DEVS manual Tool Tips, Variable Speed with Dial Setting

TO UNLOCK THE TRIGGER: squeeze trigger and release it without depressing the "Lock- ON" button.

If the “Lock-ON” button is

!WARNING 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 of the ergonomically contoured soft grip motor housing, which is designed for that purpose.

Switch Backing Grit

Material setting pad size

rough/finishrough/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

Tool Tips

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

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