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Your miter saw has been engineered and manufactured to our high standard for dependability, ease of operation, and
operator safety. When properly cared for, it will give you years of rugged, trouble-free performance.
WARNING:
To reduce the risk of injury, the user must read and understand the operator's manual before using this product.
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SAVE ThIS MANUAL FOR FUTURE REFERENCE
OPERATOR'S MANUAL
12 in. COMPOUND MITER SAW
WITh LASER
R4120
product.
®
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Double Insulated
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Table of Contents
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Summary of Contents for RIDGID R4120
- Page 1 When properly cared for, it will give you years of rugged, trouble-free performance. WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using this product. Thank you for buying a RIDGID product. ®...
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Page 2: Table Of Contents
TABLE OF CONTENTS Introduction ..................................2 General Safety Rules ..............................3-4 Specific Safety Rules ..............................4-5 Symbols ..................................6-7 Electrical ................................... 8 Glossary of Terms ................................9 Features ..................................10-12 Tools Needed ................................. 13 Loose Parts ..................................13 ... -
Page 3: General Safety Rules
GENERAL SAFETY RULES SECURE WORK. Use clamps or a vise to hold work when practical, it is safer than using your hand and WARNING: frees both hands to operate the tool. Read and understand all instructions. Failure to DO NOT OVERREACh. Keep proper footing and follow all instructions listed below, may result in balance at all times. -
Page 4: Specific Safety Rules
GENERAL SAFETY RULES NEVER USE IN AN ExPLOSIVE ATMOSPhERE. DO NOT USE TOOL IF SWITCh DOES NOT TURN IT Normal sparking of the motor could ignite fumes. ON AND OFF. Have defective switches replaced by an authorized service center. ... - Page 5 SPECIFIC SAFETY RULES NEVER hand hold a workpiece that is too small to be MAKE SURE ThE WORK AREA hAS AMPLE LIGhTING clamped. Keep hands clear of the cutting area. to see the work and that no obstructions will interfere with safe operation BEFORE performing any work using your ...
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Page 6: Symbols
SYMBOLS Some of the following symbols may be used on this 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 Volts Voltage Amperes Current Hertz Frequency (cycles per second) -
Page 7: Symbols
AUThORIZED SERVICE CENTER for repair. When servic- understand completely the operator’s manual. Save ing, use only identical replacement parts. this operator’s manual and review frequently for continuing safe operation and instructing others who may use this product. Call RIDGID customer ® service for assistance. WARNING: The operation of any power tool can result in foreign objects being thrown into your eyes, which can result in severe eye damage. -
Page 8: Electrical
ELECTRICAL DOUBLE INSULATION ExTENSION CORDS Double insulation is a concept in safety in electric power When using a power tool at a considerable distance from tools, which eliminates the need for the usual three-wire a power source, be sure to use an extension cord that has grounded power cord. -
Page 9: Glossary Of Terms
GLOSSARY OF TERMS Anti-Kickback Pawls (radial arm and table saws) Non-Through Cuts A devise which, when properly installed and maintained, Any cutting operation where the blade does not extend is designed to stop the workpiece from being kicked back completely through the thickness of the workpiece. toward the front of the saw during a ripping operation. -
Page 10: Features
FEATURES PRODUCT SPECIFICATIONS Cutting Capacity with Miter at 0°/Bevel 0°: Blade Diameter......12 in. Maximum nominal lumber sizes:. -
Page 11: Carrying Handle
FEATURES Carrying KNOW YOUR COMPOUND MITER SAW hanDle See Figure 1. The safe use of this product requires an understanding of the information on the tool and in this operator’s manual as loCk well as a knowledge of the project you are attempting. Before use of this product, familiarize yourself with all operating features and safety rules. - Page 12 FEATURES MITER LOCK LEVER SLIDING MITER FENCE The sliding miter fence on your compound miter saw has The miter lock lever securely locks the saw at the desired miter angle. been provided to hold your workpiece securely against when making all cuts; the left side is larger providing additional MITER ThUMBWhEEL support.
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Page 13: Tools Needed
TOOLS NEEDED The following tools (not included) are needed for making adjustments: FraMing sQuare CoMbination sQuare Fig. 6 LOOSE PARTS The following items are included with your Compound Miter Saw: Dust Bag Washer (2) Laser Guide Dust Guide ... -
Page 14: Assembly
ASSEMBLY UNPACKING WARNING: This product requires assembly. Carefully lift saw from the carton by the carrying handle Do not connect to power supply until assembly is and the saw base, and place it on a level work surface. complete. Failure to comply could result in acciden- NOTE: This tool is heavy. -
Page 15: Table Extension
ASSEMBLY NOTE: Many of the illustrations in this manual show only portions of the compound miter saw. This is intentional so that we can clearly show points being made in the illustrations. Never operate the saw without all guards securely in place and in good operating condition. TABLE ExTENSION See Figure 9. -
Page 16: Work Clamp
ASSEMBLY DUST BAG See Figure 11. A dust bag is provided for use on this miter saw. It fits over the dust guide on the upper blade guard. To install it, squeeze the two metal clips to open the mouth of the bag and slide it on the dust guide. - Page 17 ASSEMBLY TO INSTALL ThE BLADE sCrew See Figure 13. WARNING: A 12 in. blade is the maximum blade capacity of lower the saw. Never use a blade that is too thick to allow blaDe outer blade washer to engage with the flats on the guarD spindle.
- Page 18 ASSEMBLY CUTTING A SLOT IN ThE ZERO CLEARANCE WARNING: ThROAT PLATE In order to use your compound miter saw, you must cut Make sure the spindle lock button is not engaged a slot through the zero clearance throat plate to allow for before reconnecting saw into power source.
- Page 19 ASSEMBLY ADJUSTING ThE MITER LOCK LEVER See Figures 15 - 16. Prior to squaring the saw blade to the fence, check and align the miter lock lever. The blade must be set at an “unindexed” miter position other than 0°, 15°, 22.5°, 31.6°, and 45° to test.
- Page 20 ASSEMBLY Loosen the socket head screws that secure the fence to sliDing the miter table. See Figure 18. Miter Rotate the fence left or right until the saw blade is parallel FenCe with the square. Retighten the socket head screws securely and recheck the blade-to-fence alignment.
- Page 21 ASSEMBLY SQUARING ThE BLADE TO ThE MITER TABLE See Figures 22 - 25. Unplug the saw. Pull the saw arm all the way down and lock in transport position. Lift the miter lock lever. bevel Rotate the miter table until the pointer on the miter scale loCk is positioned at 0°.
- Page 22 ASSEMBLY PIVOT ADJUSTMENTS bevel stop pin NOTE: These adjustments were made at the factory and normally do not require readjustment. TRAVEL PIVOT ADJUSTMENT The saw arm should rise completely to the up position bevel stop aDJustMent sCrew by itself. ...
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Page 23: Operation
Failure to do so could result in movement of the operations, but for fine joinery cuts or cutting plastic, use one control arm or miter table while making a cut. of the accessory blades available from the RIDGID dealer. MITER ThUMBWhEEL WARNING:... - Page 24 OPERATION Cross Cut TO MITER CUT / CROSS CUT See Figures 27 - 28. A cross cut is made by cutting across the grain of the workpiece. A straight cross cut is made with the miter table set at the 0° position. Miter cross cuts are made with the miter table set at some angle other than zero.
- Page 25 OPERATION TO BEVEL CUT bevel Cut See Figure 29. A bevel cut is made by cutting across the grain of the workpiece with the blade angled to the workpiece. A straight bevel cut is made with the miter table set at the zero degree position and the blade set at an angle between -3°...
- Page 26 OPERATION CoMpounD Miter Cut TO COMPOUND MITER CUT See Figure 30. A compound miter cut is a cut made using a miter angle and a bevel angle at the same time. This type of cut is used to make picture frames, cut molding, make boxes with sloping sides, and for certain roof framing cuts.
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Page 27: Clamping Wide Workpieces
OPERATION SUPPORTING LONG WORKPIECES See Figures 31 - 32. Long workpieces need extra supports. Supports should be placed along the workpiece so it does not sag. The support should let the workpiece lay flat on the base of the saw and miter table during the cutting operation. -
Page 28: Cutting Compound Miters
OPERATION CUTTING COMPOUND MITERS To aid in making the correct settings, the compound angle setting chart below has been provided. Since compound cuts are the most difficult to accurately obtain, trial cuts should be made in scrap material, and much thought and planning made, prior to making your required cut. - Page 29 OPERATION CUTTING CROWN MOLDING The following chart illustrates the miter and bevel angle settings of the miter saw for both 52˚/38˚ and 45˚/45˚ crown molding, when the angle between the walls run from 67˚ to 146˚. With the crown molding laying flat, cut at the following angles: WALL 38˚...
- Page 30 OPERATION CUTTING CROWN MOLDING When cutting crown molding by this method the bevel angle should be set at 33.85°. The miter angle should be set at Your compound miter saw does an excellent job of cutting 31.6° either right or left, depending on the desired cut for the crown molding.
- Page 31 OPERATION Bevel Angle Type of Cut Setting Left side, inside corner 1. Top edge of molding against fence 0° 2. Miter table set right 45° 3. Save left end of cut Right side, inside corner 1. Bottom edge of molding against fence 0°...
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Page 32: Adjustments
ADJUSTMENTS aDJustMent sCrew WARNING: Before performing any adjustment, make sure the aperture tool is unplugged from the power supply. Failure to heed this warning could result in serious personal injury. laser TO ADJUST ThE LASER GUIDE Mark See Figure 37. NOTE: Avoid direct eye exposure when using the laser guide. -
Page 33: Maintenance
MAINTENANCE BRUSh REPLACEMENT WARNING: See Figure 38. The saw has externally accessible brush assemblies that When servicing, use only identical replacement should be periodically checked for wear. parts. Use of any other part may create a hazard or cause product damage. Proceed as follows when replacement is required: ... - Page 34 MAINTENANCE ChANGING ThE BATTERIES IN ThE LASER See Figure 39. Unplug the saw. Rotate and hold lower blade guard up. Using the hex key (1/16 in.) provided, loosen and remove the screw from the battery compartment then separate the cover from the laser guide.
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Page 35: Warranty
Some states do not allow limitations on how long cords, gears and even cordless batteries in this RIDGID an implied warranty lasts and/or do not allow the exclusion ®... -
Page 36: Parts Ordering/Service
R4120 Double Insulated CUSTOMER SERVICE INFORMATION For parts or service, contact your nearest RIDGID authorized service center. Be sure to provide all relevant information when you call or visit. For the location of the authorized service center nearest you, please call 1-866-539-1710 or visit us online at www.ridgid.com.