Grizzly G0643 User manual
MODEL G0643
21-BIT LINE BORING MACHINE
OWNER'S MANUAL
COPYRIGHT © NOVEMBER, 2007 BY GRIZZLY INDUSTRIAL, INC., REVISED MARCH, 2008 (TS)
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#TS9905 PRINTED IN TAIWAN
Table of Contents
SECTION 5: ACCESSORIES ......................... 22
SECTION 6: MAINTENANCE ......................... 23
Schedule ...................................................... 23
Cleaning ....................................................... 23
Lubrication ................................................... 23
Air Filter Reservoir ....................................... 25
SECTION 7: SERVICE ................................... 26
Troubleshooting ........................................... 26
Adjusting Headstock Limit Switch ................ 28
Adjusting Table Parallel to Boring Head ...... 29
Aligning Boring Bit Height ............................ 30
Electrical Components ................................. 31
Wiring Diagrams .......................................... 32
SECTION 8: PARTS ....................................... 34
Column Breakdown ..................................... 34
Air System Breakdown ................................ 36
Electrical System Breakdown ...................... 38
Table Breakdown ......................................... 40
Cabinet & Tools Breakdown ........................ 42
Boring Head Breakdown .............................. 44
Label Placement & List ................................ 46
WARRANTY AND RETURNS ........................ 49
INTRODUCTION ............................................... 2
Foreword ........................................................ 2
Contact Info ................................................... 2
Machine Data Sheet ...................................... 3
Identification ................................................... 4
SECTION 1: SAFETY ....................................... 5
Safety Instructions for Machinery .................. 5
Additional Safety Instructions for
Line Boring Machines .................................... 7
SECTION 2: CIRCUIT REQUIREMENTS ........ 8
Rewiring to 110V ........................................... 9
SECTION 3: SETUP ....................................... 10
Setup Safety ................................................ 10
Items Needed for Setup ............................... 10
Unpacking .................................................... 10
Inventory ...................................................... 11
Clean Up ...................................................... 11
Site Considerations ...................................... 12
Mounting to Shop Floor ............................... 12
Moving & Placing Base Unit ........................ 13
Assembly ..................................................... 14
Test Run ...................................................... 16
SECTION 4: OPERATIONS ........................... 17
Operation Safety .......................................... 17
Installing Boring Bits .................................... 17
Adjusting Downfeed Speed ......................... 18
Adjusting Drilling Depth ............................... 19
Adjusting Hold-down Height ........................ 20
Positioning the Workpiece ........................... 20
Drilling Overview .......................................... 21
-2- Model G0643 21-Bit Line Boring Machine
INTRODUCTION
Foreword
We are proud to offer the Model G0643 21-Bit
Boring Machine. This machine is part of a grow-
ing Grizzly family of fine woodworking machinery.
When used according to the guidelines set forth in
this manual, you can expect years of trouble-free,
enjoyable operation and proof of Grizzly’s commit-
ment to customer satisfaction.
The specifications, drawings, and photographs
illustrated in this manual represent the Model
G0643 when the manual was prepared. However,
owing to Grizzly’s policy of continuous improve-
ment, changes may be made at any time with no
obligation on the part of Grizzly.
For your convenience, we always keep current
Grizzly manuals available on our website at
www.grizzly.com. Any updates to your machine
will be reflected in these manuals as soon as they
are complete. Visit our site often to check for the
latest updates to this manual!
If you have any comments regarding this manual,
please write to us at the address below:
Grizzly Industrial, Inc.
C/O Technical Documentation Manager
P.O. Box 2069
Bellingham, WA 98227-2069
Email: [email protected]
We stand behind our machines. If you have any
service questions or parts requests, please call or
write us at the location listed below.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: (570) 546-9663
Fax: (800) 438-5901
E-Mail: [email protected]
Web Site: http://www.grizzly.com
Contact Info
Model G0643 21-Bit Line Boring Machine -3-
Machine Data Sheet
machine data sheet
-4- Model G0643 21-Bit Line Boring Machine
Figure 1. Model G0643 identification.
A. Longitudinal Fence and Scale
B. Workpiece Hold-down
C. Indexing Pin
D. Emergency Stop Button
E. Power On Button and Lamp
F. Motor 2 HP
G. Lifting Eye Bolt
H. Headstock Limit Switch
Identification
A
CD
E
F
H
I
L
M
N
O
I. Electrical Box
J. Boring Head
K. Cross Fence Locking Lever
L. Longitudinal Fence Locking Lever & Stop
M. Table
N. Foot Switch
O. Cross Fence and Scale
K
B
J
G
Model G0643 21-Bit Line Boring Machine -5-
Safety Instructions for Machinery
-6- Model G0643 21-Bit Line Boring Machine
Model G0643 21-Bit Line Boring Machine -7-
No list of safety guidelines can be complete.
Every shop environment is different. Always
consider safety first, as it applies to your
individual working conditions. Use this and
other machinery with caution and respect.
Failure to do so could result in serious per-
sonal injury, damage to equipment, or poor
work results.
Like all machinery there is potential danger
when operating this machine. Accidents are
frequently caused by lack of familiarity or
failure to pay attention. Use this machine
with respect and caution to lessen the pos-
sibility of operator injury. If normal safety
precautions are overlooked or ignored, seri-
ous personal injury may occur.
Additional Safety Instructions for
Line Boring Machines
1. EYE/FACE/HAND PROTECTION. Debris
from the drilling operation can be thrown at
the operator. Always wear safety glasses or
a face shield to protect your eyes and face
during boring operations. The spinning bor-
ing bits are sharp and can seriously dam-
age hands. Always keep hands and fingers
away from the moving drill bits. DO NOT
wear gloves when operating this machine.
2. GUARDS. The boring head guard reduces
the risk of debris being thrown at the opera-
tor. DO NOT operate this machine with the
boring head guards removed.
3. BORING OPERATION. The boring bits
rotate with tremendous torque, especially
at start up. To avoid the bits grabbing
the workpiece and unexpectedly moving it,
never start the machine with the boring bits
pressed against the workpiece.
4. DULL OR WORN BITS. Dull or damaged
bits may break apart during operation, be
thrown at the operator, or reduce the perfor-
mance of the operation. Inspect bits before
each use. DO NOT operate with dull or
damaged bits.
5. SECURING WORKPIECE. The operator's
hands may be drawn into the spinning bor-
ing bits if the workpiece or table moves
unexpectedly during operation. Make sure
the fences are locked in place, the workpiece
is firmly against the longitudinal fence, and
the workpiece is fully supported.
6. BORING BITS. A rapidly spinning boring bit
can be thrown into the operator if it comes
loose from the chuck during operation. Only
use standard boring bits with a 10mm shank
designed for this machine. Properly secure
the bits in the chucks before beginning
operations. Make sure the chuck and the
installed boring bit are designed to rotate in
the same direction.
7. SURFACE/WORKPIECE PREPARATION.
Never turn the machine ON before clearing
the table of all tools, scrap wood, etc. Only
drill wood products that are free of imper-
fections or foreign objects. Never use this
machine to drill metal.
8. EXPERIENCING DIFFICULTIES. If at any
time you are experiencing difficulties per-
forming the intended operation, stop using
the machine! Contact our Technical Support
at (570) 546-9663.
-8- Model G0643 21-Bit Line Boring Machine
Full Load Amperage Draw
Motor Draw at 110V ........................... 20.8 Amps
Motor Draw at 220V (prewired) ......... 10.4 Amps
Circuit Requirements
You MUST connect your machine to a grounded
circuit that is rated for the amperage given below.
Never replace a circuit breaker on an existing cir-
cuit with one of higher amperage without consult-
ing a qualified electrician to ensure compliance
with wiring codes. If you are unsure about the
wiring codes in your area or you plan to con-
nect your machine to a shared circuit, consult
a qualified electrician.
Minimum 110V Circuit ........................... 30 Amps
Minimum 220V Circuit (pre-wired) .........15 Amps
SECTION 2: CIRCUIT REQUIREMENTS
Serious personal injury could occur if you
connect the machine to power before com-
pleting the setup process. DO NOT connect
the machine to the power until instructed
later in this manual.
Electrocution or fire could
result if machine is not
grounded and installed in
compliance with electrical
codes. Compliance MUST
be verified by a qualified
electrician!
NOTICE
The Model G0643 is prewired for 220V,
single-phase. If you plan to operate the
machine at 110V, the motor must be rewired,
and the 110V version of the electrical box
and ON switch must be installed. Refer to
Rewiring to 110V on Page 9 for detailed
instructions.
circuit requirements
Power Connection Device
The power connection device depends on the
type of installed or planned service. We recom-
mend using one of the devices shown in Figure 2,
depending on the voltage being used.
Extension Cords
Using extension cords may reduce the life of the
motor. Instead, place the machine near a power
source. If you must use an extension cord:
• For 110V, use at least a 10 gauge cord that
does not exceed 50 feet in length.
• For 220V, use at least a 14 gauge cord that
does not exceed 50 feet in length.
• The extension cord must have a ground wire
and plug pin.
Figure 2. Recommended plug types.
L5-30 Plug & Outlet
for 110V
6-15 Plug & Outlet
for 220V
Model G0643 21-Bit Line Boring Machine -9-
Rewiring to 110V
rewiring to 110v
The Model G0643 can be converted for 110V
operation. This conversion job consists of dis-
connecting the machine from the power source,
replacing the electrical box, replacing the ON but-
ton/lamp, and rewiring the motor for 110V opera-
tion.
The necessary electrical box and ON button/
lamp for this procedure is the Model G0643 110V
Conversion Kit (Part No. P0643222), and can be
purchased by calling Grizzly Customer Service at
(800) 523-4777.
All wiring changes must be inspected by a quali-
fied electrician before the boring machine is con-
nected to the power source. If, at any time during
this procedure you need help, call Grizzly Tech
Support at (570) 546-9663.
To rewire the Model G0643 for 110V opera-
tion:
1. DISCONNECT THE BORING MACHINE
FROM POWER!
2. Remove the electrical box and replace it with
the one included in the 110V Conversion Kit.
Refer to the Electrical Box Wiring Diagram
on Page 32 for a detailed connection illustra-
tion.
3. Verify that the amperage setting on the ther-
mal overload relay is set at 20 amps (see
Figure 3).
4. Open the control panel cover and remove
the ON button/lamp. Replace it with the one
included in the 110V conversion kit.
5. Rewire the motor for 110V operation as shown
on the diagram located inside the motor junc-
tion box, and close the control panel cover.
Note: The Motor, Control Panel, and Limit
Switch Wiring Diagram on Page 33 was
current at the time of printing, but always
use the motor wiring diagram provided inside
the motor junction box, as it will reflect any
changes to the motor shipped with your
machine.
Figure 3. 110V thermal overload relay set at 10
amps.
-10- Model G0643 21-Bit Line Boring Machine
This machine presents
serious injury hazards
to untrained users. Read
through this entire manu-
al to become familiar with
the controls and opera-
tions before starting the
machine!
Setup Safety
SECTION 3: SETUP
The following items are needed to complete the
setup process, but are not included with your
machine:
Description Qty
• Assistant (for moving machine) .................. 1
• Straightedge 4' (or longer) ......................... 1
• Accurate Level ............................................ 1
• Standard Pneumatic Tool Oil ..... As Needed
• Face Shield (for each person) .................... 1
• Air Compressor (70 PSI) ............................ 1
• Air Hose (length as needed) ...................... 1
• Lifting Hook, Lifting Strap or Chain, Power
Lifting Equipment
(rated for 1000 lbs. or more) ...................... 1
Items Needed for
Setup
Your machine was carefully packaged for safe
transportation. Remove the packaging materials
from around your machine and inspect it. If you
discover the machine is damaged, please imme-
diately call Customer Service at (570) 546-9663
for advice.
Save the containers and all packing materials for
possible inspection by the carrier or its agent.
Otherwise, filing a freight claim can be difficult.
When you are completely satisfied with the condi-
tion of your shipment, inventory the contents.
Unpacking
This machine and its com-
ponents are very heavy.
Get lifting help or use
power lifting equipment
such as a fork lift to move
heavy items.
Wear safety glasses or
a face shield during the
entire setup process!
Model G0643 21-Bit Line Boring Machine -11-
Inventory
The following is a description of the main compo-
nents shipped with your machine. Lay the compo-
nents out to inventory them.
Note: If you can't find an item on this list, check
the mounting location on the machine or examine
the packaging materials carefully. Occasionally
we pre-install certain components for shipping
purposes.
Inventory: (Figure 4) Qty
A. Boring Machine (not shown) ...................... 1
B. Longitudinal Fence Assembly
(not shown) ................................................. 1
C. Hex Wrench Set
1.5, 2, 2.5, 3, 4, 5, 6, 8, & 10mm .......1 Each
D. Combo Open-End Wrenches
8/10mm, 12/14mm, 17/19mm ............1 Each
E. Hex Wrenches 2.5mm ................................ 2
F. Table ........................................................... 1
G. Hardware Bag (not shown) ......................... 1
— Flat Hd Cap Screws M6-1 x 35 .............. 4
— Hex Nuts M6-1 ....................................... 4
— Flat Washers 6mm ................................ 4
— Set Screws M5.8 x 5 ............................ 42
If any nonproprietary parts are missing (e.g. a
nut or a washer), we will gladly replace them; or
for the sake of expediency, replacements can be
obtained at your local hardware store.
Figure 4. G0643 inventory.
CDE
F
The unpainted surfaces are coated with a waxy
oil to prevent corrosion during shipment. Remove
this protective coating with a solvent cleaner or
citrus-based degreaser such as Grizzly’s G7895
Citrus Degreaser. To clean thoroughly, some parts
must be removed. For optimum performance
from your machine, clean all moving parts or
sliding contact surfaces. Avoid chlorine-based
solvents, such as acetone or brake parts cleaner
that may damage painted surfaces. Always follow
the manufacturer’s instructions when using any
type of cleaning product.
Clean Up
Gasoline and petroleum
products have low flash
points and can explode
or cause fire if used to
clean machinery. DO
NOT use these products
to clean the machinery.
Many cleaning solvents
are toxic if inhaled.
Minimize your risk by only
using these products in a
well ventilated area.
Figure 5. Grizzly citrus degreaser.
G7895—Grizzly Citrus Degreaser
This natural, citrus-based degreaser is a great
solution for removing export grease, and it’s much
safer to work around than nasty solvents.
-12- Model G0643 21-Bit Line Boring Machine
Floor Load
Refer to the Machine Data Sheet on Page 3 for
the weight and footprint specifications of your
machine. Some residential floors may require
additional reinforcement to support both the
machine and operator.
Placement Location
Consider existing and anticipated needs, size of
material to be processed through each machine,
and space for auxiliary stands, work tables or
other machinery when establishing a location for
your new machine. See Figure 6 for the minimum
working clearances.
Children and visitors may be
seriously injured if unsuper-
vised around this machine.
Lock entrances to the shop
or disable start switch or
power connection to prevent
unsupervised use.
Site Considerations
Figure 6. Minimum working clearances.
site considerations
Although not required, we recommend that you
mount your new machine to the floor. Because
this is an optional step and floor materials may
vary, floor mounting hardware is not included.
Generally, you can either bolt your machine to
the floor or mount it on machine mounts. Both
options are described below. Whichever option
you choose, it is necessary to level your machine
with a precision level.
Bolting to Concrete Floors
Lag shield anchors with lag bolts and anchor
studs (Figure 7) are two popular methods for
anchoring an object to a concrete floor. We sug-
gest you research the many options and methods
for mounting your machine and choose the best
that fits your specific application.
Mounting to Shop
Floor
NOTICE
Anchor studs are stronger and more perma-
nent alternatives to lag bolts; however, they
will stick out of the floor, which may cause
a tripping hazard if you decide to move your
machine.
Figure 7. Typical fasteners for mounting to
concrete floors.
Anchor Stud
Lag Shield & Bolt
mounting to floor
Model G0643 21-Bit Line Boring Machine -13-
Moving & Placing
Base Unit
The Model G0643 is a
heavy machine. Serious
personal injury may occur
if safe moving methods
are not used. To be safe,
get assistance and use
power equipment rated
for 1000 lbs. to move
the shipping crate and
remove the machine from
the crate.
To move your boring machine:
1. Prepare the permanent location for the boring
machine. Refer to CIRCUIT REQUIREMENTS
on Page 8 and Site Considerations on Page
12 for requirements.
2. Attach a safety hook and lifting strap or chain
to the eye bolt on the top of the machine,
then to the power lifting equipment (see
Figure 9).
Figure 9. Boring machine attached to lifting
equipment.
Figure 8. Machine mount example.
Using Machine Mounts
Using machine mounts, shown in Figure 8, gives
the advantage of fast leveling and vibration reduc-
tion. The large size of the foot pads distributes
the weight of the machine to reduce strain on the
floor.
NOTICE
We strongly recommend securing your
machine to the floor if it is hardwired to the
power source. Consult with your electrician
to ensure compliance with local codes. 3. Unbolt the machine from the shipping crate.
4. With assistance and the use of the power lift-
ing equipment, move the boring machine to
the prepared location.
5. Make sure the top of the cabinet is level and
mount the machine to the floor.
— If you are using permanent fasteners, use
shims between the base and the floor to
make sure the machine is level.
Note: To avoid cracking or warping the
cast iron base, tighten the four corners
down evenly.
— If you are using machine feet, adjust these
until the machine is level.
-14- Model G0643 21-Bit Line Boring Machine
Assembly
After mounting the boring machine to your shop
floor and providing the correct electrical connec-
tion, assemble the additional components.
To assemble your machine:
1. Slide the longitudinal fence assembly under
the headstock as shown in Figure 10.
Serious personal injury could occur if you
connect the machine to power before com-
pleting the setup process. DO NOT connect
the machine to the power until instructed
later in this manual.
Note: Make sure the locking assembly of the
longitudinal fence is facing the rear of the
machine, as shown in Figure 10.
Figure 10. Longitudinal fence positioned for
mounting to machine.
Fence Assembly
Locking Assembly
2. Thread the locking lever of the longitudinal
fence into the hex nut that is located in the
cross fence slot (see Figure 11).
3. Move the longitudinal fence up against the
headstock column, and tighten both locking
levers to hold it in place.
4. Position the table over the mounting flang-
es of the longitudinal fence, as shown in
Figure 12.
5. Secure the table to the longitudinal fence with
the four M6-1 x 35 flat head cap screws, flat
washers, and hex nuts.
Figure 11. Longitudinal and cross fence
attachment components.
Hex Nut
Locking
Lever
Locking
Block
Figure 12. Table mounted to longitudinal fence.
Cap Screws
Mounting
Flange
Model G0643 21-Bit Line Boring Machine -15-
6. Clean any debris off the shafts of the indexing
pins, apply a thin film of light machine oil to
the entire length, and slide the compression
spring onto the indexing pin shaft.
7. Slide the indexing pins into the holes at
the ends of the boring head, as shown in
Figure 13.
8. Remove the fill plug on top of the air lubrica-
tor unit (see Figure 14), and fill the oil reser-
voir with standard pneumatic tool oil.
9. Attach the air compressor hose to the air inlet
connection, and turn the air compressor on.
Note: The air compressor must provide at
least 70 PSI of air pressure.
10. Adjust the air pressure on the air regulator by
pulling up on the regulator adjustment knob
(see Figure 15), and turning it so that the air
pressure gauge reads 70 PSI.
Figure 15. Air regulator unit.
Adjustment
Knob
Air Pressure
Gauge
Air Inlet
Connection
11. Push the black adjustment knob down to lock
the air pressure at that setting.
12. Clear away all tools and materials used for
setup and assembly, then proceed to the
Test Run on the next page.
Note: Make sure the lubricator flow adjust-
ment knob is open at least one full turn.
Figure 13. Indexing pin mounted in the boring
head.
Boring Head
Indexing Pin
Figure 14. Air lubricator unit.
Fill Plug
Flow
Adjustment
Knob
Oil
Reservoir
-16- Model G0643 21-Bit Line Boring Machine
Test Run
Once the setup and assembly are complete, test
run your machine to make sure it runs properly.
If, during the test run, you cannot easily locate
the source of an unusual noise or vibration, stop
using the machine immediately, then review the
Troubleshooting on Page 26.
If you still cannot remedy a problem, contact our
Tech Support at (570) 546-9663 for assistance.
To test run the machine:
1. Read and follow the safety instructions at the
beginning of the manual, and make sure the
machine is setup properly.
2. Make sure all tools and objects used during
set up are cleared away from the machine.
3. If there are boring bits installed in the machine,
remove them.
4. Make sure the boring head guards are in
place and are free to move up as the boring
head comes down.
5. Make sure the air pressure dial on the air
regulator reads 70 PSI.
6. Ensure the machine is lubricated (refer to
Lubrication on Page 23).
7. Set the depth control to 0.50" (refer to
Adjusting Drilling Depth on Page 19 for
detailing instructions).
8. Connect the machine to the power source.
9. Push the Emergency Stop button in, then
twist it clockwise so it pops out. When this
button pops out, the switch is reset and ready
for operation (see Figure 16).
10. Turn the machine ON by pushing the power
button in—the green lamp on that button
should light.
11. Press down on the foot switch—the bor-
ing head should come down and the boring
chucks should begin to turn.
12. Listen to and watch for abnormal noises or
actions. The machine should run smoothly
with little or no vibration or rubbing noises.
— Strange or unusual noises should be inves-
tigated and corrected before operating the
machine further. Always disconnect the
machine from power when investigating or
correcting potential problems.
13. Lift your foot from the foot switch, and turn
the machine OFF by pressing the Emergency
Stop button in.
14. With the power to the machine turned OFF,
press the foot switch—the boring head should
come down but the boring chucks should
NOT turn.
15. If there were no problems during this Test
Run, the boring machine is ready for opera-
tion.
Figure 16. Resetting the switch.
Model G0643 21-Bit Line Boring Machine -17-
SECTION 4: OPERATIONS
Loose hair and cloth-
ing could get caught in
machinery and cause seri-
ous personal injury. Keep
loose clothing and long
hair away from moving
machinery.
NOTICE
If you have never used this type of machine
or equipment before, WE STRONGLY
RECOMMEND that you read books, trade
magazines, or get formal training before
beginning any projects. Regardless of the
content in this section, Grizzly Industrial
will not be held liable for accidents caused
by lack of training.
Operation Safety
Damage to your eyes and lungs could result
from using this machine without proper pro-
tective gear. Always wear safety glasses or a
face shield, and a respirator when operating
this machine.
Installing Boring Bits
The Model G0643 boring machine accepts boring
bits with the following specifications:
Total Quantity .................................................. 21
Total Left Rotating ........................................... 10
Total Right Rotating ......................................... 11
Shank Diameter ......................................... 10mm
Standard boring bits have a flat surface on the
shank (see Figure 17), and an adjusting screw
inside for height alignment.
To install boring bits:
1. DISCONNECT THE BORING MACHINE
FROM POWER!
2. Unscrew the two knurled knobs and remove
the front see-through guard from the boring
head.
Figure 17. Standard boring bit.
Adjusting Screw
Flat on Shank
-18- Model G0643 21-Bit Line Boring Machine
Note: Make sure the design of the boring bit
to be installed matches the rotation direction
of the chuck as shown by the information
circle on the boring head above the chuck.
For example, in Figure 18, the left most
chuck will rotate to the right, as viewed from
above the chuck. This is shown by the letter
"R" in the information circle. The boring bit
will also be 320mm on center from the middle
or number "0" boring bit, as shown by the
number in the top of the information circle.
Figure 18. Boring chuck information circle on
boring head.
Information Circle
Boring bits are sharp and can cut your
hands. Protect yourself by using a shop rag
to handle the bits for removal or installa-
tion.
4. Use a 2.5mm hex wrench to firmly tighten
two M5-.8 x 5 set screws into the chuck (see
Figure 19) and against the flat shank of the
boring bit.
5. Repeat Steps 3–4 for any other bits to be
installed.
6. Replace the front boring head guard.
Adjusting Downfeed
Speed
3. Align the flat shank of the bit with the chuck
and insert the bit completely into the chuck.
Note: Generally, slight differences of drilling
depth from one bit to another is acceptable.
However, if the drilling depth across all boring
bits is required to be precise for your opera-
tion, see Aligning Boring Bit Height on
Page 30.
The speed that the boring head lowers can be
adjusted by turning the downfeed speed adjust-
ment knob (see Figure 20). Experiment with dif-
ferent settings to determine the correct speed for
your operation.
Figure 20. Downfeed speed adjustment knob.
Figure 19. Boring bit installed.
Chuck Set
Screws
Flat Shank
Boring Bit
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