Bosch ROS20VSK, ROS10 Owner’s Manual

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IMPORTANT:	IMPORTANT :	IMPORTANTE:
Read Before Using	Lire avant usage	Leer antes de usar

Operating/Safety Instructions Consignes de fonctionnement/sécurité

Instrucciones de funcionamiento y seguridad

ROS10

ROS20VS

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	1-877-BOSCH99 (1-877-267-2499) www.boschtools.com
For English Version		Version française			Versión en español
	See page 2	Voir page 14			Ver la página 26

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	General Power Tool Safety Warnings
	Read all safety warnings and all instructions. Failure to follow the warnings
! WARNING
	and instructions may result in electric shock, fire and/or serious injury.

SAVE ALL WARNINGS AND INSTRUCTIONS FOR FUTURE REFERENCE

The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

Work area safety

Keep work area clean and well lit. Cluttered or dark areas invite accidents.

Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.

Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.

Avoid body contact with earthed or grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.

Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.

Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.

When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.

If operating a power tool in a damp location is unavoidable, use a Ground Fault Circuit Interrupter (GFCI) protected supply. Use of an GFCI reduces the risk of electric shock.

Personal safety

Stay alert, watch what you are doing and use common sense when operating a

power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.

Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.

Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and / or battery pack, picking up or carrying the tool.

Carrying power tools with your finger on the switch or energizing power tools that have the switch on invites accidents.

Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.

Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.

Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.

If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dustrelated hazards.

Power tool use and care

Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.

Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.

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Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.

Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.

Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use.

Many accidents are caused by poorly maintained power tools.

Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.

Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.

Service

Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Safety Rules for Random Orbital Sanders

Hold power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock.

Use clamps or another practical way to secure and support the workpiece to a stable platform. Holding the work by your hand or against the body leaves it unstable and may lead to loss of control.Unplug the sander before changing accessories.

Accidental start-ups may occur if sander is plugged in while changing an accessory.

If your tool is equipped with a dust bag, empty it frequently and after completion of sanding. Be extremely careful of dust disposal, materials in fine particle form may be explosive. Do not throw sanding dust on an open fire. Spontaneous combustion, may in time, result from mixture of oil or water with dust particles.

Always wear eye protection and a dust mask for dusty applications and when sanding overhead. Sanding particles can be

absorbed by your eyes and inhaled easily and may cause health complications.

Do not wet sand with this sander. Liquids entering the motor housing is an electrical shock hazard.

Do not use PSA pad on random orbit sanders whose speed exceeds 12,000/min. Exceeding the maximum operating speed of pad may cause pad to rupture or fly apart during use striking user or bystanders.

Do not use sandpaper intended for larger sanding pads. Larger sandpaper will extend beyond the sanding pad causing snagging, tearing of the paper or kick-back. Extra paper extending beyond the sanding pad can also cause serious lacerations.

Clamp or secure workpiece when sanding. Clamping the workpiece prevents it from being ejected from under the sander and leaves both hands to control the tool.

Keep the cord away from the spinning pad and sandpaper. The cord can become entangled with the pad.

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Additional Safety Warnings

GFCI and personal protection devices like electrician’s rubber gloves and footwear will further enhance your personal safety.

Do not use AC only rated tools with a DC power supply. While the tool may appear to work, the electrical components of the AC rated tool are likely to fail and create a hazard to the operator.

Keep handles dry, clean and free from oil and grease. Slippery hands cannot safely control the power tool.

Develop a periodic maintenance schedule for your tool. When cleaning a tool be careful not to disassemble any portion of the tool since internal wires may be misplaced or pinched or safety guard return springs may be improperly mounted.

Certain cleaning agents such as gasoline, carbon tetrachloride, ammonia, etc. may damage plastic parts.

Risk of injury to user. The power cord must only be serviced by a Bosch Factory Service Center or Authorized Bosch Service Station.

Some dust created by power sanding, sawing, grinding, drilling, and other construction activities

contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

•Lead from lead-based paints,

•Crystalline silica from bricks and cement and other masonry products, and

•Arsenic and chromium from chemicallytreated lumber.

Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

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Symbols

IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.

Symbol									Name		Designation/Explanation
				V					Volts		Voltage (potential)
				A					Amperes		Current
		Hz							Hertz		Frequency (cycles per second)
			W						Watt		Power
			kg						Kilograms		Weight
	min								Minutes		Time
				s					Seconds		Time
									Diameter		Size of drill bits, grinding wheels, etc.
			n0						No load speed		Rotational speed, at no load
				n					Rated speed		Maximum attainable speed
.../min									Revolutions or reciprocation		Revolutions, strokes, surface speed,
									per minute		orbits etc. per minute
0									Off position		Zero speed, zero torque...
1, 2, 3, ...									Selector settings		Speed, torque or position settings.
I, II, III,											Higher number means greater speed
0									Infinitely variable selector with off		Speed is increasing from 0 setting
									Arrow		Action in the direction of arrow
									Alternating current		Type or a characteristic of current
									Direct current		Type or a characteristic of current
									Alternating or direct current		Type or a characteristic of current
									Class II construction		Designates Double Insulated
											Construction tools.
									Earthing terminal		Grounding terminal
									Warning symbol		Alerts user to warning messages
									Li-ion RBRC seal		Designates Li-ion battery recycling
											program
									Ni-Cad RBRC seal		Designates Ni-Cad battery recycling
											program
									Read manual symbol		Alerts user to read manual
									Wear eye protection symbol		Alerts user to wear eye protection

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Symbols (continued)

IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.

This symbol designates that this tool is listed by Underwriters Laboratories.

This symbol designates that this component is recognized by Underwriters

Laboratories.

This symbol designates that this tool is listed by Underwriters Laboratories, to United States and Canadian Standards.

This symbol designates that this tool is listed by the Canadian Standards Association.

This symbol designates that this tool is listed by the Canadian Standards

Association, to United States and Canadian Standards.

This symbol designates that this tool is listed by the Intertek Testing

Services, to United States and Canadian Standards.

This symbol designates that this tool complies to NOM Mexican Standards.

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Functional Description and Specifications

Disconnect the plug from the power source before making any assembly, adjustments or changing accessories. Such preventive safety

measures reduce the risk of starting the tool accidentally.

Random Orbit Sander

			VARIABLE SPEED DIAL
FIG. 1
			(Model ROS20VS only)
	CORD

RUBBERIZED GRIP

ROCKER “ON/OFF” SWITCH

	MICROFILTER
	DUST CANISTER
RUBBERIZED	LID
GRIP	MICROFILTER
	DUST CANISTER
	VENTILATION OPENINGS
BACKING
PAD
	ABRASIVE DISC

MAXIMUM CAPACITIES

Pad diameter 5" (125 mm)

Abrasive diameter 5" (125 mm)

NOTE: For tool specifications refer to the nameplate on your tool.

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Assembly

BACKING PAD INSTALLATION

The random orbit sander is equipped with a backing pad of soft hardness, which is suitable for general service. Hard and extra-soft pads are available for other purposes, and in general are used as follows;

Extra soft pad - Polishing or sanding large or curved surfaces.

Soft pad - All purpose general sanding and polishing.

Hard pad - Heavy sanding on flat surfaces, especially with coarser abrasives.

To change backing pad, hold pad firmly and remove the four screws that secure the backing pad and remove old pad. Align new pad over bearing flange cover and locating pins on drive spindle, replace screws and securely tighten. Damaged or worn backing pads must be replaced immediately (Fig. 2).

FIG. 2	SCREW

BACKING

PAD

BEARING

FLANGE

COVER

LOCATING

PINS

INSTALLING ACCESSORIES

The random orbit sander uses hook-and-loop backed accessories, which firmly grip the pad when applied with moderate pressure. To change the accessory, merely peel off the old accessory, remove dust from the pad if necessary, and press the new accessory in place (Fig. 3). Be sure to align the sanding disc holes with the holes in the backing pad to allow the dust extraction system to function.

After considerable service the pad surface will become worn, and the pad must be replaced when it no longer offers a firm grip. If you are experiencing premature wearout of the pad hooks, it may be due to pressure being applied to the tool during operation.

FIG. 3

ABRASIVE

DISC

BACKING

PAD

PSA BACKING PAD ACCESSORIES

The optional RS036 soft PSA backing pad can be used with PSA backed accessories with pressure sensitive adhesive.

To change accessory, peel protective sheet from the back of accessory. Align accessory with backing pad and press firmly in place. To remove, lift an edge of accessory with your finger nail and peel it off the backing pad.

NOTE: Do not store tool with sanding disc on pad, as sanding creates heat which increases the adhesive bond. If the disc is left in place it may become very difficult to remove.

SANDING DISC ALIGNMENT POSTS

The optional carrying case is equipped with alignment posts that will allow you to easily align the holes in the sanding disc, with the holes in the backing pad. Place the sanding disc onto the alignment posts with the Velcro facing up (Fig. 4). Align holes on backing pad with alignment posts and firmly tool push downward.

FIG. 4

	ALIGNMENT	ABRASIVE
	POSTS
		DISC
		CARRYING CASE

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BACKING PAD DAMPER

Your tool is equipped with an integrated backing pad damper ring. This damper reduces the no-load speed, which helps prevent swirl marks on the workpiece surface and provides uniform finishing.

NOTE: If you notice steadily increasing noload speed, this indicates that the damper ring is worn and needs to be replaced.

To replace damper ring, remove backing pad as described in “Backing Pad Installation” and remove worn damper ring by pulling firmly out of locating groove. Loosen the two screws on shroud just enough so you can separate shroud approximately 1/4 inch. Align locating bumps on damper ring with cut outs in shroud and depress ring with thumbs until shroud seats into groove completely around ring, then tighten screws (Fig. 5).

Re-attach backing pad as described in “Backing Pad Installation”

IMPORTANT: Ring should not have bends or ripples when correctly seated.

FIG. 5

	BACKING
	PAD
DAMPER
RING
	BEARING
SHROUD	AFTER
	FLANGE
	COVER
	REMOVED
	LOCATING BUMPS
	ON UNDERSIDE OF
	DAMPER RING

Dust Collection

MICROFILTER DUST CANISTER

The integral dust extraction system collects sanding dust in canister supplied with your sander. For maximum efficiency, the dust canister should be emptied frequently during operation.

Your tool is equipped with a dust canister, empty it frequently, after completion of sanding and

before storing the sander. Be extremely careful of dust disposal, materials in fine particle form may be explosive. Do not throw sanding dust on an open fire. Combustion from

FIG. 6

1

	2	MICROFILTER
		DUST CANISTER

mixture of varnishes, lacquers, polyurethane, oil or water with dust particles can occur if there is a static discharge, spark introduced in the box, or excessive heat.

REMOVING AND INSTALLING

DUST CANISTER

To remove dust canister: Twist the canister left or right and simply pull away from the tool (Fig. 6).

To install dust canister: align dust port with hole in canister and push canister onto tool until it locks into place (Fig. 7).

FIG. 7

MICROFILTER

DUST CANISTER

DUST PORT

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CLEANING AND EMPTYING THE

DUST CANISTER

Before opening the dust canister lid, it is recommended to loosen dust from the microfilter dust canister by gently striking it against a solid surface (Fig. 8).

To empty canister, hold canister and maintain a firm grip. Firmly push upward on tab on corner of lid, and remove from canister (Fig. 9). Knock excess dust out of the microfilter, or remove dust with your fingers or a soft brush. You may notice that all the dust may not come out of the canister. This will not affect sanding performance but will reduce dust collection efficiency.

FIG. 8

NOTE: Do not wash the micro filter with soap and water. Dust may become more firmly lodged in the pores, which will reduce dust collection, and damage the micro filter.

ATTACHING VACUUM HOSE

When the canister is removed from the tool, an (optional) vacuum hose accessory can be attached to the dust port. To use this feature, attach vacuum hose (optional accessory) to dust port, then connect opposite end of the vacuum hose to a shop vacuum cleaner. A vacuum hose adapter is included for connection of this tool to a 1-1/4" or 1-1/2" vacuum hose (Fig. 10).

FIG. 9

MICROFILTER

DUST4 CANISTER LID

FIG. 10

VAC002
OR
VAC024	1-1/4”
	OR

1-1/2” HOSE

		BOSCH
	DUST	VACUUM
		HOSE
	PORT

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Operating Instructions

ROCKER “ON/OFF” SWITCH

TO TURN THE TOOL "ON" depress the upper portion of the dust-protected switch to the number “I” position.

TO TURN THE TOOL "OFF": depress the lower portion of the switch to the number “0” position (Fig. 1).

VARIABLE SPEED WITH DIAL SETTING (Model ROS20VS only)

Your sander is also equipped with a variable speed dial (Fig. 1). 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 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.

	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

FIG. 11

Your sander was designed to sand in small or confined areas. Its small size and light weight makes it ideal for overhead work.

You may grip the tool on top or around the motor housing as shown, which was contoured for that purpose (Fig. 11).

Tool Tips

SELECTING SANDING DISCS

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.

START OF SANDING

With the workpiece firmly secured, place the pad on the work surface, then switch the tool on. 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.

SANDING ACTION

In general, higher speeds will give the best results. If faster removal is desired, DO NOT APPLY PRESSURE ON THE TOOL; use a

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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.

SANDING SEQUENCE

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.

REMOVAL OF SANDER

To help prevent swirl marks when the job is completed, gently lift the tool from the work surface, then switch the tool off.

POLISHING

For most polishing, the soft backing pad will give the best results. The random orbit sander may be fitted with an optional foam buffing pad or polishing bonnet to polish or remove scratches from painted or finished surfaces, plastics, and even glass. The tool is operated in much the same way as when

sanding, but the following points should be observed;

Apply the compound to the surface, and use the sponge applicator pad with light pressure and a circular motion to remove scratches and restore weathered finishes. Use only as much compound as necessary, and clean the sponge frequently during use.

When initial polishing is completed, wipe away any excess compound with a soft towel, and then polish the surface to its final finish with the polishing bonnet. Use smooth overlapping strokes for best results.

It is important to note that the orbit speed of the random orbit sander is not the same as the RPM of a standard right-angle polisher. The random orbit action is much like a powerful hand polishing action, and therefore does not have the high speeds at the edge of the pad which can burn the work surface. For this reason, it is possible to select a higher OPM for the random orbit sander than the recommended RPM for a standard polisher. Practice on a hidden area or test surface until you have determined the tool is suitable for your polishing application.

Clean the buffing pad and polishing bonnet with mild detergents and warm water. DO NOT use solvents.

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