microjig GRR-RIPPER Operating and maintenance manual

Watch the GRR-RIPPER Quickstart Video, visit microjig.com/worksafer
3D PUSHBLOCK
For use on table saws, bandsaws,
router tables, jointers, and more
GR-200
GR-100
GR-100 & GR-200
INSTRUCTIONAL MANUAL v7.0
Read the Important Safety
Disclaimers in this manual prior
to use. Keep manual for future reference.

GRR-RIPPER PARTS (Indicated by Red Circles ) GR-100 GR-200
Handle 1 1
2 Main Body 1 1
Center Leg 1 1
1/2” Side Leg 1 1
1/4” Side Leg 1 1
Balance Support 1 1
Stabilizing Plate 1
Adjustable Spacer 1
HARDWARE (Indicated by Blue Circles ) Red Bag Blue Bag
A #10 x 7/16” OD Washer 8 8 2
B 1/4 x 1/2” OD Washer 2 2
C 9/32” OD O-Ring (#10 screw) Black 6 6 2
D 5/16” OD O-Ring (1/4-20 screw) Orange 2
E 10-32 x 1/2” Green Thumb Screw 2 2 2
F 10-32 Green Round Knob 2 2
G 1/4-20 Oval Nut 2 2
H 10-32 x 1” Green Dovetail T-Bolt 2 2
K 1/4-20 x 3/4” Pan Head Screw 2 2
L 10-32 x 1/2” Pan Head Screw 4 4
M 1/4-20 x 1 3/4” T-Bolt 2
N 1/4-20 Yellow Wing Knob 2
P Nylon Shoulder Washer 2
GR-100 GR-200
NOTE: Please check to ensure that you have
all parts and hardware before assembling.
If you have purchased the GRR-RIPPER Upgrade Kit
(GRAK-404) please reference Step 6 on Page 10 for
installation instructions.
7
2
8
4
3
5
6
1
Figure 4
A
1
A
1
4
2
5
7
3
6
8
C
B
D
E2
F2
G
H2
K
L
M
N2
P

TABLE OF CONTENTS
Introduction ................................................4-5
Operation Precautions & Safety ................................6-8
Assembly .................................................9-11
How to Use...............................................12-13
Using the 1/4” and 1/2” Legs ...................................14
Irregularly Shaped Stock .......................................15
Balance Support Spacer .......................................15
Resawing....................................................16
Grooving a Round Dowel ......................................16
Bevel Cuts...................................................17
Pattern Routing ..............................................17
Slotting .....................................................17
Control and Feed Long Stock ...................................17
GRR-RIPPER Accessories ....................................18-19
3

INTRODUCTION
4
Congratulations on purchasing the GRR-RIPPER 3D Pushblock system. Over 5,000 hours
of engineering, 45 design concepts and prototypes went into making the GRR-RIPPER
the safest, most precise pushblock available. Before using your GRR-RIPPER, read
through this manual to familiarize yourself with the GRR-RIPPER and how it works.
The following is a general overview of the way the
GRR-RIPPER is designed to work:
The GRR-RIPPER uses grooved non-slip
pads (Green GRR-RIP®) to hold down and
feed your workpiece through the cutting
element. The tool can be rotated end-
to-end to for use with either the 1/2” or
1/4” Side Leg against the fence.
With the rip fence set parallel to the saw
blade, the GRR-RIPPER glides against
the rip fence to ensure a parallel feed. It
also keeps both sides of the workpiece
in their original positions throughout the
cutting process, which virtually prevents
the possibility of kickback and burning.
With bare-hand feeding eliminated,
nger injury is greatly reduced.
The GRR-RIPPER feeds the workpiece
as the saw blade passes through either
its right or left tunnel. This feature
virtually eliminates the need for bare-
hand feeding when used properly.
The GRR-RIPPER is a protective guard
that you hold throughout the
cutting operation.
GRR-RIPPER
glides against
rip fence
Green GRR-RIP®
Reversible
Figure 1
Figure 2

BC
F
D
E
A
Figure 3
WARRANTY REGISTRATION
Each MICROJIG product includes a three year manufacturer’s warranty. Please
mail in the provided registration card or complete the registration online at
microjig.com/support/warranty-registration
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INTRODUCTION
5
A
B
C
D
E
F
The Adjustable Handle can be relocated directly above the cut-line, providing
balanced and concentrated pressure.
The height-adjustable Balance Support
accommodates different thicknesses
of stock.
The adjustable Center Leg precisely
supports different widths of cuts, providing
complete control of both sides of stock.
Wooden riser spacers can be added for
use with stock thicker than 2”.
Attach with #8 pan head wood screws
and washers (not included).
A wooden spacer can also be added between the GRR-RIPPER and the fence to
increase the cutting width capacity of the GRR-RIPPER.
Fully adjustable GRR-RIPPER controls wood of different widths and thicknesses.
Fully adjustable for your project needs.

OPERATION PRECAUTIONS & SAFETY
6
SAFETY WARNING! Operation of the GRR-RIPPER 3D Pushblock system
includes the use of a table saw or other tools that are not part of the GRR-RIPPER.
Micro Jig, Inc. assumes no liability for any product not sold and manufactured by Micro
Jig, Inc. You must take all necessary precautions when operating a table saw or other
tools as recommended by their manufacturers or as required by any prudent tool user.
You must also read and agree to the safety precautions and terms listed below before
using the GRR-RIPPER 3D Pushblock system. Your assembly of the GRR-RIPPER 3D
Pushblock system indicates your agreement to follow these safety precautions and
terms when using this tool.
The following operation precautions of using the GRR-Ripper on table saw
are based on the rip fence is installed to the right of saw blade.
The GRR-RIPPER 3D Pushblock System
includes three legs with non-slip pads.
A minimum of two legs MUST be
installed during any cutting operation.
Use at least one leg to the right and
one leg to the left of the saw blade
whenever possible.
Before every cut, you must look
through from the end of the tool after
it is in an operational position to make
sure the cutter will go through the
tunnel between the legs throughout the
cutting operation without touching any
component of the tool or other objects
except the workpiece.
The bottom of the workpiece must be
at enough so that it does not rock on
the table top. The top of the workpiece
must be at enough so all non-slip
surfaces are in full contact with the top
surface of the workpiece.
In table saw operation, the face of the
Side Leg on the right must be in full
contact with the rip fence at all times
in order to create a parallel guide for
forward feeding and inward pressure
against the rip fence.
The saw blade must not be set more
than 3/4” higher than the top surface
of a at workpiece. The ideal height is
when the top gullet is slightly above the
top surface of the workpiece.
BEFORE USE

OPERATION PRECAUTIONS & SAFETY
7
In table saw operations, the rip fence
must be securely locked parallel to
the saw blade within the usable range
of the GRR-RIPPER 3D Pushblock
system.
When using this tool in conjunction with
any other tool, rst read and follow all
instructions and safety information in
the owner’s manual for that tool.
Always wear safety glasses and hearing
protection. Follow all normal shop
safety practices.
It is the sole responsibility of the
purchaser of this product to ensure that
any third party reads and agrees to all
safety precautions and terms prior to
their use of this tool.
In table saw operations, the GRR-
RIPPER 3D Pushblock system must be
used so it is in full contact with the rip
fence at all times, and the saw blade
MUST pass through and without cutting
into any part of the GRR-RIPPER.
Use maximum possible coverage of the
non-slip pads on the workpiece.
The GRR-RIPPER 3D Pushblock system
must be used in an absolute stable
condition. When a workpiece is narrow
and is not covered by the leg on the
left (away from fence), the Balance
Support must be secured to the left leg
so the bottom surface of the Balance
Support is in full contact with the table
top to secure the steadiness of the tool
during the entire cutting operation.
The non-slip pads placed on the top
surface of the workpiece must be in
full contact with the workpiece.
Frequently inspect the effectiveness
of the non-slip pads. Remove built-up
dust as necessary with denatured or
91% rubbing alcohol.
When using only one GRR-RIPPER, we
suggest both hands on the tool; one
gripping the handle, and the other
placed on top of the main body.
Use the Balance Support, Adjustable
Spacer and Stabilizing Plate as
appropriate to help support and control
small or irregularly shaped parts. See
Figure 16. If the GRR-RIPPER does not
appear stable, or you are not condent
in making the cut, do not proceed.
Use saw blades that are designed for
the intended cutting operation.
PROPER USE

OPERATION PRECAUTIONS & SAFETY
8
All components must be inspected for
damage and securely fastened before
every use. Stop using the tool if any
damage occurs.
Do not use this product while under
the inuence of drugs, alcohol or any
medication.
To clean this product, use denatured
alcohol (available in the paint
department of home improvement
centers) or 91% rubbing alcohol
(available at drug stores).
Do not use this tool if any of the
components are damaged. Contact
your dealer or the manufacturer for
replacement parts.
When not in use, store this product on a
at and clean surface.
The machine tabletop used in
conjunction with this tool must be
at and free from obstructions other
than the required fence and one
cutting element. The tabletop must
be reasonably level and below the
waistline.
You must have a sturdy and straight rip
fence with a at front surface preferably
at least 3” in height and square to the
table saw top. The rip fence must be
long enough to cover the entire depth
from the front to the rear of your table
saw top. The rip fence must also be
equipped with a locking mechanism to
secure it on the table saw top so that it
is parallel to the saw blade at all scale
settings. WARNING! DO NOT SKEW
THE RIP FENCE! The GRR-RIPPER is
designed to feed wood parallel to the
saw blade.
The rip fence should also be accurately
calibrated to a xed scale to secure a
precise cutting width setting.
A sharp and clean carbide-tipped saw
blade should be used with this tool for
ripping, unless otherwise specied.
A Zero-Clearance Throat Plate or insert
(ZCI) should always be used when
cutting narrow strips. INFO: Watch our
online video on how to install a Zero-
Clearance Throat Plate: microjig.com/zci
WARNING! Never wear loose clothing,
gloves, bracelets or other jewelry that
may get caught in the moving parts or
cutting elements.
MAINTENANCE
TABLE SAW PREPARATION

Brass Inserts
Side Legs
54 &
ASSEMBLY
9
ASSEMBLY – GRR-RIPPER MODEL GR-100
Assembly video available online at microjig.com/gr-assembly
INFO: If you purchased a GRR-RIPPER Handle Bridge Kit (GRHB-010), please refer to its
instruction manual for installation rst, and then resume GRR-RIPPER assembly at Step 2.
1. Install both Side Legs (4) and (5) in
the same manner on opposite sides of
the Main Body (2). 2. Insert the screws
and washers through the front screw
holes, insert the O-Rings from the back
side. See Figure 8 for detail. INFO:
If you purchased the GR-200, do not
confuse the smaller Black (C) and larger
Orange O-Rings (D).
STEP 3 & 4
Handle
1
Main Body
2
3
2
1
Gx2
Assemble Handle (1) to the top slots of
Main Body (2).
STEP 1
Close-up view with
Handle and Center Leg
installed on Main Body
Close-up of O-Ring
embedded in
counter-bore
Figure 5 Figure 7
Figure 8
Figure 6A
1. Attach mounting hardware to Center
Leg (3). 2. Assemble Center Leg (3) to the
end slots of Main Body (2) (see Figure 6A).
STEP 2
x2
B
x2
K
Lx4
G
H2
x4
C
Main Body
2
3
Center Leg F2 x2
x2
H2
Figure 6
x2
A
x4
A

10
ASSEMBLY
STEP 5
Brass Inserts
Balance Support
6
1. Attach Thumb Screws (E2) to Balance
Support (6). 2. Assemble Balance
Support (6) to either Basic Model GR-100
completed Side Leg (4) or (5).
INFO: If you purchased the GRR-RIPPER
Advanced Model GR-200 or the Upgrade
Kit GRAK-404, please proceed to Step 6
on Page 11.
TIP: To keep the non-slip pads
working most effectively, clean the
contact surfaces with denatured
alcohol or 91% rubbing alcohol and a
shop rag prior to use. Repeat cleaning
during use as necessary when saw
dust accumulates. Do not use if Green
GRR-RIP is not effectively gripping the
workpiece. Please contact MICROJIG in
regards to product issues.
E2 x2
Ax2
Cx2
COMPLETED GR-100
Figure 9
Figure 10

11
STEP 6
ASSEMBLY – GRR-RIPPER ADVANCED
MODEL GR-200 (GR-100+GRAK-404)
Assembly video available online at
microjig.com/gr-assembly
With hardware installed, snap the Stabilizing
Plate (7) into the open slots of the Balance
Support (6). Do not tighten completely.
Attach to Balance Support (6) and tighten
when desired position is achieved. It is by
design that the open slots are narrower
than the Shoulder Washer (P), so that the
Stabilizing Plate (7) will remain in place during
adjustments. The Stabilizing Plate (7) can also
be used with its straight edge facing
the GRR-RIPPER. TIP: Push the Orange
O-Ring (D) through the T-Bolt (M) all the
way down, making contact with the
Stabilizing Plate (7) before inserting the
Shoulder Washer (P) and the Thumb Knob (N).
7
6
On top of slot
N2 x2
Px2
Orange
Dx2
Mx2
D
Reversible
The Adjustable Spacer (8) can be
attached to either side of the GRR-RIPPER
as needed. It can be used with the non-slip
pad downward to provide additional
gripping surface pressure. Lower it to
achieve two levels of pushing surfaces.
It can also perform as a “balancing device”
with the non-slip pad facing upward.
STEP 7
COMPLETED GR-200
8
Brass Insert
Adjustable
Spacer
Black
E2 x2
Figure 11
Figure 13
Figure 12
Cx2 Ax2
Reversible
ASSEMBLY
P

12
HOW TO USE
The GRR-RIPPER 3D Pushblock System
is designed to glide along the rip fence
of a table saw, therefore the rip fence
must be parallel to the saw blade in
order to maintain the parallel feed.
The saw blade should be raised just
enough in height to clear the gullets
from the top surface of wood pieces,
normally about 1/4” to 3/8”. Pay extra
attention on workpieces that are not
equal in thickness such as tapered
stock. The tunnel has a clearance of
15/16” in height.
The saw blade must pass through the
adjustable tunnel and between the
legs for maximum safety. Visually check
the Saw Blade Tunnel before turning
on your saw to make sure that the saw
blade will not cut into any component
of the GRR-RIPPER.
When using only one GRR-RIPPER, we
suggest both hands on the tool; one
gripping the handle, and the other
placed on top of the main body. Place
one hand in the inclined position and
grip the Handle (1). Place the other on
the top of the Main Body (2) to provide
added pressure against the rip fence,
additional forward feeding and rm
downward pressure on the workpiece.
WARNING! NEVER feed stock
using bare hands when using the
GRR-RIPPER.
For best cutting results, use one non-
stop feed from start to nish - do not
pause during the cutting operation.
Push the workpiece completely clear
of the saw blade, stop the motor,
and wait for the saw blade to come
to a complete stop before releasing
pressure from the workpiece.
Depending on your table saw model,
the GRR-RIPPER system should be
placed about 1“ to 4” from the trailing
end of the workpiece, otherwise, the
tool will be off the table saw top at the
rear before the workpiece will be clear
of the saw blade.
If workpiece is longer than 16”, the
use of two GRR-RIPPER systems is
recommended.
Use the “leap-frogging” technique for
cutting stock of unlimited length.
INFO: Watch the online video:
microjig.com/leapfrog
HOW TO USE THE GRR-RIPPER
GRR-RIPPER Quickstart Video available
online at microjig.com/worksafer

13
The Handle (1) can be secured at an
angle in relation to the Side Legs (see
Figure 17 on Page 15). Angling the
handle allows for individual ergonomic
comfort.
The non-slip pads are molded from a
thermal plastic that compresses slightly
when downward pressure is applied.
When setting the height of the Balance
Support (6), it is best to set the non-slip
pads over the workpiece, put normal
downward pressure from the Handle
(1), lower the Balance Support (6) until
it fully contacts the table saw top, then
secure the Balance Support (6) in that
position before releasing pressure from
the Handle (1). Double-check the setup
by applying downward pressure on the
tool with one hand and slightly pulling
the workpiece under the tool. If not
enough contact pressure in either the
front or rear, adjust the Balance Support
(6) accordingly.
If the width of the cut is between 1/4”
to 5/8” on the Inside Cut, use the 1/4”
Side Leg (5) on the right against the
rip fence. If the width of the cut is less
than 1/4”, it should be obtained from
Outside Cut as shown in Figure 15 on
Page 14. One advantage of using the
GRR-RIPPER for cutting thin strips over
the conventional push block method is
that the width of your prepared stock
on the Inside Cut area is substantially
reduced. Yield is greatly increased by
saving material, thus reducing costs.
Most importantly, the saw blade is
always within the tunnel, which provides
protection for your ngers.
For a wider Inside Cut that is beyond
the limits of the GRR-RIPPER system,
wooden spacers of an appropriate
width can be added to the Side Leg
against the fence (see Figure 3). Drill
a couple of counter bored holes (5”
center-to-center) for 10-32 pan head
screws and secure it to the brass inserts
on the Side Legs. Alternately, you can
use #8 pan head wood screws from the
inside wall of the 1/2” Side Leg (4).
ADJUSTING THE GRR-RIPPER
HOW TO USE

14
HOW TO USE
WARNING! Always visually check to ensure that the Saw Blade Tunnel has enough
clearance for the saw blade to pass through safely before turning on the saw.
Use the 1/2” Leg (4) against the
fence for cutting width (Inside Cut)
of 5/8” to 3 3/16”. Use the Balance
Support (6) when stock is not wide
enough to be under the Side Leg on
the left. The Handle (1) is secured
more towards the right side of
the saw blade since no pressure is
required on the left side of the cut.
Fig 15
Outside Cut Inside Cut
Balance
Support 1/2” Leg
4
6
1
Figure 15
USING THE 1/4” LEG USING THE 1/2” LEG
Fig 14
5
1
Outside Cut Inside Cut
Rip fence parallel
to the saw blade
Always keep the
GRR-RIPPER in full
contact against
the rip fence
1/4” Leg Saw Blade
Figure 14
Use the 1/4” Leg (5) against the fence for
cutting width (Inside Cut) of 1/4” to 5/8”.
Note the location of the Handle (1) above
the cut line in order to apply balanced
pressure to both sides of the stock.
GRR-RIPPER Quickstart Video available
online at microjig.com/worksafer

Fig 17
Balance
Support
6
8
1
15
INFO: All table saw illustrations in this instruction manual show a 1/8” kerf saw blade
and a rip fence that is secured parallel and to the right of the saw blade.
Inside Cut = Cut between rip fence and the saw blade, is usually the keeper piece.
Outside Cut = Cut on the left side of saw blade, is usually the off-cut piece.
HOW TO USE
Figure 17
Using the Balance Support (6) against
the fence will provide an additional
2” of cutting width. The Adjustable
Spacer (8) can be used on the left as a
balancing device.
Skew Handle (1) to exert “auto” pressure against
the fence when pushed.
BALANCE SUPPORT SPACER
Add a wooden spacer
for thicker stock - use #8 pan head
wood screws & washers (not included).
Adjustable
Spacer
INFO: This is a translucent bottom
view with the table saw top removed
for clarity. The GRR-RIPPER GR-200 is
feeding irregularly shaped stock to obtain
a straight edge. Notice the 1/2” Leg (5)
does not cover the stock edge completely.
The Adjustable Spacer (8) is used with
the smooth side down and leveled with
table top to prevent the tool from tipping
over and to glide against the rip fence for
a parallel feed. INFO: Watch the online
video: bit.ly/straight-line-ripping
Rip Fence
5
8
Irregularly Shaped Stock
Figure 16
IRREGULARLY SHAPED STOCK

Fig 18
Inside
Cut
1
Outside Cut
6
16
HOW TO USE
Resawing: You can resaw narrow stock in one pass without a bandsaw, planer
or flat-bed sander. CAUTION! Stock must be square before resawing.
Resawing stock thinner than 1/4”, or resawing wider
stock, can be achieved in two passes by setting the
saw blade slightly higher than one half of the width
of the stock in the rst pass. Flip the stock over and
nish with a second cut.
Suggestion: Resawing stock thinner than 1/4”
should be obtained from the outside cut.
A wooden spacer can be added to the Balance
Support (6) for stock wider than 2” (see Figure 3 on
Page 5). INFO: Watch the online video to see this
and many other techniques: microjig.com/worksafer
Resaw to 1/4” (Inside Cut) or thicker in one pass as shown in Figure 18.
Note Handle (1) location.
Figure 18
With one of the Side Legs removed, the
Center Leg (3) is registered against the
rip fence, and the Stabilizing Plate (7) of
a GR-200 holds the dowel against the rip
fence. You can also split a round dowel in
half. INFO: Watch the online video:
microjig.com/dowel
RESAWING
GROOVING A ROUND DOWEL
Fig 19
Center Leg (3) is secured
against rip fence when
feeding the dowel.
Dowel
3
Stabilizing Plate (7)
against the dowel.
Figure 19

Fig 23
Figure 23
Saw blade at 45 degrees
Figure 20
Fig 21
Template
Workpiece
Flush Trimming
Router Bit
6
Figure 21
17
When bevel cutting from 0 to 45 degrees,
the GRR-RIPPER provides great control and
virtually eliminates binding. INFO: Watch
the online video: microjig.com/bevelcut
Use the Stabilizing Plate (7) of the
GR-200 as a second fence to box-in the
workpiece on the router table.
For stock longer than 16”, please use
two GRR-RIPPERs in a “leap-frog”
operation to continuously feed the
workpiece. INFO: Watch the online
video: microjig.com/leapfrog
Securely holds and guides a small workpiece
against a template without tipping over. Use
Balance Support (6) to stabilize the GRR-RIPPER
when working with narrow or small material.
BEVEL CUTS SLOTTING
PATTERN ROUTING CONTROL & FEED LONG STOCK
Fig 22
Use as second fence
Figure 22
HOW TO USE

Fig on page 18 - Bonus Trailing Hook
Bonus Trailing
Hook included.
18
GRR-RIPPER ACCESSORIES
1/8” Leg
Part Number: GRP-11G
Handle Bridge Kit
Part Number: GRHB-010
Fits all GRR-RIPPER models. Rip 1/8” thin
strips safely, accurately, and consistently
on a table saw with the GRR-RIPPER 1/8”
Leg. SEE IT IN ACTION: Watch the online
video: microjig.com/thinleg
Fits all existing GRR-RIPPER models.
Unique arch design gives the handle four
points of contact to evenly distribute the
downward pressure. Allows you to angle the
handle for more ergonomic comfort.
GR100 with HB
Close up Fig on page 18

Fig on page 19
GRR-RIPPER ACCESSORIES
19
Gravity Heel Kit
Part Number: GRGH-040
Fits all GRR-RIPPER models. The Adjustable
Heel hooks onto the tail-end of your
workpiece and automatically retracts when
midboard. Reduces tearout on table saws
and router tables. Adjustable depth and
can lock into position.
SEE IT IN ACTION: Watch the online
video: microjig.com/gravityheel
Upgrade your GRR-RIPPER today.
Buy accessories and more at microjig.com/store

GRR-RIP BLOCK’s revolutionary
Gravity Heels grab the tail-end of the board
or automatically retract on the board. Easily locks
into place when not needed.
Podular Green GRR-RIP®
non-slip material
gives you command
over your work.
SMART
PUSHBLOCK
Harness the ultimate gripping power of the only
pushblock with smart Gravity Heel hooks that know
where to grab your workpiece. Safety’s never been
so smart. Work safer. Work smarter.
EXTREME GRIP GRR-RIP BLOCK’s cutting edge
technology increases safety and stability when working with
jointers, band saws, router tables, shapers and table saws.
VERSATILITY Use the 90-degree flip guide for veneers or
resawing on band saws. Or use GRR-RIP BLOCK against the
router fence for beaded face frames and other profiles. The
Gravity Heels still engage vertically for superior control.
PROTECTION Wield improved control over your workpiece
for free hand routing while keeping your hands clear and
safe. (GRR-RIP BLOCK shown here with the optional MJ
Deflector/Connector accessory.)
1
2
3
STRONGER GRIP,
SMARTER HEELS.
SEE IT IN ACTION: Watch the online
video: microjig.com/gb1