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OWNERS MANUAL
TBA & TBA CORE DRILLS
TBA & TBA CORE DRILL STAND
FORM <<7202005
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Important: Before placing equipment in operation, record the following
information.
MODEL:_________________ SERIAL NO.___________
PURCHASE FROM: _____________________________
ADDRESS: ____________________________________
CITY__________ STATE _________ ZIP ___________
TELEPHONE NO. _______________________________
Before using this equipment, make sure that person using it read and
understand the instructions in this owners manual.
TBA & TBA CORE DRILL
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CONTENTS PAGE
GENERAL INFORMATION
Warranty Infromation
I. Preparation
A. Safety Precautions 4
B. General Information 5
C. Bit Installation 5
D. Water Supply 5
E. Electrical Supply 6
II. Operation
A. Core Drill Positioning 7
B. Drilling Technique 7
C. Vacuum Hold Down Operation (Optional)
D. Water Collector Operation (Optional)
III. Maintenance and Component Description
A. Motor Specifications (Cardi)
B. Motor Specifications (Milwaukee)
C. Vacuum Pump 11
D. Leveling Screws 11
E. Carriage 11
F. Gibs 12
G. Motor Spindle 12
H. Vacuum Seal 12
I. Electrical Wiring Diagram 13
IV. Parts List Section
A. Ordering Information 14
B. Optional Accessories 14
C. Assembly Drawings 16-19
D. Service Parts List 16-19
E. Operating & Maintance Instructions Gast Vaccum Pump 20
F. Cardi Authorized Repair 23-26
G. Milwaukee Authorized Distributors 27
H. Gast Pump Authorized Distributors 28
I. Machine Service Log
Inside
Cover
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I PREPARATION
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A. Safety Precautions
IMPORTANT! THE FOLLOWING SAFETY PRECAUTIONS MUST BE OBSERVED.
1. Know your core drilling machine! Read the Operator’s manual carefully. Learn the operation,
application and limitations, as well as the specific potential hazards peculiar to this equipment.
2. Ground the machine! The core drill must be grounded while in use to protect the operator from
electric shock. The motor is equipped with a three prong grounding type plug to fit the proper type
receptacle. The green [or green & yellow] conductor in the cord is grounding wire.
3. NEVER connect the green [or green & yellow] wire to a live terminal.
4. Use only three-wire grounded extension cords suitable for use outdoors and of sufficient gage to
accommodate power requirements.
5. Replace frayed or damaged extension cords.
6. Keep the work area clean avoiding cluttered work areas.
7. Consider the work area environment!
¾ Do not expose power tools to rain.
¾ Wear rubber boots to further insulate yourself from the drill.
¾ Mop up all excessive water around the work area before and after drilling.
¾ Keep the work area well lit.
8. Use extreme caution when drilling through floors. Provide for protection of all personnel and material
below the area. Cores generally drop from the drill bit at the completion of the hole.
9. Keep visitors away. Do not let visitors contact tool or extension cord. All visitors should be kept at a
safe distance from the work area.
10. Do not force the bit into the drilling surface.
¾ Use an anchor bolt , ceiling jack or vacuum hold-down attachment when drilling vertically
(ÐÏ) into floors.
¾ Only use an anchor bolt or ceiling jack when drilling horizontally (ÕÖ) into a wall or any other
vertical surface.
11. Dress properly for the work being performed.
¾ Do not wear loose clothing or jewelry which can get caught in moving or rotating parts.
¾ Rubber gloves and non-skid footwear is recommended when working outside.
¾ Wear protective covering to contain long hair.
12. Don’t abuse the cord. Never carry the tool by the cord or yank the cord to disconnect the plug
from the receptacle.
13. Secure the drill stand to the work surface. Use an anchor bolt, ceiling jack or vacuum
attachment to secure the drill stand to the work surface.
14. NEVER stand on the drill stand base as a method of securing the drill stand!
15. Don’t overreach! Keep proper footing and balance at all times. The slippery surface created
during the drilling operation results in unstable footing.
16. ALWAYS disconnect the power before servicing or changing accessories or bits.
17. ALWAYS check, then make sure wrenches are removed from the motor spindle and bit adapter
before connecting power or starting the drill motor.
18. ALWAYS make sure power switch is in “off” position before connecting drill to power.
Caution: It is very important that the drilling machine is properly secured to the work surface. Movement
during drilling will cause bit chatter against work surface, fracturing diamonds or binding bit in the hole.
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I PREPARATION
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B. General Information
The Dr520 & Dr620 core drills are available with different power units.
MANUFACTURER AMPS VOLTS PHASEHERTZ
MILWAUKEE 15 115
Cardi 20 115
MILWAUKEE 20 115
All motors are single phase with two-speed selector switches. The 115 volt motors will
operate within a power range of 110 to 120 volts.
C. Bit Installation
The threads on the output spindle of the core drill motors have dimensions of 1-1/4"-7.
Core bits are available in a variety of diameters. The spindle thread on the adapter nut of
the core bit is 5/8-11 on smaller diameter bits. The use of an adapter coupling part
number 400148 is required in order to run smaller diameter bits. The adapter provides a
coupling which has a female 1-1/4"-7 thread on one side and a 5/8"-11 spindle on the
other end.
SINGLE
SINGLE
SINGLE
60
60
60
Core Bit Adapter
Part Number 400148
1. Using a wrench to firmly hold the output shaft , screw the core bit onto the spindle until
snug.
2. Placing one wrench on the machined flats of the output shaft and one wrench on the
end adapter of the core bit tighten the bit on the spindle. Note: Attempting to turn the
bit by the barrel rather than by the adapter nut may break the weld between the
adapter nut plate and the barrel.
D. Water Supply
It is important when wet cutting to maintain an
adequate supply of clean water to the diamond
drill bits. The hose input adapter on the water
swivel at the base of the core drill motor is used
to connect the water supply hose to the core
drilling unit. Special precautions should be
taken to insure that the water supply will not be
interrupted during the drilling operation.
Hose Input Adaptor
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I PREPARATION
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E. Electrical Supply
The DR520 & DM620 core drills are furnished with 115 volt, single phase motors. These
motors operate within a power range of 110 to 120 volts. Serious damage can result if the
supply line voltage does not fall within this range.
The following wire sizes are recommended when using an extension cord:
DISTANCE
FROM
SOURCE
Wire
Gauge
The DR520 & DR620 core drills are manufactured with a three conductor connector cord
which attaches the motor to the electrical supply. The green wire provided is used to
connect to a permanent ground.
z a. Before connecting the drill to the power source, make sure that the voltage and cycles
shown on the name plate of the motor are the same as the available electrical power
supplied.
z b. Always properly ground the core drill before attempting to start the motor. The
presence of water during the drilling operation requires that the drill always be
properly grounded.
115 volt
25
FEET
# 14
115 volt
50
FEET
# 12
115 volt
75
FEET
# 10
115 volt
100
FEET
# 08
z c. NEVERconnect the green wire to a live terminal !
The use of 3-prong adapter is prohibited in Canada
by the Canadian Electrical Code.
An adapter, Fig. "B" is available for connecting Fig.
A plugs to two prong receptacles. The green
grounding ear extending from adapter must be
connected to a permanent ground such as to
properly grounded outlet box. No adapter is
available for fig "C" plugs.
To connect twist lock plugs like those shown in
figures D and E, insert the plug into a matching
outlet. When the plug is fully inserted, turn it
clockwise until it locks. This prevents the plug from
being pulled out accidentally. To remove the plug,
twist it counterclockwise to unlock it and remove it
from the outlet.
NOTE: RECEPTACLE MUST BE GROUNDED FOR SAFE USE OF
ADAPTER:
IF IN DOUBT CALL A QUALIFIED ELECTRICIAN AND HAVE THE
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II OPERATION
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A. Core Drill Positions
To position the core drill:
1. Roll the drill so that the spindle is positioned over the desired drilling location.
2. Using the leveling screws located on the four corners of the base, level the core drill to
insure that the bit will drill a straight, vertical hole.
ÖCEILING BRACING - can be used when the ceiling above the work area is strong
enough to provide solid bracing. A length of pipe may be used with the adjustable brace
on the top of the drill column to firmly secure the drill against the work piece.
ÖANCHOR BOLTING - is a method used quite often in both horizontal and vertical drilling.
The anchor is secured in the work surface and the core drill is placed over the anchor bolt
so that the bolt goes through the hole in the center of the drill base. A nut and washer is
the used to pull the base down as the nut is screwed onto the anchor bolt.
ÖVACUUM HOLD DOWN - requires that the surface of the intended drilling area be
smooth or of an even texture in order to achieve an effective bond to the drilling surface.
A large hold down base and vacuum pump are used to fasten the drill to the work
surface. Both the pump and large base are available as optional accessories for the
drills.
B. Drilling Technique
The performance of any diamond core bit
depends heavily on the use of proper drilling
technique. Although drilling conditions and
materials may vary, following specific guide
lines insures faster drilling speeds and
longer bit life.
1. Secure the core drill to the work surface
so that there is no movement in the drill
that would cause the core bit to bind in
the hole.
2. Insure that the hole is constantly flushed
of abrasive fines by supplying a sufficient flow of water.
3. Slowly lower the bit into the hole so that there is no skidding or lateral movement of the
drill. The entire circumference of the core bit should penetrate the drilling surface
before additional pressure is applied to the handle.
4. Exert steady downward pressure while drilling. NEVER force the bit into the material!
5. Do not stop the flow of water or rotation of the bit while the core bit is drilling.
6. Check the core bit if the drilling rate decreases noticeably. The slowing penetration
rate generally indicates that the bit is in need of reconditioning.
Vacuum Pump Attachment
PART NUMBER: 407000
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II OPERATION
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C. Vacuum Hold Down Operation
The vacuum hold down base and pump work together to seal the drill to the work surface.
The vacuum pump requires 115 volt electrical supply. A 115 volt accessory outlet located
on the switch box is used to supply power to the vacuum pump. One outlet is consistently
supplied with power so that turning the motor off does not turn off the vacuum pump and
release the drill from the work surface.
1. Mount the column and carriage in the large vacuum hold down base.
2. Connect the vacuum pump to the vacuum base.
3. Wet the work area in order to achieve an effective seal.
4. Connect the vacuum pump cord into the top outlet of the receptacle in the switch box
above the motor. This will start the pump and create a seal between the base and the
work surface.
5. Adjust the leveling screws so that the core drill is level and resting lightly on the
vacuum seal.
6. Plug the vacuum pump cord into the live outlet of the receptacle in the switch box. This
will start the pump and create a seal between the base and the work surface.
7. Adjust the leveling screws so that the base is snug against the work surface. NOTE:
(Excessive tightening of the leveling screws will break the seal between the base and
the work surface).
8. To turn the vacuum pump off, unplug the power cord.
D. Water Collector Operation
The water collector unit (Part Number 402034) is designed to work with any core drill. It
can be used with any diameter core bit up to and including ten inch. The unit consists of a
tear dropped shaped ring with a rubber seal, a 115 volt electric water pump and a
drainage hose.
1. Place the pump in the small end of the tear-drop ring. Center the large area of the ring
over the area to be drilled.
2. Run the drainage hose from the pump to a drainage barrel and secure the hose to the
barrel with the hose hook.
3. PROPERLY GROUND THE PUMP, then plug it into the top outlet of the core drill
switch box.
4. Turn the pump off by unplugging the pump power cord at the cord drill switch box.
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III. MAINTENANCE AND COMPONENT DESCRIPTION
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A. Motor Specifications Cardi
MFR MODEL VOLT AMP LOW
Cardi D3-250 120 20 420 860 8"-10" 4"-7"
*Refer to motor owners manual supplied with drill for required motor maintenance.
The Cardi motor is designed to operate at two
speeds. Changing speeds is accomplished by
using the speed shift knob built into the gear
case of the unit.
Changing the rpm of the motor is
accomplished as follows:
1. Turn off switch, wait for spindle to stop then
rotate the shift knob to go from the
HIGH(••) to LOW(•) speed.
2. Move the shift knob until the clutch teeth
are fully engaged. Moving the knob toward
the single dot engages the LOW rpm while
moving the knob toward the two dots
engages the HIGH rpm.
3. Attempting to shift with the motor off may
require turning the spindle by hand to
engage the clutch.
Changing the rpm while the motor is running
will damge gears and void warranty.
Specifications
MOTOR RPM BIT CAPACITY IN
GEAR
HIGH
GEAR
LOW
GEAR
HIGH
GEAR
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III. MAINTENANCE AND COMPONENT DESCRIPTION
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The vacuum pump is used with the large vacuum hold down
base to secure the core drill on smooth evenly textured
OPTIONAL
GAST VACUUM PUMP
The required maintenance procedure for the vacuum pump is listed in the "Parts List and
Operating and Maintenance Instructions" pamphlet. Parts for the vacuum pump are
available from local distributors of Gast products. A listing of Gast distributors is available in
this drill manual and in the vacuum pump pamphlet.
B. Leveling Screws
The four leveling screws on the base should cleaned with a mild solvent
and lubricated with a lightweight machine oil each time the machine is
used. Allowing the slurry to accumulate on the threads may cause damage
to the threads in the base.
C. Carriage
The carriage or head assembly should be cleaned and lubed with a
lightweight machine oil each time the machine is put away. Allowing slurry
to build on the column and inside the carriage will prematurely wear the
pinion gear and gibs.
surfaces. The
pump is powered
by a 115 volt, 4.2
amp, 60 hertz
electric motor. The
power cord of the
pump is plugged
into the live outlet
of the receptacle in
the switch box of
the core drill. The
switch box on the
drill allows the motor on the drilling unit to be turned
on and off without shutting down the vacuum pump
and breaking the seal between the drill base and the
work surface.
COMBINATION BASE
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III. MAINTENANCE AND COMPONENT DESCRIPTION
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D. Gibs
The gibs are brass wear shims used on the inside of the carriage which
allow the carriage to slide freely and rigidly on the column. The gibs require
periodic replacement. Replacing the gibs is necessary when the carriage is
no longer rigid on the column. Keeping the column free of excess debris
and burrs will maximize the service life of the gibs.
E. Motor Spindle
The motor spindle on all core drill motors is equipped with 1-1/4"-7 thread
dimensions. The end adapter of the core bit is also threaded 1-1/4"-7 on
core bits of 2 inches and larger diameter. Core bits with a diameter less
than 1-5/8 inches have 5/8”-11 threads and require the use of an adapter.
The motor spindle maintenance should be performed each time the
machine is stored for the day. Leaving the core bit on the motor spindle
may cause the threads on the spindle to rust making removal of the core bit
very difficult. After removing the core bit check the threads for any nicks or
burrs. The spindle should then be cleaned with a mild solvent and
lubricated with a lightweight machine oil.
Removing the core bit from the motor spindle by turning the core bit barrel
is not recommended. The core bit barrel may break the weld between the
adapter plate and barrel if excessive side pressure is applied. The best
results are achieved using two wrenches. One of the wrenches placed on
the machined flats on the motor spindle and the other wrench on the core
bit end adapter.
F. Vacuum Seal
The vacuum seal is the sponge rubber gasket which lines the bottom of the
large vacuum base. The material prevents air from entering the area under
the base. Thus allowing the vacuum to pull against the work surface. In
order for the seal to work properly the seal material must remain pliable and
in one piece with no gaps or inconsistencies on the surface. The vacuum
seal should be rinsed at the completion of each operation. Allowing the
slurry to accumulate on the gasket will cause the material to deteriorate
prematurely. The vacuum seal should be checked on a regular basis and
replaced if it has been damaged or started to deteriorate.
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III. MAINTENANCE AND COMPONENT DESCRIPTION
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G Electrical Wiring Diagram
BEFORE CONNECTING DRILL TO THE POWER SOURCE, MAKE SURE THE
VOLTAGE AND CYCLES SHOWN ON THE NAME PLATE AGREE WITH THE
AVAILABLE ELECTRICAL SUPPLY!
ALWAYS PROPERLY GROUND THE CORE DRILL!
NEVER CONNECT THE GREEN WIRE TO A LIVE TERMINAL!
INTERNAL WIRING DIAGRAM
See Page 19 For Switch Box Parts Breakdown
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IV. PARTS LIST SECTION
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A. Ordering Information
1. List model number of machine.
2. List part number and description of part (not item number).
3. Wherever alternate parts are shown due to product improvement, inspect the part
you have and provide additional description as necessary.
4. Specify mode of shipping desired, such as, parcel post, truck, air freight, U.P.S.,
best way, etc.
B. Optional Accessories
1. Vacuum Hold Down:
drill on smooth evenly textured surfaces without using anchors.
2. Water Collector Kit:
the drilling operation and pumps it into a drum. The ring is used to limit the amount
of area that is exposed to water. The ring is best used in areas where the surface
texture is smooth and even.
3. Shaft Couplings: The couplings are used as adapters which decrease or increase
the spindle diameter and thread dimension.
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(GAST MODEL DOA-V185A-AA)
Do not at any time lubricate any of the parts with oil, grease, or petroleum products nor clean with acids, caustics or
chlorinated solvents. Be very careful to keep the diaphragm from contracting any petroleum product or hydro
carbons. It can affect the service life of the pump.
Danger: To prevent explosive hazard, Do NOT pump combustible liquids or vapors with these units.
Personal Injury and/or Property Damage would result.
To replace the diaphragm, remove the socket cap screws from the head of the pump. The diaphragm is held in
place by two Phillips head screws. Remove screws, retainer plate, and the diaphragm. The diaphragm will fit in any
position on the connecting rod. Replace the plate and the two Phillips head screws. Torque to 30 inch-pounds on
DOA and DAA. torque to 12 inch-pounds on MOA and MAA.
Caution: Do not raise any burrs or nicks on the heads of these screws. These burrs could cause damage to
the inlet valve.
For replacing the inlet and outlet valve, remove the slotted machine screw that holds each valve in place. The
stainless steel inlet and outlet valves are interchangeable.* Clean them with water. When replacing the outlet valve,
place the new valve in location and note there is a retaining bar near the machine screw hole. This retaining bar
holds the valve in position. When replacing the inlet valve, note that the valve holder is marked with an X in one
corner. This X should be in the lower right hand corner toward the inlet of the air chamber. Replace the head and
tighten the socket head screws to 90-100 inch-pounds of torque on DOA and DAA Torque to 30 Inch-pounds on
MOA and MAA. *DOA and DAA models only.
WARNING-The motor may be thermally protected and can automatically restart when the overload resets.
Always disconnect power source before servicing. Personal Injury and/or Property Damage could result.
Do not attempt to replace the connecting rod or motor bearings. If after cleaning the unit and/or installing a new
Service Kit, the unit still does not operate properly, contact your representative, the factory , or return the pump to
one of the GAST authorized Service Centers.
IF YOUR PUMP IS EQUIPPED WITH PLASTIC PLUGS IN THE EXHAUST AND/OR INTAKE PORTS, REMOVE
BEFORE STARTING UNIT.
WIRING INFORMATION
For any D.C. unit-red lead goes to positive side of power source.
For any permanent split capacitor motor which has four leads(4) leads is
as follows:
Brown leads to capacitor.
Black leads to Power Source.
For any permanent split capacitor for DOA & DAA motor which has (3)
leads is as follows: Figure 3
DO NOT ATTEMPT AT ANY TIME TO REMOVE THE CONNECTING ROD OR COMPLETELY
DISASSEMBLE THE PUMP. IF IT DOES NOT GIVE YOU THE PROPER SERVICE EVEN AFTER
INSTALLING A NEW SERVICE KIT, PLEASE RETURN IT TO ONE OF THE AUTHORIZED GAST
SERVICE CENTERS LISTED IN THE SERVICE CENTER PAGES.
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OPTIONAL
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VACUUM PUMP
GAST MODEL DOA-P101-AA
Parts available from local GAST distributors
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GAST PUMP MODEL DOA-P101-AA
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Parts for vacuum pump available through local GAST PUMP distributors
GAST MANUFACTURING COMPANY., LTD
Halifax Road, Cressex Estate
High Wycombe, Bucks HP12 3SN
England
High Wycombe 23571
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MILWAUKEE POWER TOOL SERVICE CENTERS
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ANAHEIM
1130 North Magnolia Street
Anaheim, California 92801
Phone: 714 827-3970
213 624-7615
213 860-0349
ATLANTA
2381 John Glenn Drive
Suite 102
Chamblee, Georgia 30341
Phone: 404 455-7300
BOSTON
143 California Street
Newton, Massachusetts 02158
Phone: 617 244-4483
CHICAGO
7315 North Monticello Avenue
Skokie, Illinois 60076
Phone: 312 539-9173
CLEVLAND
7600 Wall Street
Cleveland, Ohio 44125
Phone: 216 524-8040
KANSAS CITY
1506 Topping
Kansas City Missouri 64120
Phone: 816 241-7300
MIAMI
8101 North West 33rd Street
Miami, Florida 33122
Phone: 305 592-0442
MILWAUKEE
4057 North 128th Street
Brookfield, Wisconsin 53005
Phone: 414 781-0951
MINNEAPOLIS
2200 West 94th Street
Bloomington, Minnesota 55431
Phone 612 884-7258
NEW YORK
27-07 Brooklyn Queens Expressway W.
Woodside, New York 11377
Phone: NY 212 721-5151
NJ 201 622-7752
PHILADELPHIA
388 Reed Road
PO Box 224
Broomall, Pennsylvania 19008
Phone: 215 544-5544
Philadelphia: 215 528-6771
SAN FRANCISCO
329 Littlefield Avenue
South San Francisco, California 94080
Phone: 415 583-8484
San Francisco: 415 761-2851
SEATTLE
503 South Michigan Street
PO Box 80346
Seattle, Washington 98108
Phone: 206 762-8430
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CARDI Core Drill Motor Model D3-250
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CARDI Core Drill Motor Model D3-250
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*Contact Factory for availability of parts.
Page 39
I . Machine Service Log
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