CRB7 - MHL
MORTISE, HINGE & LOCK JIG
Thank you for purchasing the M.POWER CRB7
Mortise, Hinge and Lock Jig (MHL Jig) we hope
you enjoy using it.
The CRB7 MHL should give lasting performance
if used in accordance with these instructions.
The following symbol is used throughout these
instructions.
Denotes risk of personal injury, loss of life
or damage to the tool in case of
non-observance of the instructions. Please refer
to the instruction manual provided with your
power tool.
SAFETY
Please read and understand the safety points at
the end of these instructions as well as the
power tool instructions before use.
Users must be competent in safe routing
practices before using this product.
CONTENTS
1. Intended Use
2. Functions
3. Items Required
4. Items Enclosed & Description Of Parts
5. Assembly
6. Setting Up
7. Operation
9. Maintenance
10. Environmental Protection
11. Guarantee
11. Safety Points
1. INTENDED USE
This accessory is a retro fit jig for use with the
CRB7 Combination Router Base. The MHL Jig is
intended to:
• Increase stability when cutting mortises
• Reduce the possibility of error.
• Increase precision during routing Mortises,
Hinge and Lock recesses.
• Increase the overall versatility of the CRB7
• Save set up time between tasks.
2. FUNCTIONS
• Micro Adjustable Centered and Off Centered
Mortising
• Adjustable Mortising for material between
1.½” > 7” (38 > 178mm).
• Adjustable Hinge and Lock rebates.
3. ITEMS REQUIRED
• Hand Tools – Posi drive – Philips
screwdriver.
• 3/16th (4.5mm) Drill bit, Counter sink bit,
Drill, Bradawl.
4. ITEMS ENCLOSED & DESCRIPTION OF
PARTS
1. Bridge - (SKU: 50013)
2. Fixing Screws x 4 - (SKU: 50027)
3. Bridge Pinch-bolts x 2 - (SKU: 50024)
4. Micro Adjuster - (SKU: 50024)
5. Jaw Guide Rods x 2 - (SKU: 50085)
5A. Jaw Adjuster Rod - (SKU: 50084)
6. Fixed Jaw - (SKU: 50063)
7. Adjuster Jaw - (SKU: 50063)
8. Fixed Cheek Screws x 4 - (Code: 50067)
5. ASSEMBLY
IMPORTANT:
If your CRB7 baseplate does not
already have the MHL Bridge fixing drillings you
will need to drill them using the
dimensions shown in Fig 2.
Using a screwdriver, remove the CRB7 bridge
from the CRB7 baseplate.
Mark the drilling locations on the baseplate.
Using a 3/16th (4.5mm) twist bit and suitable
drill - make 2 x through holes. Clean the edges
of the holes if needed. Then counter sink both
holes so that the screw heads sit flush or just
beneath baseplate surface.
IMPORTANT NOTE:
The retro fit position of the
MHL bridge drillings does NOT allow the MHL
jaws to line up with each other. – This does NOT
in any way effect the performance or function of
either the MHL or the CRB7.
CUTTING A MORTISE or HINGE REBATE or
LOCK REBATE
Mark out all of the rebates required in the usual
way. Check the work piece dimensions and set
up the MHL jaw and bridge accordingly
POSITION OF FIXED JAW AND BRIDGE
See Fig 3.a
For Stock width 0 > 1 1/2“ (0 > 36mm) use
Fixed Jaw position A - Bridge position A.
See Fig 3.b
For Stock width 1 1/4” > 4 1/2“ (32 > 114mm)
use Fixed Jaw position B - Bridge position A.
See Fig 3.c
For Stock width 4” > 7” (100 > 178mm) use
Fixed Jaw position A - Bridge position B
6. SETTING UP
FITTING THE BRIDGE ASSEMBLY
Lay the MHL Bridge assembly face down - flat
side up and lay the CRB baseplate over it,
countersinks up.
Having chosen the location of the bridge; Align
the baseplate drillings over the MHL bridge
screw holes.
Using 2 x fixing screws (2) attach the bridge
through the baseplate, fit and tighten.
FITTING THE FIXED JAW
Having chosen the location of the Fixed Jaw;
Using 2 x screws (2) Align the Fixed jaw screw
holes with the holes in the baseplate, fit and
tighten. The MHL is now fitted - Re-fit the router
to the CRB7
7. OPERATION:
Firmly clamp the work piece to the bench –
rebate markings up. Loosen the MHL Bridge
pinch bolts and position the Adjuster Jaw (using
the Micro Adjuster) slightly wider than the size
of the work piece. Place the CRB7/MHL
assembly onto the work piece. Adjust the jaws
together; So that the assembly comfortably
slides up and down on the work piece without
binding or without play. Lock the Adjuster Jaw in
position with the 2x Pinch Bolts.
REBATE LENGTH:
Set the depth of the router
bit to just above the work piece surface. Slide
the MHL assembly until the router bit is just
touching the end mortise markings. Transfer the
Jaw Sight Line onto the workpiece or Use a
G-clamp as a physical end stop and clamp so it’s
touching the MHL Jaw. Slide the MHL assembly
to the other end of the mortise markings and
repeat.
REBATE WIDTH:
If the rebate is wider than the
router bit; complete all the routing passes on
one side of the mortise until the correct depth
has been reached. Then adjust the router cutter
position to the other side of the mortise
markings (using the Micro adjust on the CRB7)
and complete another set of machining passes
down to the matching depth. If the rebate is
very large, More sets of machining passes may
be required
REBATE DEPTH:
Depending on the depth of
mortise required and the power of the router;
several cutting passes maybe required to
complete the rebate depth.
TESTING:
Trial the cutting pass (router turned
off) several times. Checking that the markings
or end stops are in the correct position.
CUT THE MORTISE
FINISHING:
Should you require square
cornered rebates, use a sharp chisel to remove
the waste from the corners of the rebate.
IMPORTANT NOTE:
The MHL Jaws are fitted
with Sight Lines, so it’s easy to see and control
the length of each routing pass length.
However for ease of use and repetitive
accuracy; We recommend using 2 x clamps, 1 at
either end of the mortise. The MHL jaw will abut
the clamp head itself, giving a physical stop to
the length of the rebate; removing the guess
work from the process.
The MHL can only be used on stock that has
machined flat parallel sides.
To ensure accurate positioning and a smooth
cutting pass; Both mating surfaces of the jaws
are machined flat to a tolerance of +/- 0.05.
When machining mortises, leave the work pieces
as long in length; for as long as you can. Only
after the mortises have been completed should
the work pieces be cut to the finished length.
FITTING ABLATIVE CHEEKS TO JAWS
IMPORTANT NOTE:
We strongly recommend
fitting Ablative Cheeks when working on narrow
pieces E.g. the edge of a door.
They’ll protect the jaws from router bit damage
and further increase the stability of the MHL on
narrower stock.
Making the Ablative Cheeks from solid hardwood
is preferable, however ply or MDF will work.
Cut and machine the 2 x Cheeks to 12 x 1.1/2 x
3/4” (300 x 35 x 20mm), (Dimensions can vary
according to the users needs or preference).
Ensure the Ablative Cheeks are machined flat
then lightly and finish with glass paper.
Accurately mark out the drilling locations for the
2 x fixing holes by:
Marking a parallel line 9/32” (7mm) in from the
top edge of each cheek.
Measure and mark the centre point mid way
down the parallel line.
Then place it under the baseplate end drillings.
So the parallel line can be seen through the
drillings. Using a sharp pencil mark through the
drillings (see Fig 5).
Using a 3/16” (5mm) bit - through drill the 2x
fixing holes.
Using a 3/8” (10mm) drill bit - counter bore the
top surface so the screw heads sit 11/16
(17.5mm) below the surface.
The depth must allow the screw to locate fully
into the Jaw thread. 13/64” (5mm). (see fig 6)
Attach the 2 x Cheeks to the Jaws using the 4x
screws (8).
The Jaws can then be re-attached.
8. MAINTENANCE
Please use only MPOWER original spare parts.
Continual satisfactory operation depends upon
proper tool care and regular cleaning.
Cleaning:
Regularly clean accessory with a soft cloth.
Lubrication:
Your accessory requires no additional
lubrication.
Storage:
Return accessory to its packaging after use.
9. ENVIRONMENTAL PROTECTION
Recycle raw materials instead of disposing as
waste.
Packaging should be sorted for
environmental-friendly recycling.
This product and its accessories at the end of its
life should be sorted for environmental-friendly
recycling.
10. GUARANTEE
All MPOWER products are guaranteed against
any defects in either workmanship or material,
except products that have been damaged due to
improper use or maintenance.
Disconnect power tool and attachment from
power supply when not in use, before
servicing, when making adjustments and
when changing accessories such as
cutters. Ensure switch is in “off” position.
Always ensure cutter has stopped rotating.
Read and understand instructions supplied
with power tool, attachment and cutter.
Current Personal Protective Equipment
(PPE) for eye, ear and respiratory protection
must be worn. Keep hands, hair and clothes
clear of the cutter.
Before each use check cutter is sharp and
free from damage. Do not use if cutter is
dull, broken or cracked or if any damage is
noticeable or suspected.
The maximum speed (nmax) marked on tool
or in instructions or on packaging shall not be
exceeded. Where stated, the speed range
should be adhered to.
Insert the shank into the router collet at least
all the way to the marked line indicated on
the shank. This ensures at least 3/4 of shank
length is held in collet. Ensure clamping
surfaces are clean.
Check all fixing and fastening nuts, bolts and
screws on power tool, attachment and cutting
tools are correctly assembled, tight and to
correct torque setting before use.
Ensure all visors, guards and dust extraction
is fitted.
The direction of routing must always be
opposite to the cutter’s direction of rotation.
Do not switch power tool on with the cutter
touching the workpiece.
Trial cuts should be made in waste material
before starting any project.
Repair of tools is only allowed according
to tool manufacturers instructions.
Do not take deep cuts in one pass; take
several shallow passes to reduce the side
load applied to the cutter.
11. Safety Points
1
2
3
4
5
6
7
8
9
10
11
12
13
Jaw Position A
Fig 3.a
Bridge Position A
Adjustable Jaw
Min: 0”
Max 1 1/2”
Min: 0mm
Max: 36mm
Jaw Position B
Bridge Position B
Adjustable Jaw
Min: 4”
Max 7“
Min: 100mm
Max: 178mm
Fig 3.c
Jaw Position B
Bridge Position A
Adjustable Jaw
Min: 1 11/4”
Max: 4 1/2”
Min: 32mm
Max: 114mm
Fig 3.b
5
2
1/2”
(12.7mm)
3”
(76mm)
Fig 2.
5. 33/64”
(140mm)
