Using A Radialarm

The radial-arm saw is an excellent machine for cutting halving joints, since you can clearly see the shoulder lines you are sawing. Using a dado head removes more waste wood at one pass than a standard setup.

Adjust the blade to cut halfway through the work, and pull the saw towards you to cut the shoulder. Slide the work to one side, gradually removing more waste with each pass.

Clamp an end stop to the fence to cut a shoulder in the same place on identical workpieces. When cutting recesses for cross halving or T-halving joints,

3 Sawing the lap

Saw down to the shoulder, keeping the saw blade just to the waste side of the gauged line. You may find it easier to keep the cut vertical if you tilt the work away from you while sawing down one edge. Turn the work round and saw down the other edge, then finish off by sawing squarely down to the shoulder. Saw the shoulder line to remove the waste.

1 Marking out the joint

Taking the dimensions from the relevant components, score the shoulder lines with a knife and try square, and scribe the depth of the joint on each workpiece with a marking gauge.

2 Cutting the recess

Chisel out the waste from between the shoulders. Use the long edge of the chisel blade to check that the bottom of the recess is flat.

A means of joining an intermediate support to a frame, the T-halving joint is a combination of the cross-halving and corner-halving versions.

MAKING THE JIGS

Make a pair of identical L-shape jigs by gluing and screwing together 300mm (1ft) lengths of 75 x 18mm (3 x 3Ain) and 150 x 18mm (6 x 3Ain) prepared wood.

Corner Halving Joint

i* edge-to-cutter dimension »»j depth of cut

Half Lap Joint Jig

1 Marking and cutting the lap

Draw the shoulder line across the work and mark another line, the edge-to-cutter dimension (see below left), from the shoulder line. Align one of the L-shape jigs with this latter line, and clamp both the jig and work to the bench. To cut the lap, run the edge of the router base against the jig to form the shoulder, then remove the rest of the waste freehand.

2 Marking and cutting the recess

Mark two shoulder lines for the recess and clamp both jigs on top of the work, allowing for the edge-to-cutter dimension, as described above. Without altering the depth setting on the router, use the left-hand jig to cut one shoulder, and then move the router to the right-hand jig to cut the second one. Finally, clean out the waste in between.

MAKING THE JIGS

Make a pair of identical L-shape jigs by gluing and screwing together 300mm (1ft) lengths of 75 x 18mm (3 x 3Ain) and 150 x 18mm (6 x 3Ain) prepared wood.

T-HALVING JOINT

MACHINE CUT

A table saw or radial-arm saw is capable of producing accurate, but not particularly well-finished, halving joints. Using a router to cut the joint makes very crisp shoulders and perfectly flat surfaces. If you intend to make a number of joints, use a couple of simple jigs to guide the router.

Setting up the router

Set the depth of cut on the router to half the thickness of the workpieces. Measure from the edge of the base to the side of the cutter - use this edge-to-cutter dimension to position the jigs on the work.

i* edge-to-cutter dimension »»j depth of cut

Incorporate a dovetail to increase the strength of a T-halving joint. It is only marginally more difficult to make than the standard square-shoulder joint.

Incorporate a dovetail to increase the strength of a T-halving joint. It is only marginally more difficult to make than the standard square-shoulder joint.

Halving Joint

1 Marking the lap dovetail

Having marked out and cut a lap in the conventional manner (see page 60), use a template and knife to mark the dovetail on the workpiece.

1 Marking the lap dovetail

Having marked out and cut a lap in the conventional manner (see page 60), use a template and knife to mark the dovetail on the workpiece.

How Cut Lap Joint Jigsaw

2 Shaping the lap dovetail

Saw the short shoulders on both sides of the lap, then pare away the waste with a chisel to form the sloping sides of the dovetail.

2 Shaping the lap dovetail

Saw the short shoulders on both sides of the lap, then pare away the waste with a chisel to form the sloping sides of the dovetail.

Lap Shave Horse

3 Marking and cutting the recess

Using the dovetailed lap as a template, score the shoulders of the recess on the cross member. Mark the depth of the recess with a marking gauge (see page 56), and then remove the waste wood with a tenon saw and chisel.

How Cut Lap JointsDovetail Marking Gauge Template
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Responses

  • Charles
    How to make a dovetail halving by hand?
    6 years ago
  • Stewart
    How to make crosshalving joint with radial arm saw?
    6 years ago
  • antonino
    How to make a thalving joint?
    5 years ago

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