CRB7 Combination Router Jig - Instructions download



Thank you for purchasing the MPOWER Combination Router Base (CRB7), we hope you enjoy using it.

The CRB7 should give lasting performance if used in accordance with these instructions.




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.



  • Adjustable Dadoing with a Clamp Guide
  • Adjustable Mortising for material 2” (50mm) > 5/16” (125mm)
  • Adjustable Anti-tilt support
  • Adjustable Groove Copier
  • Offset Baseplate
  • Small Circle Router Compass: Min. Radius 3/4” (19mm) >8.13/16”(224mm)
  • Large Circle Router Compass Min. Radius 7” (180mm) > 25” (635mm)
    Note: All dimensions shown are based on a medium sized router being used with a 1/4” (6.3mm) router cutter.



  • Router with a suitable rod size and centers.
  • Router cutter / Router bit.
  • Clamps.
  • 2 x 1/2” (13mm) A/F open ended spanner.
  • 5/16” (8mm) A/F open ended spanner.
  • Hand Tools.



  1. Items Enclosed
  2. Setting Up
    • Fitting the CRB7 to your router
    • The self adhesive rule The micro adjuster The lock bars
  3. Operation
    • Adjustable Dadoing with a Clamp Guide Adjustable Mortising Anti-tilt Support
    • Adjustable Groove Copier Offset Baseplate
    • Cutting Small Circles Pivot Pin Storage
    • Cutting Large Circles
  4. CRB7 Accessories
    • Maintenance
    • Environmental Protection
    • Guarantee
  5. Safety Points

The following symbols are 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.

Refer to the instruction manual provided with your power tool.


1 Bridge   6D Fixed Rod
1B Bridge Spacer   6E Fixed Rod M8 Locknut x 2
1C Bridge Slot   6F Fixed Rod Crank Plate
1D Bridge pinch bolt hole   7 Offset Handle
2 Baseplate   8 Anti-tilt Leg
2B Baseplate Letterbox   9 Pivot Pin
3 Bridge Pinchbolt   10 Mortise Pillars
4 Micro Adjuster   11 Self adhesive Rule
4B Micro Adjuster Lock Nut   12 No.6 x 1/2” Woodscrews x 6
5 Adjuster Guide Rod 5/16” (8mm)   13 M4 x 25/64’ (10mm) Screws x 3
5B Adjuster Guide Rod M5 Locknut   14 9/32” (7mm) Guide Rods
5D Adjuster Rod   15 Compass Pivot Hub
5E Adjuster Rod Crank Plate   16 25/64” (10mm) Compass Rods x 2
6 Fixed Guide Rod 5/16” (8mm)   17 No.6 x 1/2” Woodscrews x 3
6B Fixed Guide Rod M5 Locknut   18 Lock Bars X 2





1. Guide Rod selection

The CRB7 is fitted with 5/16” (8mm) diameter guide rods (5 & 6).

If the router base rod drillings are smaller, fit the 9/32” (7mm) guide rods.

2. Loosen the Lock Nuts

Using 1 x 1/2” (13mm) spanner, slightly loosen fixed rod nut (6E) and micro adjuster nut (4B).

3. Initial alignment

Position the router in front of the CRB7.

Align the router base rod drilling (A) with Adjuster Rod (5).

4. Cutter alignment

Check that the router cutter will safely align within the letterbox cross hatch area.



5. Guide Rod adjustment

Flip cranked adjuster rod (5) to its outer position.

6. Crank Plate adjustment

For further adjustment fit the rods in the other crank plate drillings (5E2 & 6E2).

Loosen the M5 nut (5B) using a 5/16” spanner.

Move the adjuster rod (5) to the other crank plate drilling (5E2).

Replace washers and nuts and tighten.

7. Fitting the router

Align fixed rod (6) with the router base rod drilling (B), so that both rods are aligned.

Slide the router onto both rods until it stops at the Bridge end of the CRB7 assembly.

8. Setting the Fixed Rod


Follow the below steps in order:

  1. Tighten router base wing bolt (A).
  2. Finger-tighten fixed rod nut (6E).
  3. Tighten router base wing bolt (B).

Using 2 x 1/2” (13mm) open ended spanners, tighten both fixed rod nuts.

Tip: Using two spanners when tightening the fixed rod nuts will prevent the rod setting being disturbed.

Both guide rod positions are now set.

Important - Before attempting any machining pass:
Ensure that the router is securely fitted to the CRB7 by checking ALL CRB7 fixings, including router base wing bolts and micro adjuster lock nut.


Many routers are manufactured with a cast index line (11A).

• If the router has no index line, draw one on the base using a fine tip marker pen.

With the router fitted to the CRB7:

• Position the rule (11) along the edge of the router base.

A measurement can then be taken as the router is moved.

Once happy with the rule location:

  • Ensure that the baseplate (2) is clean.
  • Peel off the self adhesive backing paper.
  • Stick in position.


Use the lock bars (18) to help tighten and loosed the guide rods.


  • Plunge the router cutter to a level just above the workpiece and lock in position.
  • Loosen the router base wing bolt (I6) on the fixed guide rod (6).
  • Lock the router base wing bolt (I5) on the adjuster guide rod (5).
  • Rotate the micro adjuster (4) to move the router and cutter into position.
  • Lock the adjustment in position by tightening the adjuster nut (4B) against the bridge (1).

Tip: Positioning the router base Wing Bolts towards the bridge end of the CRB7 will increase micro adjuster accuracy.

Using the index markings

The micro adjuster and bridge have corresponding red index lines. (1A & 4A)

1 x Micro adjuster rotation = 5/100” (1.25mm).
4 x Rotations = 3/16” (5mm).

Removing the slack from the adjuster thread.

  • Loosen both router base wing bolts and turn the adjuster (4) in the desired direction to engage the thread.
  • Rotate until index markings (1A & 4A) align.
  • Re-tighten the wing bolt on the adjuster guide rod.
  • Should the router cutter need to be adjusted in the opposite direction repeat the above step.


Adjustable Dadoing with a Clamp Guide

  • Fix the clamp guide (J) on the workpiece.
  • Butt the bridge end of the CRB7 up against the clamp guide.
  • Slide the router along the guide rods to position the cutter.
  • Use the micro adjuster (4) if required.
  • Lock the router position on both guides rods using the router wing bolts (I)

For a deep rebate, several light cutting passes may be preferred.

Before use, check that the router is firmly secured to the CRB.


Adjustable Mortising

Material widths between:
2” (50mm) > 4. 7/8” (125mm)
Fit the mortise pillars through hole locations F

Material widths between:
4 7/8” (125mm) - 8 5/8” (219mm)
Fit the mortise pillars through holes C-D or C-H

  • Fit the mortise pillars (10) to the underside of the baseplate (2).

  • Fit the cutter to the router and re-fit the router onto the CRB7.
  • Position the CRB7 with a mortise pillar (10) either side of the work piece.
  • Rotate the CRB7 clockwise until both mortise pillars contact the sides of the workpiece.
  • Adjust the cutter position to the mortise markings, use the micro adjuster if required.
  • Lock the router position on both guides rods using the router wing bolts.

When cutting the mortise, ensure an even pressure is maintained between the mortise pillars and workpiece.

If the mortise is positioned at the end of the work piece, clamp extended battens (L) to either side.

Check that the mortise pillars can complete the mortise without running off the end of the battens.

For a deep mortise, several light cutting passes may be preferred.


Anti-Tilt Support

The Anti tilt leg is a two part assembly.

Max. Support height = 3 1/8” (80mm)
Min. support height = 5/16” (8mm)

  • Slide the anti-tilt leg (8) into the bridge from the underside.
  • Tighten the bridge pinch bolt (3) to lock it in position.

  • Slide the router onto the CRB7 rods and lock in position using the wing bolts (I)
  • Rest the CRB7 and router on the work piece (M), then release the bridge pinchbolt (3) to set the anti-tilt Leg depth.
  • Lock the anti-tilt Leg in position.

Before routing, check that the bench surrounding the work piece is smooth, even and clear of obstacles.


Adjustable Groove Copier

  • Make copy batten (N) Min. Length 6. 5/16” (160mm) in timber or solid plastic i.e. nylon or polyethylene.
    Note: The batten profile should copy the size and shape of the router cutter.
  • Test the batten in a sample groove to ensure a good but not over-tight fit.
  • Rout the first groove into the workpiece. Use a clamp guide or side fence.
  • Using 3 x No.6 woodscrews (12) fix the batten to the underside of the baseplate via hole E & C.

To avoid splitting the batten, pilot drill and screw into position by hand.

  • Fit the CRB7 to the router.
  • Check that the batten (N) slides into the first groove and moves smoothly along its length.
  • Set the required distance between the router cutter and batten.
  • Use the micro adjuster (4) to finely adjust cutter position if required.
  • Lock the router in position using the router base wing bolts (I)

The second groove can now be routed.

  • Slot the batten into the second groove to rout the 3rd groove.

Offset Baseplate

  • Slide the router onto the CRB7 guide rods.
  • Position the router at the opposite end from the Bridge (1).
  • Lock the router in position using the wing bolts (I)

The router cutter should just sit safely within the baseplate ‘letterbox’.

  • Fit the offset handle (7) into the bridge and lock in position using the bridge pinchbolt (3).

Ensure that the CRB7 handle end remains over the work piece.

Cutting Small Circles.

Circle Sizes:
Maximum Radius 8. 13/16” (224mm)
Minimum Radius 3/4” (19mm)

Pivot Pin Locations H and C:

Maximum Radius Setup:
8.13/16” (224mm) Hole H

Minimum Radius Setup:
3/4” (19mm) Hole C


  • Mark out the circle on the work piece.
  • Drill a 1/4“ (6mm) hole, a 1/4” (6mm) deep at the center of the circle.
  • Fit the pivot pin (9) to the underside of the baseplate.

You can replace the pivot pin (9) with a No.6 woodscrew (12).

  • Attach the router to the CRB7.
  • Position the CRB7 so that the pivot pin (9) fits in the center drilling.
  • Position the router and cutter as required.
  • Lock in position using the router wing bolts.

Tip: To avoid a central drilling in the workpiece, use a 1/4” (6.35mm) thick overlay secured by double sided tape. Rout through the overlay and into the workpiece beneath.

Pivot Pin Storage

The pivot pin (9) can be stored in the back of the bridge (1). The M4 screw (13) must be fully screwed into the pivot pin (9) for the magnet to work.


Cutting Large Circles

Circle Sizes:

Maximum Radius 25” (635mm) Minimum Radius 7” (180mm)

  • Measure and mark out the position, size and center point of the circle.
  • Line up the Compass Hub (15) drilling with the center point of the circle.
  • Screw the Hub into position.

Ensure that the Hub is secured tightly but still free enough to rotate.

  • Assemble the 10mm compass rods and tighten using the lock bars.

  • Screw the rod assembly into the back of the CRB fixed guide rod (6D) and tighten using 1 x lock bar.

  • Slide the CRB7 rod assembly through the hub.
  • Position the router and cutter using the micro Maximum R25” (635mm) adjuster if required.
  • Lock the router in position using the router base wing bolts (I).
  • Lock the hub pinchbolt (15B)

Before routing the circle ensure that:

The hub and rods are securely fastened.

The center and outer section of the workpiece are supported.

Tip: To ensure a consistent cutting path always apply a slight pressure away from the Compass Hub when routing. If it helps, imagine the rods are a piece of string and you need to keep the string tensioned to maintain the distance between pivot point and router.



Please only use MPOWER original accessories.


The solution to the serious issue of controlled cutter access into the edge of a board. Cutting Mortises, Hinges, Lock Rebates and Fluting is now safer, quicker and more accurate than before.


A fast and accurate method of consistently trimming solid hardwood and iron on edging flush to its core panel. The kit can also be used to trim off the excess wood when using dowel plugs.


Combines with the fine adjustment of the CRB7 to improve router control and offer greater edge to rebate range.

13/32” (10mm) GUIDE ROD PAIR

For routers bases with 13/32” rod drillings.

15/32” (12mm) GUIDE ROD PAIR

For router bases with 15/32” rod drillings.


The accessory has been designed to operate over a long period of time, with the minimum amount of maintenance. Continual satisfactory operation depends upon proper tool care and regular cleaning.


• Regularly clean jig with a soft cloth.


• The CRB7 requires no additional lubrication.


• The CRB7 can be stored in its packaging, or can be hung on a wall hook.


Recycle raw materials instead of disposing as waste.
Packaging should be sorted for environmental friendly recycling.
The product and its accessories at the end of its life should be sorted for environmental-friendly recycling.


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.

Our policy of continuous improvement means that specifications may change without notice. MPOWER Tools Limited cannot be held liable for any material rendered unusable, or for any form of consequential loss.


  1. 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.
  2. Read and understand instructions supplied with power tool, attachment and cutter.
  3. Current Personal Protective Equipment (PPE) for eye, ear and respiratory protection must be worn. Keep hands, hair and clothes clear of the cutter.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. Ensure all visors, guards and dust extraction is fitted.
  9. The direction of routing must always be opposite to the cutter’s direction of rotation.
  10. Do not switch power tool on with the cutter touching the workpiece.
  11. Trial cuts should be made in waste material before starting any project.
  12. Repair of tools is only allowed according to tool manufacturers instructions.
  13. Do not take deep cuts in one pass; take several shallow passes to reduce the side load applied to the cutter.

Manufactured by MPOWER Tools Ltd

Tel: 0044 (0)1980 629 526 Email: Email: Web:

Manor Farm Reserve - Newton Tony - Salisbury - Wiltshire - SP4 0HA - UK

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