MODEL T1227/T1228/T1229
MAGNETIC CHUCK
INSTRUCTIONS
For questions or help with this product contact Tech Support at (570) 546-9663 or techsupport@grizzly.com
Introduction
The T1227-29 Magnetic Chucks are designed to
safely secure flat ferrous metal workpieces to the
work table for grinding operations. The ON/OFF
function of this chuck allows for easy adjustment
of a workpiece.
Inventory
Description Qty
A. Magnetic Chuck .......................................... 1
B. Hex Wrench 8mm ....................................... 1
C. Step Clamp Hold-Down Assemblies .......... 2
—T-Slot Bolts M12-1.75 x 70....................... 2
—Hex Nuts M12-1.75 .................................. 2
—Flat Washers 12mm ................................ 2
Magnetic chucks are heavy! Get assistance
if needed when installing or removing the
magnetic chuck from the surface grinder.
Wear heavy-duty leather boots for foot and
toe protection, and keep hands and fingers
away from all pinch points. Ignoring this
warning can lead to crushing injuries.
A
B
C
Figure 1. Models T1227-29 inventory.
NOTICE
If you cannot find an item on this list, carefully check around/inside the machine and
packaging materials. Often, these items get
lost in packaging materials while unpacking or they are pre-installed at the factory.
Magnetic Chuck Safety
1. STRONG MAGNETIC FIELD: A magnetic
chuck generates a powerful magnetic field.
Keep all objects sensitive to magnetic fields
(watches, cellular phones, magnetic cards,
etc.) away from the magnetic chuck to prevent damaging them.
2. PINCHING/CRUSHING INJURY: A magnetic
chuck generates significant clamping power.
When a magnetic object is moved near a
chuck that is turned ON, it will be attracted.
Any body parts caught between the object
and chuck will be pinched or crushed by the
magnetic force. Turn magnetic chuck OFF
any time it is not in operation.
3. WORKPIECE EJECTION: The workpiece
could be ejected during operation, causing it
to hit the operator with deadly force. Never
stand directly behind the workpiece (in the
direction of spark travel).
COPYRIGHT © OCTOBER, 2017 BY GRIZZLY INDUSTRIAL, INC.
NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
(FOR MODELS MFD. SINCE 9/17) #JH19252 PRINTED IN CHINA
V1.10.17
4. MAGNETIC FORCE VARIATION: Clamping
force generated varies greatly depending on
the material, thickness, flatness, and cleanliness of the workpiece. A workpiece that does
not clamp securely may be ejected from
the chuck during use and thrown into the
operator or bystanders. ALWAYS check for
adequate clamping force before beginning an
operation.
Grinder Preparation
Before placing your magnetic chuck onto your
surface grinder table, you must ensure that your
grinder table is flat. Variations in table flatness can
occur as a result of shipping and storage, manufacturer's production tolerances, overheating during use, previously mounted magnetic chucks, or
for various other reasons.
5. SUDDEN WORKPIECE MOVEMENT: When
the magnetic force is released, workpieces
may shift or fall unexpectedly and could result
in crushing injuries or personal injury. Fully
support any clamped workpieces before turning the magnetic chuck OFF.
6. PROPER MOUNTING: If magnetic chuck
shifts during use, chuck and workpiece could
be ejected from machine and thrown into
operator or bystanders, resulting in impact
or crushing injuries. Make sure the magnetic
chuck is properly secured to grinding table
before operation.
7. CHUCK STOPS: If the workpiece is not resting against the stops during operations, it may
shift and could be ejected from the machine
and thrown into the operator or bystanders,
resulting in impact or crushing injuries. Make
sure the workpiece rests against the rear and
side stops during operation. If necessary, use
spacers between the stops and workpiece.
8. SURFACE GRINDER SAFETY: Failure to
follow surface grinder safety could result in
serious personal injury or even death. Follow
all safety guidelines provided by your surface
grinder manufacturer.
9. RELEASING CLAMPING FORCE: Turning
the magnetic chuck OFF during operation
will release the workpiece, which may cause
the workpiece to shift and be thrown into the
operator or bystanders. Never turn the chuck
selector OFF during grinding operation.
To prepare the grinder table for chuck mounting,
very lightly grind, or "dust", the entire table surface
to make sure it is perfectly flat.
Chuck Preparation
Before putting your new magnetic chuck to use,
there are a few steps you must take to ensure
optimal performance and accuracy from your
grinding operation.
Removing Surface Imperfections
If damage was done to the crate during shipping,
the bottom surface may have scratches or dings.
If any imperfections are detected, perform the following steps.
To remove surface imperfections:
1. Very carefully clean grinder table and top sur-
face of magnetic chuck to remove any foreign
material.
2. Use a polishing stone to remove any surface
imperfections on machine table and top surface of magnetic chuck. Rough table finish
may reduce holding power during the following steps.
3. Carefully place magnetic chuck upside-down
onto table surface.
4. Engage magnet by turning chuck selector to
the ON position to lock it to the table.
10. FERROUS METALS: This magnetic chuck
will only work on metals containing iron. Nonferrous metals will be ejected from grinder
during use and could be thrown into operator
or bystanders, resulting in impact or crushing
injuries. DO NOT expect the chuck to hold
aluminum or other non-ferrous metals.
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5. Use surface grinder to grind bottom surface
flat and remove any imperfections. Be careful
to remove only as much material as necessary, and DO NOT attempt to remove more
than 0.0001" per pass.
T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
Surface Flatness
The surfaces of your magnetic chuck were ground
flat during production. However, it's a good idea to
double-check that the chuck is still flat after shipping and handling.
To test for flatness:
5. After allowing magnetic chuck to sit over-
night, perform Steps 1–3 again. Repeat as
necessary until there is no longer any trace
of warping.
If, after several attempts, magnetic chuck is still
warped, you must correct warping by grinding.
1. Make sure magnetic chuck is turned OFF,
then carefully place it upside-down on a clean
work surface.
2. Use a precision straightedge to check for flatness along length, width, and diagonals, as
shown in Figure 2.
Straightedge
= Additional Straightedge Positions
Figure 2. Testing surface flatness.
3. Carefully flip magnetic chuck over, then per-
form the same check on top surface of chuck.
— If no space is detected between mag-
netic chuck surfaces and the straightedge, proceed to Removing Surface
Imperfections.
— If any space is detected between the bot-
tom surface and the straightedge at any
point, the chuck has warped slightly during
shipping. Perform Step 4 to correct
warpage.
4. Clean, then use a polishing stone on bottom
surface of chuck and table surface of your
surface grinder to remove any foreign material and surface imperfections. Then carefully place magnetic chuck right-side up onto
grinder table in the position you plan to mount
it. Allow it to sit overnight. During this time,
any warping will be corrected as the chuck
becomes matched to table.
If you attempt to correct for warping by grinding
away high points, you will create variations in
overall thickness of chuck across its length and
width. These variations must be corrected by
grinding portions of the other side of the chuck to
compensate.
For example, if your chuck bows upwards at
each end and you correct this by slightly grinding away the surface at each end, your chuck will
be left thicker in the middle. You will have to flip
the chuck, then grind away the middle portion to
restore flatness.
Matching Chuck to Table
To ensure that the top surface of your new chuck
stays equidistant from the grinding wheel during
table travel, you must grind the surface of your
magnetic chuck to match your table.
To match your chuck to your table:
1. Very carefully clean grinder table and bottom
surface of magnetic chuck. Place magnetic
chuck on table, positioning it as desired, then
clamp it with the included holddowns.
2. Grind entire surface of magnetic chuck, making sure chuck stays as cool as possible during this process to avoid damaging magnets
and keep it from warping. DO NOT attempt to
remove more than 0.0001 inch per pass.
Avoid overheating chuck during grinding.
Too much heat during grinding will bow
chuck, causing middle portion to be
ground more than ends. Once chuck cools
again, it will flatten, leaving center area
thinner than the edges. Excessive heat
will damage magnets and reduce holding
power. DO NOT attempt to remove more
than 0.0001" per pass.
T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
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Chuck Mounting
To reduce your risk of
serious injury, read this
entire manual BEFORE
Operations
Once magnetic chuck has been matched to your
work table, ensure it is properly mounted to the
surface grinder before each use.
To mount chuck to grinder table:
1. DISCONNECT MACHINE FROM POWER!
2. Very carefully clean grinder table and bottom
surface of magnetic chuck to remove any
foreign material.
3. Place magnetic chuck on grinder table and
position it as desired.
4. Use included holddown assemblies (or other
appropriate mounting hardware) to clamp
chuck to table, as shown in Figure 3.
Hex Nut
The purpose of the operation section is to familiarize you with the basic controls, terminology,
capabilities, and adjustments that are necessary
to use this tool.
To better understand the remaining parts of this
section, please take a moment to read this
overview.
using machine.
To complete a typical operation, the operator
does the following:
1. Examines workpiece to make sure it is suit-
able for grinding.
Holddown
T-Bolt
Table Slot
Figure 3. Example of clamping magnetic chuck
to table.
2. Ensures magnetic chuck is mounted securely
to surface grinder table.
3. Thoroughly cleans top surface of magnetic
chuck and bottom of workpiece(s) to ensure
positive mating between the two.
4. Places workpiece(s) on chuck.
5. Adjusts work stops and adds spacers as
necessary to prevent workpiece(s) from sliding during operation.
6. Engages magnetic chuck by turning ON/OFF
selector to ON.
7. Checks that chuck has secured workpiece(s).
8. Proceeds with grinding operation.
9. Upon completion of grinding, allows grinding
wheel to come to a stop, then disengages
magnetic chuck and removes workpiece.
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T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
Clamping Workpiece
Hex Bolts
Hex Bolts (2 of 4)
Stops
Workpiece
Hex Bolts
Hex Bolts (2 of 4)
Stops
Workpiece
Workpiece
Spacer
Work Stop
Before any operation can be safely performed,
the workpiece must be properly positioned and
clamped on the chuck. While the magnetic field
is effective at keeping the workpiece from lifting
off the table during use, it may not be sufficient
to keep the workpiece from sliding. To keep the
workpiece from sliding, use the work stop.
To use work stops:
1. DISCONNECT MACHINE FROM POWER!
2. Turn ON/OFF selector to OFF.
3. Loosen cap screws securing work stops, lift
work stop high enough so it is above surface
of magnetic chuck, but below workpiece surface, as shown in Figure 4, then re-tighten
cap screws.
5. Place a spacer strip of steel bar (it must
be thinner than workpiece) as necessary
between workpiece and work stop to provide
bracing against slippage.
Note: Spacer strip also aids in proper work-
piece alignments to magnetic chuck and
grinder.
6. Make sure workpiece is snug against spacer
strip and spacer is snug against stop, then
turn ON/OFF selector to ON position, as
shown in Figure 5, to engage magnet.
Workpiece & Spacers
Snug Against Stops
4. Position workpiece so it is near center of
chuck, as shown in Figure 4.
Workpiece
Work Stop
Figure 4. Positioning work stop and spacer.
Non-striped areas at the ends of the chuck
DO NOT produce a significant magnetic field
and WILL NOT securely clamp workpiece.
Placing a workpiece in these areas could
result in workpiece being ejected from chuck
and thrown into operator or bystanders
during use!
Spacer
Turn to
ON Position
Figure 5. Positioning work stop and spacer.
7. Make sure workpiece is secured by pulling
upward on it with moderate to strong force. If
it releases, turn magnetic chuck OFF, make
sure mating surfaces are clean, then repeat
Step 6.
— If you are unable to secure workpiece with
magnetic chuck, you will need to use an
alternative mounting method.
T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
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Using Auxiliary Magnetic Blocks
If your workpiece cannot be placed flat on the
chuck due to warping, an irregular shape, or any
other reason, you must use auxiliary magnetic
blocks to support the workpiece. To ensure that
the workpiece is held parallel to the chuck, you
may need to grind the auxiliary magnetic blocks
before placing your workpiece in them.
Figure 6 shows an example of how magnetic
V-blocks can be used to mount a workpiece with
an irregular bottom surface.
Workpiece
Auxiliary
Magnetic Blocks
Figure 6. Using auxiliary blocks.
Only use magnetic blocks on this chuck
to hold irregular workpieces. Using nonmagnetic auxiliary blocks will not provide
sufficient clamping force and may result in
workpiece being thrown from grinder and
into operator or bystanders during use.
3. Clean away any metal chips or swarf from
around workpiece and magnetic chuck with
a stiff-bristled brush and remove workpiece
from chuck.
Note: Workpiece may seem stuck to chuck
due to residual magnetism in workpiece or
a vacuum between workpiece and chuck.
If this is the case, a blast of air from an air
nozzle can be used to release the vacuum.
Alternately, you can slide the workpiece off
the side of the chuck to remove it. Using this
method, however, may result in scratches to
the chuck surface.
Care & Maintenance
For optimal performance from your magnetic
chuck, follow the maintenance schedule below.
Daily:
• Check/correct loose clamping bolts.
• Use a vacuum, rag, or brush to clean the
chuck after use. Never use air pressure to
clean metal chips/swarf away from a chuck.
• Apply rust preventative to magnetic chuck
after each use to prevent rust.
• Avoid leaving a workpiece on the magnetic
chuck when not in use.
• Inspect for damage to the surface of magnetic chuck that may compromise its flatness.
Regrind as necessary.
• Stone chuck surface before use.
Monthly:
• Grind top of magnetic chuck to reduce effects
of warping.
Removing Workpiece
After the grinding operation, remove your workpiece from the magnetic chuck.
To remove a workpiece from chuck:
1. DISCONNECT MACHINE FROM POWER!
2. Turn ON/OFF selector to OFF position.
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Semi-annually/Annually:
• Remove chuck, re-grind table, re-install
chuck, then re-grind chuck surface.
If you plan to place your surface grinder
into storage, remove magnetic chuck from
table. Metal objects left on grinder table
over extended periods will rust and cause
permanent damage to magnetic chuck and
grinder table. Store magnetic chuck on a
flat surface to minimize warping.
T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
Troubleshooting
Symptom Possible Cause Possible Solution
Magnetic chuck
does not attract
the workpiece.
Holding power
is weak.
Workpiece
cannot be
removed from
chuck.
1. Magnetic field selector not engaged.
2. Workpiece is a non-ferrous material.
3. Selector mechanism faulty.
1. ON/OFF selector is not fully turned to ON
position.
2. Chuck surface dirty.
3. Workpiece placed off-center.
4. Workpiece mating surface irregular/has
contaminants.
5. Workpiece material not strongly attracted to
magnets.
1. ON/OFF selector is not fully turned to OFF
position.
2. Vacuum lock between chuck and workpiece;
residual magnetism between workpiece and
chuck.
1. Turn ON/OFF selector to ON position.
2. Use only materials that are attracted to magnets; use
alternative clamping methods.
3. Inspect/replace magnetic chuck.
1. Make sure ON/OFF selector is turned all the way to
ON.
2. Clean chuck surface.
3. Keep workpiece centered in chuck.
4. Use holding blocks; clean mating surface before
placing on chuck.
5. Use only materials that are attracted to magnets; use
alternative clamping methods.
1. Make sure ON/OFF selector is turned all the way OFF.
2. Slide workpiece off side of chuck.
Parts Breakdown & List
1
PERMANENT
MAGNETIC CHUCK
Model:
Serial No:
10
11
9
12
OFF
ON
8
We do our best to stock replacement parts
when possible, but we cannot guarantee that
all parts shown are available for purchase.
Call (800) 523-4777 or visit www.grizzly.
com/parts to check for availability.
13
2
4
3
5
6
7
REF PART # DESCRIPTION
1 T1227001
1 T1228001
1 T1229001
2 T1227002
2 T1228002
2 T1229002
3 T1227003
4 T1227004
5 T1227005
6 T1227006
7 T1227007
8 T1227008
9 T1227009
10 T1227010
11 T1227011
12 T1227012
13 T1227013
PARTS STORE
MAGNETIC CHUCK ASSEMBLY (T1227)
MAGNETIC CHUCK ASSEMBLY (T1228)
MAGNETIC CHUCK ASSEMBLY (T1229)
WORK STOP (T1227)
WORK STOP (T1228)
WORK STOP (T1227)
CAP SCREW M6-1 X 12
FLAT WASHER 6MM
HEX NUT M12-1.75
FLAT WASHER 12MM
T-SLOT BOLT M12-1.75 X 70
HOLDDOWN
ON/OFF NAMEPLATE
RIVET 3 X 10MM NAMEPLATE, STEEL
TOOL NAMEPLATE
HEX WRENCH 10MM, LONG SHAFT
CAP SCREW M6-1 X 25
BUY PARTS ONLINE!
Scan QR code with your
digital device or visit
www.grizzly.com/parts
to purchase replacement
parts or check pricing and
availability.
T1227/28/29 Magnetic Chuck (Mfd. Since 09/17)
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