Bosch GSS20-40 Owner’s Manual

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IMPORTANT:	IMPORTANT :	IMPORTANTE:
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Operating/Safety Instructions
Consignes de sécurité/d’utilisation
Instrucciones de funcionamiento y seguridad
GSS20-40
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	appelez ce numéro gratuit
1-877-BOSCH99 (1-877-267-2499) www.boschtools.com
For English Version	Version française	Versión en español
See page 2	Voir page 13	Ver la página 24
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Safety Symbols

The definitions below describe the level of severity for each signal word. Please read the manual and pay attention to these symbols.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a hazardous situation which, if not avoided, will result in death or serious injury.

CAUTION, used with the safety alert symbol, indicates a hazardous situation which, if not avoided, will result in minor or moderate injury.

General Power Tool Safety Warnings

Read all safety warnings and all instructions. Failure to follow the warnings 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

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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.

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.

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Safety Rules for Orbital Sanders

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

Use clamps or other practical way to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.

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 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.

Always wear eye and respiratory protection for dusty applications and when sanding overhead. Sanding particles can be ab-

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

Use special precautions when sanding chemically pressure treated lumber, paint that may be lead based, or any other materials that may contain carcinogens. A suitable breathing respirator and protective clothing must be worn by all persons entering the work area. Work area should be sealed by plastic sheeting and persons not protected should be kept out until work area is thoroughly cleaned.

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

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.

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.

Ensure the switch is in the off position before inserting battery pack. Inserting the battery pack into power tools that have the switch on invites accidents.

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 per min-	Revolutions, strokes, surface speed, or-
				ute	bits etc. per minute

0				Off position	Zero speed, zero torque...

1, 2, 3, ...				Selector settings	Speed, torque or position settings. Higher
I, II, III,					number means greater speed
I, II, III,

				Infinitely variable selector with off	Speed is increasing from 0 setting

				Arrow	Action in the direction of arrow
				Arrow	Action in the direction of arrow

				Alternating current	Type or a characteristic of current

				Direct 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
				Alternating or direct current	Type or a characteristic of current

				Class II construction	Designates Double Insulated Construc-
					tion tools.

				Earthing terminal	Grounding terminal
				Earthing terminal	Grounding terminal

				Li-ion RBRC seal	Designates Li-ion battery recycling pro-
					gram

				Ni-Cad RBRC seal	Designates Ni-Cad battery recycling pro-
					gram

				Read manual symbol	Alerts user to read manual

				Wear eye protection symbol	Alerts user to wear eye protection

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Symbols (continued)

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 mea-

sures reduce the risk of starting the tool accidentally.

Orbital Sander

Fig. 1

1	3

6A				5B
				5B
		5A	4
	6B	5A
	7
1	Dust-sealed switch		6A Front clamp lever
2	Dust canister		6B Front clamping bracket
3	Microfilter		7	Sanding sheet
4	Sanding pad		8	Soft-grip area
5A Rear clamp lever			9	Ventilation openings
5B Rear clamping bracket
	Model number		GSS20-40
Pad Size:			4 1/2” x 4 1/8” (1/4 sheet)
Regular Sanding Sheet:			4 1/2” x 5 1/2”
PSA (Stick-On) Sanding Sheet:			4 1/2” x 4 1/2”

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

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Assembly

Always disconnect the plug from the power source before attaching or removing sand-

ing sheets.

ATTACHING SANDING SHEETS

When attaching a new sanding sheet, remove any dust or debris from the sanding pad 4 (e. g. with a brush).

1.Unlock both sanding-sheet clamp levers 5A and 6A and swivel them downwards (Fig. 2).

Fig. 2

6A 5B

2.Insert the sanding sheet 7 under the rear clamping bracket 5B. Ensure that the sanding sheet 7 is not too short to be correctly clamped under clamping brackets 5A and 5B. Swivel the sanding sheet clamp lever 5A back into the starting position and lock it there (Fig. 3).

Fig. 3

3.Place the sanding sheet taut around the sanding pad 4. Clamp the front part of the sanding sheet under the front clamping bracket 6B. Ensure that the sanding sheet 7 is not too short and that it is correctly

clamped. Swivel the sanding-sheet clamping lever 6A back into the starting position and lock it there (Fig. 4).

Fig. 4

4 6A 7

PUNCH PLATE

After the sanding sheet has been installed, it will be necessary to punch holes into the sheet using the punch plate provided with your sander. Align sander base with punch plate and push down on sander until punch plate pierces the sheet. Then remove punch plate from sander (Fig. 5)

Fig. 5

To ensure optimum dust extraction, pay attention that the punched holes in the sanding sheet match with the holes in the sanding plate.

REMOVING SANDING SHEETS

To remove the sanding sheet 7, unlock both sanding-sheet clamp levers 5A and 6A and pull the sanding sheet out of its holder.

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ATTACHING PSA “STICK-ON”

SANDING SHEETS

Your sander can also be used with PSAbacked “stick-on” sanding sheets (sandpaper), which have pressure sensitive adhesive.

1.Peel protective sheet from the back of PSA sheet.

2.Align PSA sheet with backing pad and press firmly in place.

Notes:

•Make sure that clamp levers are latched, even when PSA sanding sheets are used.

•Remove PSA sheets soon after completing each sanding operation in order to prevent the adhesive from creating a hardened bond with the backing pad.

REMOVING PSA SANDING SHEETS

To remove, lift an edge of sheet with your fingernail and peel it off the backing pad.

Note: If PSA sheet is accidentally left on the pad and has cooled down, the best way to remove it is to sand for three to five minutes to soften the adhesive backing.

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 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. Do not mix collected dust with paint or varnish, or use it to absorb or dry liquid chemicals.

REMOVING AND INSTALLING

DUST CANISTER

To remove dust canister: rotate dust canister 2 while pulling it away from the tool (Fig. 6).

Fig. 6

To install dust canister: align dust port 14 with hole in canister 2 and push canister onto tool until it locks into place (Fig. 7).

Fig. 7

CLEANING AND EMPTYING

THE DUST CANISTER

The dust canister is transparent which will allow you to easily see when empting and cleaning is required.

To empty the dust canister: screw off and remove microfilter 3 from the dust canister 2 (Fig. 8).

Empty dust canister 2. It is recommended to loosen dust from the microfilter 3 by gently striking it against a solid surface (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.

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Fig. 8	ATTACHING VACUUM HOSE
	Dust collection can also be achieved by at-
	taching the tool to a vacuum cleaner.
	The tool’s dust port is sized to accept Bosch
	vacuum cleaner hoses (sold separately) that
	have rubber nozzles.
	1. Attach the vacuum cleaner hose’s nozzle 16
	to dust port 14 (Fig. 10).

2. Attach the opposite end of the hose to the vacuum cleaner.

3	Fig. 10

Fig. 9

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

To ensure optimum dust extraction, empty and clean the canister and microfilter frequently.

To attach a 1-1/4” or 1-1/2” hose to the tool, the Bosch VAC024 vacuum hose adapter (sold separately) is required.

When vacuuming dry dust that is especially detrimental to health or may be carcinogenic, use a vacuum cleaner that is specifically designed for that purpose.

When sanding on vertical surfaces, hold the power tool in such a manner that the vacuum hose faces downward.

Operating Instructions

ROCKER “ON/OFF” SWITCH

To turn the tool ON or OFF: Push IN the switch rocker to the left or right side of the tool. Always hold the sander off the work when turning the switch ON or OFF.

SANDING SHEETS (SANDPAPER)

Aluminum oxide, silicon carbide, or other synthetic abrasives are recommended for power sanding use. Natural abrasives, such as flint

or garnet sheet are too soft for economical use in power sanding. For best results, use Bosch sanding sheets: The uniform spacing between grains minimizes filling or loading. The high quality aluminum oxide sheet with heavy backing cuts faster and lasts longer.

The following are recommended sanding sheets and applications:

• Coarse Grit: For rough wood sanding.

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•Medium Grit: For general wood sanding.

•Fine Grit: For smoothing wood or plaster patches.

•Extra Fine Grit: For final sanding bare wood and smoothing old paint.

There are also different types of sanding sheets made for wood, paint and other surfaces.

Sanding sheets can be purchased pre-sized or can be conveniently cut from large-size commercially available sheets (standard size: 9” x 11-1/16” or 228 x 280 mm). Cut into four pieces of equal size as shown (Fig. 11). Choose the proper grit for the job.

Fig. 11


HERE		(228mm)9"
CUT HERE
CUT
CUT

11-1/16" (280mm)

SANDING TIPS

Bosch orbital sanders are designed to produce exceptional finishes on wood surfaces, speed stock removal, or to remove lacquer, varnish, and other coated finishes.

Orbital sanding provides fast, smooth final finishes. And this model can sand flush on all three sides of the tool to get in tight places typical of cabinets, desks and shelving.

•Starting and stopping of sanding - Contact the work with the tool after sander has reached its full speed and remove it from the work before turning the switch “OFF”.

Operating in this manner will prolong switch and motor life and will greatly increase the quality of your work.

•This sander’s even weight distribution and the prevention of sanding sheet slippage by the clamping system virtually eliminate any benefit from pressing on the sander. Excessive pressure to the sander may result in an uneven sanding job and premature grit wear. Constant and excessive pressure can cause overheating and possible damage to the motor, as well as premature wear out of the pad.

•It’s usually best to work in strokes that parallel the grain, using some lateral motion so the main strokes are overlapped as much as 75%.

•If the surface is rough, start sanding with a coarse grit, then medium, and then finish with a fine or extra-fine grit. This procedure will vary with different types of materials and work.

•Continue to sand with each grit until the surface looks uniform.

•When going from one grit size to a finer size, do not skip more than two grit sizes.

•To remove the greatest amount of stock, use a coarse grit and move the sander steadily over the entire surface against the grain as well as with the grain. DO NOT REMAIN IN ONE SPOT TOO LONG. It may remove too much material and uneven sanding will result.

•Sanding with the grain of the wood gives the smoothest final finish.

STORING THE SANDER

Do not store tool with PSA sanding sheets on pad, as sanding creates heat, which will cause an adhesive bond between the sheet and the pad to harden when sheet and pad cool down. (See REMOVING PSA SANDING SHEETS on page 9.)

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