CS20 - Saw BOSCH - Free user manual and instructions

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BOSCH CS20 - Saw
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Product typeCircular saw
BrandBosch
ModelCS20
Blade diameter184 mm
Blade arbor5/8 in (16 mm)
Depth of cut at 90°62 mm
Depth of cut at 45°48 mm
Maximum bevel angle56°
Power supply120 V AC
Double insulationYes
Weight (approx.)4.5 kg
Main featuresStraight cuts, bevel cuts, pocket cuts, adjustable depth with detents (1/4, 1/2, 3/4, 2 in), Vari-Torque anti-kickback clutch, alignment guide, saw hook, rubberized handle, dust blower
MaintenanceCompressed air cleaning; gear lubrication; brush replacement; bearing replacement after 300-400 hours of use
SafetyLower blade guard automatic, guard lift lever, arbor lock button, double insulation
Spare parts / RepairabilityBlade (184 mm), mounting wrench, rip fence (optional). Repair by Bosch authorized service center
Included accessoriesBlade, wrench

Frequently Asked Questions - CS20 BOSCH

How to change the blade on the CS20 saw?
Unplug the saw. Press the lock button and turn the wrench until it engages. Turn the blade bolt counterclockwise with the wrench. Remove the outer washer and old blade. Install new blade aligning arrows. Replace outer washer and tighten bolt 1/8 turn with wrench. Do not overtighten to preserve the Vari-Torque clutch.
How to adjust the depth of cut?
Unplug the saw. Loosen the depth lever on the housing. Raise or lower the saw by the handle while holding the base. Use the depth detents for common wood thicknesses (1/4, 1/2, 3/4, 2 in). Tighten the lever. The blade should not extend more than one tooth length below the workpiece to avoid chipping.
How to adjust the bevel angle?
Unplug the saw. Loosen the bevel lever at the front of the saw. Tilt the base to the desired angle (0° to 56°) using the graduated scale. Tighten the lever. For 22.5° and 45° angles, detents facilitate adjustment. Verify the angle with a square if necessary.
How to use the rip fence?
The optional rip fence attaches by inserting into the slots in the base and locking with the locking screws at the desired width. For large sheets, use a straight board as a guide by clamping it to the workpiece. Slide the right side of the base against the board.
What to do in case of kickback?
Kickback is caused by a pinched or misaligned blade. Maintain a firm two-handed grip, position yourself to the side of the blade. If the blade binds, release the trigger and hold the saw motionless until it stops completely. Do not attempt to remove the saw while it is running. Use the Vari-Torque clutch to reduce risks.
How to clean and maintain the saw?
Always unplug the saw before cleaning. Use compressed air to blow sawdust from ventilation openings and covers. Clean the blade with kerosene to remove resin. Wear safety glasses. Brushes should be checked every 2 to 6 months and replaced with original Bosch parts.
Can the saw cut metal or masonry?
Yes, but with appropriate abrasive discs. For masonry, do not exceed 6 mm depth per pass and make multiple passes. Clean covers frequently. Wheels must have a maximum speed higher than that of the tool. Do not use liquid cooling.
How to make a pocket cut?
Set the depth of cut to the material thickness. Tilt the saw forward, raise the lower guard with the lever. Start the saw and gradually lower the back. Release the guard once the blade enters. Complete the cut normally. Wait for the blade to stop completely before removing the saw.
What is the warranty and where to repair?
Bosch limited warranty covers one year from purchase date for defects in materials or workmanship. For repairs, contact a Bosch authorized service center. Use only original replacement parts. The warranty does not cover accessories such as blades.
What accessories are included with the CS20 saw?
The saw comes with a 184 mm blade and a mounting wrench. The rip fence and case (model CS20K) are optional. See the manual for a complete list of recommended accessories.

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How do I reattach the adjustable depth lever that has come off?
Frequently Asked Questions - 07/02/2026
Response Notice-Facile

The adjustable depth lever of your BOSCH CS20 saw is designed to be easily removed and readjusted. Here’s how to reattach it:

Reattachment Procedure

  1. Unplug the saw before any intervention
  2. Align the lever with its attachment point on the housing
  3. Press firmly on the lever until it clicks into place
  4. Test the operation: pull the lever outward - it should move freely and lock when you push it back

Depth System

Your saw features a preset ratchet system that automatically stops the base at four standard depths:

  • 2 inches
  • 3/4 inch
  • 1/2 inch
  • 1/4 inch

To adjust the depth correctly: pull the lever outward, place it in the desired position, then push it back to lock it. Remember that the blade should not extend more than the length of a tooth from the back of the piece to minimize chipping.

If the lever does not click into place properly after reinsertion, the internal mechanism may be damaged and would require a replacement part. Please refer to the manual for BOSCH support contact information.

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Download the instructions for your Saw in PDF format for free! Find your manual CS20 - BOSCH and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. CS20 by BOSCH.

USER MANUAL CS20 BOSCH

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

Icon of a person reading a book inside a circle (no text or symbols).

Operating/Safety Instructions Consignes de fonctionnement/sécurité Instrucciones de funcionamiento y seguridad

CS20

Technical illustration of a Bosch electric saw cutting into a flat blade (no text or symbols).

Call Toll Free for Consumer Information & Service Locations

Power Tool Safety Rules

BOSCH CS20 - Power Tool Safety Rules - 1

WARNING

Read and understand all instructions. Failure to follow all instructions listed below may result in electric shock, fire and/or serious personal injury.

SAVE THESE INSTRUCTIONS

Work Area

Keep your work area clean and well lit. Cluttered benches and 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 by-standers, children, and visitors away while operating a power tool. Distractions can cause you to lose control.

Electrical Safety

Double Insulated tools are equipped with a polarized plug (one blade is wider than the other.) This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install a polarized outlet. Do not change the plug in any way. Double Insulation eliminates the need for the three wire grounded power cord and grounded power supply system. Before plugging in the tool, be certain the outlet voltage supplied is within the voltage marked on the nameplate. Do not use "AC only" rated tools with a DC power supply.

Avoid body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is grounded. If operating the power tool in damp locations is unavoidable, a Ground Fault Circuit Interrupter must be used to supply the power to your tool. Electrician's rubber gloves and footwear will further enhance your personal safety.

Don't 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 to carry the tools or pull the plug from an outlet. Keep cord away from heat, oil, sharp edges or moving parts. Replace damaged

cords immediately. Damaged cords increase the risk of electric shock.

When operating a power tool outside, use an outdoor extension cord marked "W-A" or "W." These cords are rated for outdoor use and reduce the risk of electric shock. Refer to "Recommended sizes of Extension Cords" in the Accessory section of this manual.

Personal Safety

Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.

Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, clothing, and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts. Keep handles dry, clean and free from oil and grease.

Avoid accidental starting. Be sure switch is "OFF" before plugging in. Carrying tools with your finger on the switch or plugging in tools that have the switch "ON" invites accidents.

Remove adjusting keys or wrenches before turning the tool "ON". A wrench or a key that is left attached to a rotating part of the tool may result in personal injury.

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

Use safety equipment. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.

Tool Use and Care

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.

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

Do not use the tool if the switch does not turn it ON or OFF. Any tool that cannot be controlled with the switch is dangerous and must be repaired.

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

Store idle tools out of reach of children and other untrained persons. Tools are dangerous in the hands of untrained users.

Maintain tools with care. Keep cutting tools sharp and clean. Properly maintained tools with sharp cutting edges are less likely to bind and are easier to control. Any alteration or modification is a misuse and may result in a dangerous condition.

Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the tool's operation.

If damaged, have the tool serviced before using. Many accidents are caused by poorly maintained tools. Develop a periodic maintenance schedule for your tool.

Use only accessories that are recommended by the manufacturer for your model. Accessories that may be suitable for one tool may become hazardous when used on another tool.

Service

Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury. For example: internal wires may be misplaced or pinched, safety guard return springs may be improperly mounted.

When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized parts or failure to follow Maintenance Instructions may create a risk of electric shock or injury. Certain cleaning agents such as gasoline, carbon tetrachloride, ammonia, etc. may damage plastic parts.

Safety Rules for Circular Saws

DANGER: Keep hands away from cutting area and blade. Keep your second hand on auxiliary handle or motor housing. If both hands are holding the saw, they cannot be cut by the blade. Hold the saw firmly to prevent loss of control. Figures in this manual illustrate typical hand support of the saw. NEVER place your hand behind the saw blade since kickback could cause the saw to jump backwards over your hand.

Keep your body positioned to either side of the saw blade, but not in line with the saw blade. KICKBACK could cause the saw to jump backwards. (See "Causes and Operator Prevention of Kickback.")

Do not reach underneath the work. The guard cannot protect you from the blade below the work. Do not attempt to remove cut material when the blade is moving.

Check the lower guard for proper closing before each use. Do not operate the saw if the lower guard does not move freely and close instantly. Never clamp or tie the lower guard into the open position. If the saw is accidentally dropped, the lower guard may be bent. Raise the lower guard only with the Lower Guard Lift Lever and make sure it moves freely and does not touch the blade or any other part, at all angles and depths of cut.

Check the operation of the lower guard spring. If the guard and the spring are not operating properly, they must be serviced before use. The lower guard may operate sluggishly due to damaged parts, gummy deposits, or a buildup of debris. Disconnect the plug from the power source. Periodically remove the blade, clean the upper and lower guards and the hub area with kerosene and wipe it dry, or blow it clean with compressed air.

The lower guard should be retracted manually only for special cuts such as "Pocket Cuts" and "Compound Cuts". Raise the lower guard by the Lower Guard Lift Lever. As soon as the blade enters the material, the lower guard must be released. For all other sawing, the lower guard should operate automatically.

Always observe that the lower guard is covering the blade before placing the saw down on a bench or floor. An unprotected, coasting blade will cause the saw to walk backwards, cutting whatever is in its path. Be aware of the time it takes for the blade to stop after the switch is released.

NEVER hold the piece being cut in your hands or across your leg. It is important to support the work properly to minimize body exposure, blade binding, or loss of control.

Hold the tool by the insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a "live" wire will also make exposed metal parts of the tool "live" and shock the operator.

When ripping, always use a rip fence or straight edge guide. This improves the accuracy of the cut and reduces the chance of blade binding.

Always use blades with the correct size and shape (diamond vs. round) arbor holes. Blades that do not match the mounting hardware of the saw will run eccentrically, causing loss of control and will not allow proper vari-torque engagement.

Never use damaged or incorrect blade washers or bolts. The blade washers and bolt were specially designed for your saw for optimum performance and safety of operation. The blade washers and the bolt on your saw have been designed to work as a "VARI-TORQUE CLUTCH". Understand the operation and settings of the VARI-TORQUE CLUTCH, because the proper setting of the CLUTCH, combined with firm handling of the saw, will allow you to control KICKBACK.

Do not run the saw while carrying it at your side. The lower guard may be opened by contact with your clothing. Accidental contact with the spinning saw blade could result in serious personal injury.

Depending upon use, the switch may not last the life of the saw. If the switch should fail in the "OFF" position, the saw may not start. If it should fail while the saw is running, the saw may not shut off. If either occurs, unplug the saw immediately and do not use until repaired.

This circular saw should not be mounted to a table and converted to a table saw. Circular saws are not designed or intended to be used as table saws.

CAUSES AND OPERATOR PREVENTION OF KICKBACK:

Kickback is a sudden reaction to a pinched, bound or misaligned saw blade, causing an uncontrolled saw to lift up and out of the workpiece toward the operator.

KICKBACK VARI-TORQUE CLUTCH

When the blade is pinched or bound tightly by the kerf closing down, the blade stalls and the motor reaction drives the unit rapidly back toward the operator.

If the blade becomes twisted or misaligned in the cut, the teeth at the back edge of the blade can dig into the top surface of the wood causing the blade to climb out of the kerf and jump back toward the operator.

Kickback is the result of tool misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below:

Maintain a firm grip with both hands on the saw and position your body and arm to allow you to resist KICKBACK forces.

KICKBACK forces can be controlled by the operator, if proper precautions are taken.

When blade is binding, or when interrupting a cut for any reason, release the trigger and hold the saw motionless in the material until the blade comes to a complete stop. Never attempt to remove the saw from the work or pull the saw backward while the blade is in motion or KICKBACK may occur. Investigate and take corrective action to eliminate the cause of blade binding. Wet lumber, green lumber or pressure treated lumber require special attention during cutting operation to prevent KICKBACK. Avoid cutting nails. Inspect for and remove all nails from lumber before cutting.

When restarting a saw in a workpiece, center the saw blade in the kerf and check that saw teeth are not engaged into the material. If saw blade is binding, it may walk up or KICKBACK from the workpiece as the saw is restarted.

Support large panels to minimize the risk of blade pinching and KICKBACK. Large panels tend to sag under their own weight. Supports must be placed under the panel on both sides, near the line of cut and near the edge of the panel. See "Cutting Large Sheets" in this manual.

Do not use dull or damaged blade. Unsharpened or improperly set blades produce narrow kerf causing excessive friction, blade binding and KICKBACK.

Blade depth and bevel adjusting locking knobs must be tight and secure before making cut. If blade adjustment shifts while cutting, it may cause binding and KICKBACK. Using the saw with an excessive depth of cut setting increases loading on the unit and susceptibility to twisting of the blade in the kerf. It also increases the surface area of the blade available for pinching under conditions of kerf close down.

Use extra caution when making a “Pocket Cut” into existing walls or other blind areas. The protruding blade may cut objects that can cause KICKBACK.

WARNING

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 chemically-treated 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.

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
DiameterSize of drill bits, grinding wheels, etc.
n0No load speedRotational speed, at no load
.../minRevolutions or reciprocation per minuteRevolutions, strokes, surface speed, orbits etc. per minute
0 Off position Zero speed, zero torque...
1, 2, 3, ...I, II, III,Selector settingsSpeed, torque or position settings.Higher number means greater speed
0▲Infinitely variable selector with offSpeed is increasing from 0 setting
ArrowAction in the direction of arrow
~Alternating currentType or a characteristic of current
==Direct currentType or a characteristic of current
~Alternating or direct currentType or a characteristic of current
Class II constructionDesignates Double Insulated Construction tools.
Earthing terminalGrounding terminal
⚠️Warning symbolAlerts user to warning messages
BOSCH CS20 - Symbols - 1Ni-Cad RBRC sealDesignates Ni-Cad battery recycling program

BOSCH CS20 - Symbols - 2

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

BOSCH CS20 - Symbols - 3

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

BOSCH CS20 - Symbols - 4

BOSCH CS20 - Symbols - 5

BOSCH CS20 - Symbols - 6

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

BOSCH CS20 - Symbols - 7

US

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

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

Functional Description and Specifications

WARNING

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.

Circular Saw

FIG. 1SAW HOOK: To use, simply lift up hook until it snaps into the open position. When not in use, always lower hook until it snaps into the closed position. TRIGGER SWITCH, RUBBERIZED GRIP, UPPER GUARD, LOWER GUARD LIFT LEVER, FOOT, LOWER GUARD QUADRANT, BOSCH, VENTILATION OPENINGS, AUXILIARY HANDLE, SA…

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

Assembly

ATTACHING THE BLADE

WARNING

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.

  1. Press the lock button and turn wrench until lock button engages. Saw shaft is now locked. Continue to depress button, turn wrench counter-clockwise and remove BLADE STUD and OUTER WASHER (Fig. 2).
  2. Retract the lower guard all the way up into the upper guard. While retracting the lower guard, check operation and condition of the LOWER GUARD SPRING.
  3. Make sure the saw teeth and arrow on the blade point in the same direction as the arrow on the lower guard.
  4. Slide blade through slot in the foot and mount it against the INNER WASHER on the shaft. Be sure the large diameter of the INNER and OUTER washers lay flush against the blade.
  5. Reinstall OUTER WASHER. First tighten BLADE STUD finger tight, then TIGHTEN BLADE STUD 1/8 TURN (45°) WITH THE WRENCH PROVIDED.

Do not use wrenches with longer handles, since it may lead to over tightening of the blade stud.

VARI-TORQUE CLUTCH

This clutching action is provided by the friction of the OUTER WASHER against the BLADE and permits the blade shaft to turn when the blade encounters excessive resistance. When the BLADE STUD is properly tightened (as described in No. 5 of Attaching The Blade), the blade will slip when it encounters excessive resistance, thus reducing saw's tendency to KICKBACK.

One setting may not be sufficient for cutting all materials. If excessive blade slippage occurs, tighten the blade stud a fraction of a turn more (less than 1/8 turn). OVERTIGHTENING THE BLADE STUD NULLIFIES THE EFFECTIVENESS OF THE CLUTCH.

UPPER GUARD, LOWER GUARD SPRING, BOSCH, AUXILIARY HANDLE, LOWER GUARD LIFT LEVER, BLADE, OUTER WASHER (Large Diameter Faces Blade), BLADE STUD (Tighten/Loosen), INNER WASHER (Large Diameter Faces Blade), LOWER GUARD, LOCK BUTTON, FIG. 2.

Installing Power Cord

WARNING

DIRECT CORD CONNECT SYSTEM HAS BEEN

CONFIGURED TO BE USED WITH 12AWG SJ CORD, MAXIMUM LENGTH OF 50 FEET. INSPECT THE CORD, DO NOT USE IF DAMAGED.

  1. Loop cord as shown in figure A.
  2. Insert looped end of cord through slot in handle and loop cord into channel provided in handle as shown figure. B).

ATTENTION: before inserting plug into handle, always make sure you leave enough cord at plug end to avoid tension on plug when inserted into tool.

  1. Push end of plug through spring clip and into female outlet in handle as shown below. To remove plug from tool, simply remove from outlet and pull away from spring clip.

NOTE: If the spring clip does not securely hold the plug it may be necessary to lightly squeeze the clip together with a pliers.

FIG. ALine drawing of a cable connector with a plug inserted, showing no text or symbols.

SPRING CLIP, FIG. B

SPRING CLIP

Operating Instructions

DEPTH ADJUSTMENT

Your saw is equipped with a depth detent system that will stop the foot at 2x, 3/4", 1/2", and 1/4" standard lumber depths.

Disconnect plug from power source. Loosen the depth adjustment lever located in the housing of saw. Hold the foot down with one hand and raise or lower saw by the handle.

FIG. 3, CALIBRATED DEPTH BRACKET, ADJUSTABLE DEPTH LEVER, 1, 2, FOOT

Tighten lever at the depth setting desired. Check desired depth (Fig. 3).

Your saw also features a adjustable depth adjustment lever for consistent locking. To adjust, simply pull outward on lever and reposition to desired position (Fig. 3).

Not more than one tooth length of the blade should extend below the material to be cut, for minimum splintering (Fig. 4).

FIG. 4, BOSCH, ONE TOOTH LENGTH SHOULD PENETRATE WOOD FOR MINIMUM SPLINTERING

90° CUTTING ANGLE CHECK

Disconnect plug from power source. Set foot to maximum depth of cut setting. Loosen bevel adjustment lever, set to 0° on quadrant, retighten lever and check for 90° angle between the blade and bottom plane of foot with a square (Fig. 5). Make adjustments by turning the small alignment screw from bottom side of foot, if necessary.

FIG. 5, BEVEL ADJUSTMENT LEVER, FOOT, BLADE, 90° ALIGNMENT SCREW

BEVEL ADJUSTMENT

Your saw is equipped with a bevel detent system that will stop the foot at 22.5°, and 45° angles.

Disconnect plug from power source. The foot can be adjusted up to 56° by loosening the bevel adjustment lever at the front of the saw. Align to desired angle on calibrated quadrant. Then tighten bevel adjustment lever (Fig. 6).

Your saw also features an adjustable bevel adjustment lever for consistent locking. To adjust, simply pull outward on lever and reposition to desired position (Fig. 1).

Because of the increased amount of blade engagement in the work and decreased

stability of the foot, blade binding may occur. Keep the saw steady and the foot firmly on the workpiece.

FIG. 6, QUADRANT, BEVEL ADJUSTMENT LEVER

LINE GUIDE

For a straight 90° cut, use right side of notch in the foot. For 45°-56° bevel cuts, use the left side (Fig. 7). The cutting guide notch will give an approximate line of cut. Make sample cuts in scrap lumber to verify actual line of cut. This will be helpful because of the number of different blade types and thicknesses available. To ensure minimum splintering on the good side of the material to be cut, face the good side down.

FIG. 745° BEVEL CUTS, 90° VERTICAL CUTS

SWITCH

WARNING

When starting the tool, hold it with both hands.

The torque from the motor can cause the tool to twist.

To turn tool "ON", squeeze the trigger switch. To turn the tool "OFF", release the trigger switch, which is spring loaded and will return to the off position automatically.

Your saw should be running at full speed BEFORE starting the cut, and turned off only AFTER completing the cut. To increase switch life, do not turn switch on and off while cutting.

GENERAL CUTS

Always hold the saw handle with one hand and the auxiliary handle or housing with the other.

WARNING

Always be sure either hand does not interfere with the risk of the lower guard.

Maintain a firm grip and operate the switch with a decisive action. Never force the saw. Use light and continuous pressure.

WARNING

After completing a cut and the trigger has been

released, be aware of the necessary time it takes for the blade to come to a complete stop during coast down. Do not allow the saw to brush against your leg or side, since the lower guard is retractable, it could catch on your clothing and expose the blade. Be aware of the necessary blade exposures that exist in both the upper and lower guard areas.

When cutting is interrupted, to resume cutting: squeeze the trigger and allow the blade to reach full speed, re-enter the cut slowly and resume cutting.

When cutting across the grain, the fibers of the wood have a tendency to tear and lift. Advancing the saw slowly minimizes this effect. For a finished cut, a cross cut blade or miter blade is recommended.

CUTTING MASONRY/METAL

This tool is not recommended for continuous and general usage with metal or masonry cut-off wheels. If you use your saw for cutting these materials, use the appropriate wheel for the material being cut.

When cutting masonry, do not cut a depth of more than 1/4 inch (6 mm). Make successive passes to achieve desired depth. Apply a light forward pressure. Do not overload motor. Disconnect plug from power source and clean dust from air vents frequently. Metal cutting is done at full depth.

WARNING

Clean guards frequently to assure a rapid return of

lower guard. The lower guard may become sluggish when cutting masonry materials.

WARNING

Abrasive cut-off wheels must have a maximum safe operating speed greater than the “no load RPM” marked on the tool’s nameplate.

Wheels running over the rated speed can fly apart and cause injury.

WARNING

Do not use the abrasive cut-off wheel near flammable materials.

Sparks from the wheel could ignite these materials.

WARNING

This machine is not intended to be used with wet diamond wheels.

Using water or other liquid coolants with this machine may result in electrocution or shock. Use of dry diamond wheels is acceptable.

POCKET CUTS

Disconnect the plug from the power source before making adjustments. Set depth adjustment according to material to be cut. Tilt saw forward with cutting guide notch lined up with the line you've drawn. Raise the lower guard, using lift lever and hold the saw by the front and rear handles (Fig. 8).

With the blade just clearing the material to be cut, start the motor. Gradually lower the back end of saw using the front end of the foot as the hinge point.

WARNING: As blade starts cutting the material, release the lower guard immediately. When the foot rests flat on the surface being cut, proceed cutting in forward direction to end of cut.

WARNING: Allow blade to come to a complete stop before lifting the saw from cut. Also, never pull the saw backward since blade will climb out of the material and KICKBACK will occur.

Turn saw around and finish the cut in the normal manner, sawing forward. If corners of your pocket cut are not completely cut through, use a jigsaw or hand saw to finish the corners.

FIG. 8, FOOT, BOSCH, LOWER GUARD LIFT LEVER, LINE GUIDE

CUTTING LARGE SHEETS

Large sheets and long boards sag or bend, depending on support. If you attempt to cut without leveling and properly supporting the piece, the blade will tend to bind, causing KICK-BACK and extra load on the motor (Fig. 9).

Support the panel or board close to the cut, as shown in (Fig. 10). Be sure to set the depth of the cut so that you cut through the sheet or

board only and not the table or work bench. The two-by-fours used to raise and support the work should be positioned so that the broadest sides support the work and rest on the table or bench. Do not support the work with the narrow sides as this is an unsteady arrangement. If the sheet or board to be cut is too large for a table or work bench, use the supporting two-by-fours on the floor and secure.

FIG. 9 WRONG FIG. 10 RIGHT

RIP CUTS

The combination blade provided with your saw is for both cross cuts and rip cuts. Ripping is cutting lengthwise with the grain of the wood. Rip cuts are easy to do with a rip fence (Fig. 11). Rip Fence is available as an accessory (not included). To attach fence, insert fence through slots in foot to desired width as shown and secure with the thumb screw (not included).

RIP BOARD GUIDE

When rip cutting large sheets, the rip fence may not allow the desired width of cut.

Clamp or nail a straight piece of 1" (25 mm) lumber to the sheet as a guide (Fig. 12).

Use the right side of the foot against the board guide.

FIG. 11 THUMB SCREW FOOT RIP FENCE DESIRED WIDTH OF CUT

FIG. 12 RIP BOARD GUIDE DESIRED LINE OF CUT

Maintenance

Service

WARNING

Preventive maintenance performed by unauthorized

personnel may result in misplacing of internal wires and components which could cause serious hazard. We recommend that all tool service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station.

TOOL LUBRICATION

Your Bosch tool has been properly lubricated and is ready to use. It is recommended that tools with gears be regreased with a special gear lubricant at every brush change.

CARBON BRUSHES

The brushes and commutator in your tool have been engineered for many hours of dependable service. To maintain peak efficiency of the motor, we recommend every two to six months the brushes be examined. Only genuine Bosch replacement brushes specially designed for your tool should be used.

BEARINGS

After about 300-400 hours of operation, or at every second brush change, the bearings should be replaced at Bosch Factory Service Center or Authorized Bosch Service Station. Bearings which become noisy (due to heavy load or very abrasive material cutting) should be replaced at once to avoid overheating or motor failure.

Cleaning

WARNING

To avoid accidents always disconnect the tool from

the power supply before cleaning or performing any maintenance. The tool may be cleaned most effectively with compressed dry air. Always wear safety goggles when cleaning tools with compressed air.

Ventilation openings and switch levers must be kept clean and free of foreign matter. Do not attempt to clean by inserting pointed objects through openings.

BOSCH CS20 - WARNING - 1

CAUTION

Certain cleaning agents and solvents damage

plastic parts. Some of these are: gasoline, carbon tetrachloride, chlorinated cleaning solvents, ammonia and household detergents that contain ammonia.

CARE OF BLADES

Blades become dull even from cutting regular lumber. If you find yourself forcing the saw forward to cut instead of just guiding it through

the cut, chances are the blade is dull or coated with wood pitch.

When cleaning gum and wood pitch from the blade, unplug the saw and remove the blade. Remember, blades are designed to cut, so handle carefully. Wipe the blade with kerosene or similar solvent to remove the gum and pitch. Unless you are experienced in sharpening blades, we recommend you do not try.

Accessories

BOSCH CS20 - Accessories - 1

WARNING

If an extension cord is necessary, a cord with adequate size conductors that is capable of carrying the current necessary for your tool must be used. This will prevent excessive voltage drop, loss of power or overheating. Grounded tools must use 3-wire extension cords that have 3-prong plugs and receptacles.

NOTE: The smaller the gauge number, the heavier the cord.

RECOMMENDED SIZES OF EXTENSION CORDS 120 VOLT ALTERNATING CURRENT TOOLS

Tool's Ampere RatingCord Size in A.W.G.Wire Sizes in mm2
Cord Length in Feet Cord Length in Meters 25 50 100 150 15 30 60 120
3-618 16 16 14 0.75 0.75 1.5 2.5
6-818 16 14 12 0.75 1.0 2.5 4.0
8-1018 16 14 12 0.75 1.0 2.5 4.0
10-1216 16 14 12 1.0 2.5 4.0 —
12-1614 12 — — — — — — — —

* Blade * Wrench ** Rip Fence * Carrying case (Model CS20K only)

(*= standard equipment)

(**= optional accessories)

SPRING CLAMP FIG. B

SPRING CLAMP

SPRING CLIP

Robert Bosch Tool Corporation ("Seller") warrants to the original purchaser only, that all BOSCH portable and benchtop power tools will be free from defects in material or workmanship for a period of one year from date of purchase. SELLER'S SOLE OBLIGATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty and, to the extent permitted by law, any warranty or condition implied by law, shall be the repair or replacement of parts, without charge, which are defective in material or workmanship and which have not been misused, carelessly handled, or misrepaired by persons other than Seller or Authorized Service Station. To make a claim under this Limited Warranty, you must return the complete portable or benchtop power tool product, transportation prepaid, to any BOSCH Factory Service Center or Authorized Service Station. For Authorized BOSCH Power Tool Service Stations, please refer to your phone directory.

THIS LIMITED WARRANTY DOES NOT APPLY TO ACCESSORY ITEMS SUCH AS CIRCULAR SAW BLADES, DRILL BITS, ROUTER BITS, JIGSAW BLADES, SANDING BELTS, GRINDING WHEELS AND OTHER RELATED ITEMS.

ANY IMPLIED WARRANTIES SHALL BE LIMITED IN DURATION TO ONE YEAR FROM DATE OF PURCHASE. SOME STATES IN THE U.S., SOME CANADIAN PROVINCES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING FROM THE SALE OR USE OF THIS PRODUCT. SOME STATES IN THE U.S. AND SOME CANADIAN PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.

THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE IN THE U.S., PROVINCE TO PROVINCE IN CANADA AND FROM COUNTRY TO COUNTRY.

THIS LIMITED WARRANTY APPLIES ONLY TO PORTABLE AND BENCHTOP ELECTRIC TOOLS SOLD WITHIN THE UNITED STATES OF AMERICA, CANADA AND THE COMMONWEALTH OF PUERTO RICO. FOR WARRANTY COVERAGE WITHIN OTHER COUNTRIES, CONTACT YOUR LOCAL BOSCH DEALER OR IMPORTER.

BOSCH PORTABLE AND BENCHTOP POWER TOOLS LIMITED WARRANTY

© Robert Bosch Tool Corporation 1800 W. Central Road Mt. Prospect, IL 60056 -2230

Exportado por: Robert Bosch Tool Corporation Mt. Prospect, IL 60056 -2230, E.U.A.

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Product information

Brand : BOSCH

Model : CS20

Category : Saw