Sears craftsman 315.101390 User manual

OWNER'S
MANUAL
Thank You for Buying A
Craftsman Hammer Drill
SAVE THIS
MANUAL FOR
FUTURE REFERENCE
SEARS, ROEBUCK AND CO., Hoffman Estates, IL 60179 U.S.A.
972000-148
9-00 Printed In U.S.A.
1/2 Inch
Hammer Drill
DOUBLE INSULATED
Rules for Safe Operation
Warranty
Operation
Maintenance
Repair Parts
MODEL NO.
315.101390
CAUTION:
Read and follow
ALL safety rules
and instructions
before operating
this equipment.
®

Page 2
RULES FOR SAFE OPERATION
DOUBLE INSULATION is a concept in safety, in electric
power tools, which eliminates the need for the usual three
wire grounded power cord and grounded supply system.
Wherever there is electric current in the tool there are two
complete sets of insulation to protect the user. All exposed
metalpartsareisolatedfrominternalmetalmotorcomponents
with protecting insulation.
IMPORTANT - Servicing of a tool with double insulation
requires extreme care and knowledge of the system and
should be performed only by a qualified service technician.
For service we suggest you return the tool to your nearest
SearsStoreforrepair.Alwaysuseoriginalfactoryreplacement
parts when servicing.
WARNING:
Do not attempt to operate this tool until you have read
thoroughly and understand completely all instructions,
safety rules, etc. contained in this manual. Failure to
comply can result in accidents involving fire, electric
shock, or serious personal injury. Save owner's manual
and review frequently for continuing safe operation, and
instructing others who may use this tool.
READ ALL INSTRUCTIONS
1. KNOW YOUR POWER TOOL. Read owner's
manual carefully. Learn its applications and
limitationsaswellasthespecificpotentialhazards
related to this tool.
2. GUARD AGAINST ELECTRICAL SHOCK by
preventing body contact with grounded surfaces.
Forexample:Pipes,radiators,ranges,refrigerator
enclosures.
3. KEEP GUARDS IN PLACE and in working order.
4. KEEPWORKAREACLEAN.Clutteredareasand
benches invite accidents.
5. AVOIDDANGEROUSENVIRONMENT.Don't use
power tool in damp or wet locations or expose to
rain. Keep work area well lit.
6. KEEP CHILDREN AND VISITORS AWAY. All
visitors should wear safety glasses and be kept a
safe distance from work area. Do not let visitors
contact tool or extension cord.
7. STORE IDLE TOOLS. When not in use tools
should be stored in a dry and high or locked-up
place - out of the reach of children.
8. DON'T FORCE TOOL. It will do the job better and
safer at the rate for which it was designed.
9. USE RIGHT TOOL. Don't force small tool or
attachmenttodothejobofaheavydutytool.Don't
usetool for purposenot intended -for example -A
circular saw should never be used for cutting tree
limbs or logs.
10. WEAR PROPER APPAREL. Do not wear loose
clothing or jewelry that can get caught in tool's
moving parts and cause personal injury. Rubber
gloves and non-skid footwear are recommended
when working outdoors. Wear protective hair
coveringtocontainlonghairandkeepitfrombeing
drawn into nearby air vents.
11. ALWAYS WEAR SAFETY GLASSES. Everyday
eyeglasseshaveonlyimpact-resistantlenses;they
are NOT safety glasses.
12. PROTECT YOUR LUNGS. Wear a face mask or
dust mask if operation is dusty.
13. PROTECT YOUR HEARING. Wear hearing
protection during extended periods of operation.
14. DON'TABUSECORD.Nevercarrytoolbycordor
yank it to disconnect from receptacle. Keep cord
from heat, oil and sharp edges.
15. SECURE WORK. Use clamps or a vise to hold
work. Both hands are needed to operate the tool.
16. DON'T OVERREACH. Keep proper footing and
balance at all times. Do not use on a ladder or
unstable support.
17. MAINTAINTOOLSWITHCARE.Keeptoolssharp
at all times, and clean for best and safest
performance. Follow instructions for lubricating
and changing accessories.
18. DISCONNECT TOOLS. When not in use, before
servicing,or whenchanging attachments, blades,
bits,cutters, etc., all tools should be disconnected
from power supply.
19. REMOVECHUCKKEY.Formhabitofcheckingto
see that chuck key is removed from chuck before
turning tool on.
20. AVOID ACCIDENTAL STARTING. Don't carry
plugged-in tools with finger on switch. Be sure
switch is off when plugging in.
WARNING:
The double insulated system is intended to protect the
user from shock resulting from a break in the tool's
internal wiring. Observe all normal safety precautions
related to avoiding electrical shock.

Page 3
RULES FOR SAFE OPERATION (Continued)
21. MAKE SURE YOUR EXTENSION CORD IS IN
GOOD CONDITION. When using an extension
cord,besuretouseoneheavyenoughtocarrythe
currentyourproductwilldraw.Anundersizedcord
will cause a drop in line voltage resulting in loss of
powerandoverheating.Awiregagesize(A.W.G.)
of at least 16 is recommended for an extension
cord 100 feet or less in length. A cord exceeding
100 feet is not recommended. If in doubt, use the
next heavier gage. The smaller the gage number,
the heavier the cord.
22. OUTDOOR USE EXTENSION CORDS. When
tool is used outdoors, use only extension cords
suitableforuseoutdoors.Outdoorapprovedcords
are marked with the suffix W-A, for example -
SJTW-A or SJOW-A.
23. KEEP BITS CLEAN AND SHARP. Sharp bits
minimize stalling and kickback.
24. KEEP HANDS AWAY FROM DRILLING AREA.
Keep hands away from bits. Do not reach
underneathworkwhilebitisrotating.Donotattempt
to remove material while bit is rotating.
25. NEVERUSEINANEXPLOSIVEATMOSPHERE.
Normal sparking of the motor could ignite fumes.
26. INSPECT TOOL CORDS PERIODICALLY and if
damaged, have repaired at your nearest Sears
Repair Center. Stay constantly aware of cord
location.
27. INSPECTEXTENSIONCORDSPERIODICALLY
and replace if damaged.
28. KEEP HANDLES DRY, CLEAN, AND FREE
FROM OIL AND GREASE. Always use a clean
cloth when cleaning. Never use brake fluids,
gasoline,petroleum-basedproductsoranystrong
solvents to clean your tool.
29. STAYALERT.Watchwhatyouaredoinganduse
commonsense. Donot operatetool when you are
tired. Do not rush.
30. CHECKDAMAGEDPARTS.Beforefurtheruseof
the tool, a guard or other part that is damaged
shouldbecarefullycheckedtodeterminethatitwill
operateproperlyandperformitsintendedfunction.
Check for alignment of moving parts, binding of
moving parts, breakage of parts, mounting, and
any other conditions that may affect its operation.
A guard or other part that is damaged should be
properly repaired or replaced by an authorized
service center unless indicated elsewhere in this
instruction manual.
31. DO NOT USE TOOL IF SWITCH DOES NOT
TURN IT ON AND OFF. Have defective switches
replaced by an authorized service center.
32. DRILLING INTO ELECTRICAL WIRING IN
WALLS CAN CAUSE DRILL BIT AND CHUCK
TOBECOMEELECTRICALLYLIVE.Donottouch
the chuck or metal housing when drilling into a
wall; grasp only the insulated handle(s) provided
on the tool.
33. INSPECT FOR and remove all nails from lumber
before drilling.
34. DRUGS, ALCOHOL, MEDICATION. Do not
operate tool while under the influence of drugs,
alcohol, or any medication.
35. WHEN SERVICING USE ONLY IDENTICAL
CRAFTSMAN REPLACEMENT PARTS.
36. POLARIZEDPLUGS. Toreducetheriskofelectric
shock, this tool has a polarized plug (one blade is
widerthantheother).Thisplugwillfitinapolarized
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 the proper
outlet. Do not change the plug in any way.
37. SAVE THESE INSTRUCTIONS. Review them
frequently and use them to instruct others who
may use this tool. If you loan someone this tool,
loan them these instructions also.
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,
• crystallinesilica frombricksand cementandother
masonry products, and
• arsenic and chromium from chemically-treated
lumber.
Yourriskfromtheseexposuresvaries,dependingon
how often you do this type of work. To reduce your
exposuretothesechemicals:workinawellventilated
area, and work with approved safety equipment,
suchasthosedustmasksthatarespeciallydesigned
to filter out microscopic particles.

Page 4
INTRODUCTION
CONGRATULATIONS AND THANK YOU FOR BUYING
THIS CRAFTSMAN 1/2 INCH HAMMER DRILL. It has
been designed, engineered and manufactured to provide
you with Sears high standard of dependability, ease of
operation,and operator safety.Properly cared for, it will give
you years of rugged, trouble-free performance.
CAUTION:
Carefully read through this entire owner's manual before
using your new hammer drill. Pay close attention to the
RulesFor Safe Operation,Warningsand Cautions. Ifyou
use your drill properly and only for what it is intended,
you will enjoy years of safe, reliable service.
Your hammerdrill has manyfeatures for making yourdrilling
operations more pleasant and enjoyable. Safety,
performance,and dependability havebeen given toppriority
in the design of this drill making it easy to maintain and
operate.
SPECIFICATIONS:
Chuck 1/2 In. Chuck With Chuck Key
Chuck Capacity 5/64 In. To 1/2 In.
Horsepower 3/8
Rating 120 Volts, 60 Hz, AC only, 3.5 AMPS
No Load Speed 0 - 1200 RPM
Hammer Speed 0 - 19,200 BPM
Hammer Travel .025
Switch Adjustable Variable Speed/Reversible
TABLE OF CONTENTS
1. Rules for Safe Operation ............................................................................ 2-3
2. Introduction and Product Specifications......................................................... 4
3. Warranty and Table of Contents..................................................................... 4
4 Operation...................................................................................................5-11
5. Maintenance and Accessories ..................................................................... 12
6. Exploded View and Parts List ................................................................. 14-15
7. Parts Ordering / Service............................................................................... 16
FULL ONE YEAR WARRANTY ON CRAFTSMAN HAMMER DRILL
IfthisCraftsmanHammerDrillfailstogivecompletesatisfactionwithinoneyearfromthedateofpurchase,RETURN
IT TO THE NEAREST SEARS STORE IN THE UNITED STATES, and Sears will repair it, free of charge.
Ifthis Craftsman Hammer Drill isused for commercialor rental purposes,this warranty applies for only90 days from
the date of purchase.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Sears, Roebuck and Co., DEPT. 817 WA, Hoffman Estates, IL 60179
SAFETY GLASSES
SAFETY GLASSES
FORESIGHT IS BETTER
THAN NO SIGHT
FORESIGHT IS BETTE
R
THAN NO SIGHT
WEAR YOUR
The operation of any hammer drill can result in foreign objects being thrown into your eyes,
which can result in severe eye damage. Before beginning power tool operation, always wear
safety goggles or safety glasses with side shields and a full face shield when needed. We
recommendWideVisionSafetyMaskforuse overeyeglassesorstandardsafetyglasseswith
side shields, available at Sears Retail Stores.
WARNING:
Lookforthissymboltopointoutimportantsafetyprecautions.
It means attention!!! Your safety is involved.

Page 5
LOCK-ON
BUTTON
OPERATION
Fig. 1
WARNING:
Always wear safety goggles or safety glasses with side
shieldswhenoperatingyourhammerdrill.Failuretodoso
could result in dust, shavings, loose particles or foreign
objects being thrown into your eyes, causing possible
serious injury.
KNOW YOUR HAMMER DRILL
Before attempting to use your hammer drill, familiarize
yourselfwithalloperatingfeaturesandsafetyrequirements.
See Figure 1.
WARNING:
Ifanypartsaremissing, donotoperateyourhammer drill
untilthemissingpartsarereplaced.Failuretodosocould
result in possible serious personal injury.
ELECTRICAL CONNECTION
Your hammer drill has a precision built electric motor. It
should be connected to a power supply that is 120 volts,
60 Hz, AC only (normal household current). Do not
operate this tool on direct current (DC). A voltage drop of
more than 10 percent will cause a loss of power and the
motor will overheat. If your tool does not operate when
plugged into an outlet, double-check the power supply.
WARNING:
Donotallowfamiliaritywithyourhammerdrilltomakeyou
careless. Remember that a careless fraction of a second
is sufficient to inflict severe injury.
TO REMOVE
TO STORE
CHUCK KEY
STORAGE AREA
CHUCK
KEY
CHUCK
VARIABLE SPEED
CONTROL SELECTOR
DEPTH
GAGE ROD
AUXILIARY
HANDLE
SWITCH
TRIGGER
DEPTH
GAGE CLAMP

Page 6
OPERATION
SWITCH
See Figure 2.
To turn your hammer drill ON, depress the switch trigger.
Release switch trigger to turn your hammer drill OFF.
LOCK-ON BUTTON
See Figure 2.
Yourhammerdrillisequippedwitha"lock-on"feature,which
is convenient when continuous drilling for extended periods
of time is required. To lock-on, depress the switch trigger,
pushinandholdthelock-onbuttonlocatedonthesideofthe
handle, then release switch trigger. Release lock-on button
and your drill will continue running.
To release the lock, depress the switch trigger and release
it.
If you have the "lock-on" feature engaged during use and
your drill becomes disconnected from power supply,
disengage the "lock-on" feature immediately.
WARNING:
Before connecting your hammer drill to power supply
source, always check to be sure it is not in "lock-on"
position (depress and release switch trigger). Failure to
do so could result in accidental starting of your drill
resulting in possible serious injury. Also, do not lock the
trigger on jobs where your drill may need to be stopped
suddenly.
REVERSIBLE
See Figure 3.
Your hammer drill has the feature of being reversible. The
direction of chuck rotation is controlled by a lever located
above the switch trigger. With your drill held in normal
operatingposition,the rotationlever shouldbepositioned to
the left of the switch for drilling. The direction of rotation is
reversed when the lever is to the right of the switch.
THE DESIGN OF THE SWITCH WILL NOT PERMIT
CHANGINGTHEDIRECTIONOFROTATIONWHILETHE
DRILL IS RUNNING. RELEASE THE SWITCH TRIGGER
AND ALLOW THE DRILL TO STOP BEFORE CHANGING
ITS DIRECTION.
NOTE: YOUR HAMMER DRILL WILL NOT RUN UNLESS
THE SWITCH LEVER IS PUSHED FULLY TO THE LEFT
OR RIGHT.
CHUCK KEY
See Figure 4.
A chuck key has been provided for use when installing or
removingbits.Itisalsousedwhenremovingthechuck.(See
chuck removal section).
CHUCK KEY STORAGE
See Figure 4.
Whennot in use, the chuckkey can beplaced in thestorage
area located on the bottom portion of drill handle. Fig. 4
Fig. 2
Fig. 3
SWITCH
TRIGGER
LOCK-ON
BUTTON
REVERSE FORWARD
FORWARD-REVERSE LEVER
TO REMOVE
TO STORE
CHUCK KEY
STORAGE AREA

Page 7
Fig. 6
OPERATION
VARIABLE SPEED
See Figure 5.
Your hammer drill has a variable speed control selector
designed to allow operator control and adjustment of speed
and torque limits. Speed and torque can be increased or
decreased by rotating the variable speed control selector in
the direction of the arrows shown in figure 5.
NOTE: Hold your hammer drill in normal operating position
and turn the variable speed control selector clockwise to
increase the speed and torque of your hammer drill. Turn
counterclockwise to decrease the speed and torque of your
hammer drill.
If you desire to lock the switch on at a given speed, depress
the switch trigger, push in and hold the lock-on button, and
release the switch trigger. Next, adjust the variable speed
control selector until the desired speed is reached.
NOTE:IFTHEVARIABLESPEEDCONTROL SELECTOR
IS FULLY TURNED IN THE COUNTERCLOCKWISE
DIRECTION (ZERO SETTING) YOUR DRILL MAY NOT
RUN.
IF YOU DESIRE NOT TO USE THE VARIABLE SPEED
CONTROL SELECTOR, TURN IT IN THE FULL
CLOCKWISE DIRECTION. THIS WILL ALLOW THE
SPEED OF YOUR DRILL TO BE FULLY CONTROLLED
BYTHEAMOUNTOFSWITCHTRIGGERDEPRESSION.
Avoid running your hammer drill at low speeds for extended
periodsoftime.Runningatlowspeedsunderconstantusage
may cause your drill to become overheated. If this occurs,
cool your drill by running it without a load and at full speed.
Thefollowing guidelinesmay beused indetermining correct
speed for various applications:
LOW speed is ideal when minimum speed and power is
required.Forexample:startingholeswithoutcenterpunching,
driving screws, mixing paint, and drilling in ceramics.
MEDIUM speed is suitable for drilling hard metals, plastics,
and laminates.
HIGH speedproduces best resultswhen maximum power is
required. For example: drilling in wood; soft metals such as
aluminum, brass, and copper; and when using driving
accessories.
WARNING:
Your hammer drill should never be connected to power
supply when you are assembling parts, making adjust-
ments,installing or removing drill bits, orwhen not in use.
Disconnecting your drill will prevent accidental starting
that could cause serious injury.
INSTALLING AUXILIARY HANDLE
See Figure 6.
AN AUXILIARY HANDLE IS PACKED WITH YOUR DRILL
FOR EASE OF OPERATION AND TO HELP PREVENT
LOSS OF CONTROL.
Fig. 5
VARIABLE SPEED
CONTROL SELECTOR
SLOTS
TABS
MOTOR
HOUSING
DEPTH
GAGE ROD
DEPTH
GAGE CLAMP
AUXILIARY
HANDLE
TO INCREASE
SPEED
TO DECREASE
SPEED

Page 8
OPERATION
INSTALLINGAUXILIARY HANDLE (Continued)
NOTE: For convenience the screw has been trapped inside
the auxiliary handle.
■Remove depth gage clamp and auxiliary handle from
plastic bag in hammer drill box.
■Orient depth gage clamp so that the tabs will fit into
motor housing of hammer drill.
■Threaddepth gage clamponto auxiliary handle untilit
reaches undercut area of screw threads. Undercut of
screwthreadswillkeepdepthgage clamponauxiliary
handle, preventing it from getting lost.
■Align tabs on depth gage clamp with slots in threaded
hole in motor housing. NOTE: Depth gage clamp can
berotated 180°sothat depth gagerod willfit oneither
side of motor housing.
■Carefully start the fine screw threads (#3/8-24) into
fine threaded hole in motor housing and tighten
securely. DO NOT cross thread handle bolt in motor
housing.
To prevent thread damage and possible loss of control,
auxiliaryhandleshouldbecheckedperiodicallyfortightness.
DO NOT operate hammer drill with handle loose or with
depth gage clamp removed. In addition to securing depth
gage rod to your hammer drill, depth gage clamp also
provides the proper amount of handle screw thread
engagement when depth gage rod is not being used.
USING DEPTH GAGE ROD
See Figure 7.
Adepthgage rodhas beenpackedwith yourhammer drillto
assist you in controlling the depth of drilled holes.
■Installdepthgagerodthrudepthgageclampasshown
in figure 7.
■Adjust depth gage rod so that the drill bit extends
beyondtheendoftherodtotherequireddrillingdepth.
■Securely tighten auxiliary handle against depth gage
clamp. This secures depth gage rod at desired depth
of cut. It also secures auxiliary handle.
When drilling holes with the depth gage rod installed, the
desiredholedepthhasbeenreachedwhentheendoftherod
comes in contact with the surface of the material being
drilled.
TO ADJUST DRILLING MODE
See Figure 8.
To adjust for type of drilling, slide adjustment button on side
of motor housing up to hammer mode or down to drilling
mode. For your convenience a hammer symbol and drill bit
symbol have been molded into adjustment button.
WARNING:
Your hammer drill has not been designed for reverse
hammering.
Fig. 7
Fig. 8
TO LOOSEN AUXILIARY
HANDLE AND CLAMP
TO
TIGHTEN
AUXILIARY
HANDLE
AND CLAMP
DEPTH
GAGE
CLAMP
DRILLING
DEPTH
TO
INCREASE
DRILLING
DEPTH
TO
DECREASE
DRILLING
DEPTH
DEPTH
GAGE
ROD
DRILL
BIT
PUSH DOWN FOR
DRILLING MODE
ADJUSTMENT
BUTTON
PUSH UP FOR
HAMMER MODE
We recommend that you use carbide-tipped bits and select
hammer mode when drilling in hard materials such as brick,
tile, concrete, etc.
We recommend that you select normal drill mode when
drilling with twist drills, hole saws, etc. in soft materials.

Page 9
OPERATION
TO INSTALL BITS
See Figure 9.
■UNPLUG YOUR HAMMER DRILL.
WARNING:
Failure to unplug your hammer drill could result in
accidental starting causing serious injury.
■Open or close the chuck jaws to a point where the
opening is slightly larger than the drill bit you intend to
use.Also,raisethefrontofyourdrillslightlytokeepthe
drill bits from falling out of the chuck jaws.
■Insert drill bit into chuck the full length of the jaws.
WARNING:
Donot insert drillbit into chuckjaws and tightenas shown
in figure 10. This could cause drill bit to be thrown from
your drill resulting in possible serious personal injury or
damage to your chuck.
■Tighten chuck jaws securely, using the chuck key
provided. DO NOT USE A WRENCH TO TIGHTEN
OR LOOSEN THE CHUCK JAWS.
■Remove chuck key and return to storage area.
TO REMOVE BITS
■UNPLUG YOUR HAMMER DRILL.
WARNING:
Failure to unplug your hammer drill could result in
accidental starting causing serious injury.
■Loosen chuck jaws using the chuck key provided.
DO NOT USE A WRENCH TO TIGHTEN OR
LOOSEN THE CHUCK JAWS.
■Remove drill bit from chuck jaws.
■Remove chuck key and return it to storage area.
CHUCK
CHUCK
JAWS
DRILL
BIT
RIGHT Fig. 9
WRONG Fig. 10

Page 10
OPERATION
■Begindrillingataverylowspeedtopreventthebitfrom
slipping off the starting point.
■Maintain a speed and pressure which allows cutting
without overheating the bit. Applying too much pres-
sure will:
Overheat the drill;
Wear the bearings;
Bend or burn bits; and
Produce off-center or irregular shaped holes.
■Whendrillinglargeholesinmetal,werecommendthat
youdrillwithasmallbitfirst,thenfinishwithalargerbit.
Also, lubricate the bit with oil to improve drilling action
and increase bit life.
MASONRY DRILLING
■For maximum performance use carbide-tipped ma-
sonry impact bits when drilling holes in brick, tile,
concrete, etc.
■Slide adjustment button on hammer drill up for ham-
mer mode.
■Apply light pressure and medium speed for best re-
sults in brick.
■Apply additional pressure for hard materials such as
concrete.
■Whendrilling holes in tile, practice on a scrap piece to
determine the best speed and pressure.
DRILLING
See Figure 11.
■Depressandreleaseswitchtriggertobesureyourdrill
isinOFFpositionbeforeconnectingittopowersupply.
■Checkthe direction ofrotation lever forcorrect setting
(forward or reverse). See Figure 3.
■Secure the material to be drilled in a vise or with
clamps to keep it from turning as the drill bit rotates.
■Plug your hammer drill into power supply source.
■Holdyour drill firmlyand placebit atpoint tobe drilled.
■Depress the switch trigger to start your drill. Do not
lock the switch ON for jobs where your drill may need
to be stopped suddenly.
■Move the drill bit into the workpiece applying only
enough pressure to keep the bit cutting. Do not force
yourdrillorapplysidepressuretoelongate a hole. Let
your drill and bit do the work. See Figure 11.
WARNING:
Be prepared for binding or breakthrough. When these
situations occur, drill has a tendency to grab and kick in
theoppositedirectionand could causelossofcontrol when
breaking through material. This loss of control can result
in possible serious injury. Do not lock the trigger on jobs
where your drill may need to be stopped suddenly.
When drilling hard, smooth surfaces use a center punch to
mark the desired hole location. This will prevent the drill bit
from slipping off center as the hole is started.
When drilling metals, use a light oil on the drill bit to keep it
from overheating. The oil will prolong the life of the bit and
increase the drilling action.
If the bit jams in the workpiece or if your drill stalls, stop the
tool immediately. Remove the bit from the workpiece and
determine the reason for jamming.
WOOD DRILLING
■For maximum performance use high speed steel bits
for wood drilling.
■Slide adjustment button on hammer drill down for
normal drilling action.
■Begindrillingataverylowspeedtopreventthebitfrom
slipping off the starting point. Increase the speed as
the drill bit bites into the material.
■When drilling through holes, place a block of wood
behind the workpiece to prevent ragged or splintered
edges on the back side of the hole.
■Do not lock the trigger ON for jobs where your
hammer drill may need to be stopped suddenly.
METAL DRILLING
■For maximum performance use high speed steel bits
for metal or steel drilling.
■Slide adjustment button on hammer drill down for
normal drilling action (drill mode).
Fig. 11