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How to Make a Scissor Joint (Step by Step with Pictures)

Learn how to make a timber framing scissor joint with a step-by-step guide, video, and pictures.

This post How to Make a Scissor Joint (Step by Step with Pictures) first appeared on AllFlavor Workshop and is written by About the author, Lukas

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How to Make a Scissor Joint (Step by Step with Pictures)

A scissor joint in timber framing, also known as double-faced halved rabbeted oblique scarf splice, is a 2-way interlocking type of a scarf joint. The method of assembling the wood pieces not only guarantees the strength of the joint, but also makes the joint stand out aesthetically. The scissors joint can be used vertically or horizontally and is used both for decorative purposes as well as an element for stronger structural applications and supporting purposes.

There are a few ways how to make a scissor joint. Depending on the size of the workpiece multiple tools can be used. These tools typically are a circular saw, a table saw, a hand saw, a hand plane, or a chisel. These options or any combination thereof will provide the desired result.

Timber frame joints. Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Timber Frame Joints - The Scissor Joint

In my case to make the scissor joint, as you will see in this article, I used a Japanese saw together with a chisel. Although a scissor joint is one of the basic wood framing joints and is one of the easier traditional woodworking joints to make, precision and accuracy are essential so that the two pieces fit together precisely. That is why Japanese saws (a Ryoba, or a Dozuki saw) are one the best hand saws for cutting the joint. They are versatile, sharp, thin, and easy to operate and they will provide the desired result.

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How to Make a Scissor Joint Video

If you want to see how to cut one of the simplest timber frame joints, watch the video below for a step-by-step guide on how to cut a scissor joint.

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Table of Contents

  1. How to cut a Scissor Joint Video
  2. The Material you will need
  3. General Questions
    1. What is a scissor joint used for?
    2. Which is better a scissor joint or a scarf joint?
  4. Timber Frame Scissor Joint Step-by-Step
    1. Step 1: Mark the wood pieces
    2. Step 2: Cut the Scissor Joint
    3. Step 3: Clean the splice
    4. Step 4: Assemble the wood pieces

Safety

*Safety is your responsibility. Make sure you know what you’re doing and take all necessary safety precautions while working with power tools. Safety comes first! Always be cautious and careful when using any power tool.

What you'll need to make a Scissors Joint

For the Scissors Joint:
2x Spruce wood – 39 mm x 29 mm x 155 mm (1.5 x 1,15 x 6.1″)

Tools:
Ryoba saw
Chisel
Marking Gauge
Hand Plane (optional)

Additionally, what you might need is a Dozuki saw, a square, a marking pen, and perhaps a few clamps. These tools are optional, but they make the work much easier.

Nevertheless, the tools you’d need would largely depend on the scale and specific requirements of the job. As scissor joints are typically used on structural elements you might need a circular saw or a hand saw, a hammer, or a nail gun.

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Timber frame joints. A scissor joint is one of the basic timber framing joints. Learn step by step how to make a timber framing scissor joint.

What is a scissor joint used for?

A scissor joint is used when joining two members in woodworking and is primarily used in interior fittings and carpentry. The joint is used both for structural support and decorative purposes. It is mainly used when structural elements are needed in longer lengths or when replacing an old beam with a new one.

There are a few variants to the scissor joint: a single-faced splice, a double-faced splice, or a triple-faced splice. All variants can be used with or without a key. The key does not have any structural function, it mainly serves to hold the splice together making sure the joint will not get pulled apart.

The length of the splice affects the use of the scissor joint. Longer splices are used for decorative purposes as opposed to shorter splices which are mainly used for structural purposes. The longer the splice the weaker the joint.

When used as a decorative element the length of the splice typically equals twice the size of the cross-section whereas when used as a structural element the length of the splice typically equals the size of the cross-section. Generally, the splice joint is at least twice the thickness of the wood.

A scissor joint is one of the basic timber framing joints. Learn step by step how to make a timber framing splice joint.
Timber Framing Scissors Joint

Which is better a scissor joint or a scarf joint?

A scissor joint is a type of scarf joint. These timber frame joints are used in interior fittings and carpentry and can be used both for support and decorative purposes.

Although there are a few variants to the scissor joint, the range of scarf joints is much wider, and therefore the possibilities of use and strength of the joints are more extensive.

There are two main categories of scarf – a plain scarf and an interlocking scarf.

  • A plain scarf joins two flat planes at an angle.
  • An interlocking scarf is additionally enriched with other elements such as hooks or keys, which make the joint stronger.

Both types of joints are usually dependent on additional mechanical fastening or adhesives to ensure joint strength.

Let's Start

When starting with the project, you should consider what will be the joint used for, how much pressure should it take, and if it will be used for structural or decorative purposes. That will determine the thickness of the material and the length of the splice (joint). Remember, the longer the splice the weaker the joint.

When making a scissor joint, wood pieces of different sizes (thicknesses) can be used. Regardless of the size, the procedure is the same.

After finishing the joint additional mechanical fasteners or adhesives are used to ensure the strength of the joint and to keep the joint closed.

How to Make a Scissor Joint Step-by-Step

Step 1: Mark the wood pieces

For the scissor joint, I am using a piece of spruce wood 40 x 30 x 155 mm. The wood pieces have a cross-section of 40 x 30 mm and the length of the splice is 80 mm.

Mark the joint using a square, a marking gauge, and a sharp pencil.
First, mark the length of the joint, then the diagonal cuts, and then the centerline on the top and bottom sides of the splice. Once finished, mark all the parts to be cut.

NOTE: The diagonal cuts are opposed to each other creating a “scissor” shape.

A scissor joint is one of the basic timber framing joints. Learn step by step how to make a timber framing splice joint.
How to make a scissors joint. Timber framing scissors joint.
How to make a scissors joint. Timber framing scissors joint.
How to make a scissors joint. Timber framing scissors joint.

Mark the second opposite piece in the same way as the first one. Both pieces are exactly the same and will be cut in the same way.

Once finished with all four sides you should end up with a pattern as seen in the picture below.

How to make a scissors joint. Timber framing scissors joint.
How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.

Step 2: Cut the Scissor Joint

Secure the workpiece in place and start with the cuts. To cut the scissor joint I am using a Japanese saw – Ryoba saw.

The first cut goes vertically along the centerline to about halfway through the splice. The second cut is made on the opposite side of the wood piece to the same depth.

TIP: Make the cut on the inner side of the line. Fine cleaning will be done with a chisel.

How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.

Next, turn the workpiece to the left and make a diagonal cut halfway through the workpiece until the marked triangle is cut off. Repeat the same process on the opposite side of the joint.

How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.
How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.

The counterpiece is made exactly in the same way as the first piece.

You should end up with two pieces that look like this.

Timber frame joinery. How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.

NOTE: After making all the cuts if there is still wood “between the scissors”, you can easily cut it off with a saw. This residual thin layer of wood is usually caused by making the cuts further from the centerline during the first cut. The farther the cut is made from the centerline, the thicker this residual layer of wood will be.

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Step 3: Clean the splice

For precise cleaning of the cuts, I am using a chisel. It’s essential to keep the chisel sharp because only a sharp chisel can ensure accurate cuts, leading to a perfect fit in wood joints. Make sure that all cuts align exactly with the marked lines.

Alternatively, a hand plane can be used.

TIP: You can use a reference piece of wood that serves as a guide for the chisel. Align the edge of the reference wood piece with the drawn line and cut off the wood excess on the joint with the chisel.

How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.
How to make a scissors joint. Timber framing scissors joint. double-faced halved rabbeted oblique scarf splice.
Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Fine cleaning of the joint with a chisel

Step 4: Assemble the wood pieces

The scissor joint consists of two identical pieces of wood that fit exactly into each other and overlap one another on an even plane.

Once all the pieces are cut, you can easily assemble the joint. Slide one piece into the other and press both pieces together with force. If done well you will get a really nice snug fit.

Additionally, to ensure the strength of the joint and to keep the joint closed you can use mechanical fasteners, adhesives, or hooks and keys.

Timber frame joints. Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Wood joinery. Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Timber frame joints. Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Basic timber framing joints - scissor joint
Timber frame joints. Making a timber frame scissors joint. Double-faced halved rabbeted oblique scarf splice.
Scissor joint - lock

Now you have a scissor joint.

This double-faced halved rabbeted oblique scarf splice (without a key) is the basic type of a scissor joint. There are also other types such as the single-faced, the double-faced, or the triple-faced halved rabbeted oblique scarf splice. All of them can be used with or without a key.

It is important to take into account the type of pressure to which the joint will be exposed and the visibility of the joint. These factors will determine the length of the splice.

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Timber frame joints. A scissor joint is one of the basic timber framing joints. Learn step by step how to make a timber framing splice joint.

Conclusion

So, this is the double-faced halved rabbeted oblique scarf splice, or as more widely known, the scissor joint. It is one of the basic timber frame joints and quite easy to make, although precision in creation is required to end up with a nice flush fit. So, if you are planning to start with Japanese joinery this is a good adept to start with.

Keep in mind that this joint was shown using small wood pieces. Since the joint is usually for structural support, the actual wood pieces would be bigger. While the joint-making process remains the same, the methods and tools might vary.

If you are interested in other woodworking joints check out this beautiful 3-way joint – the castle joint.

Timber Frame Joints - Scissors Joint

Jigs and tools used for this project:

Other Basic Woodworking Joints

Castle Joint

How to make a Castle Joint Step by Step

Frequently Asked Questions

I’ve got you covered with all the essential info – check out the FAQs below to clear any doubts.

How difficult is it to cut a scissor joint?

It’s not very difficult; the scissor joint is one of the basic timber framing joints and is suitable for woodworking beginners.

What are the best timber framing joints?

The best timber framing joints include the mortise and tenon, dovetail joint, scarf joint, and bridle joint. These joints are renowned for their strength, durability, and versatility in various woodworking applications.

What type of wood is good for framing?

For softwoods, Douglas fir, southern yellow pine, spruce, and hemlock are popular choices. When it comes to hardwoods, oak, ash, maple, and cherry are often selected for their strength and resilience.

This post How to Make a Scissor Joint (Step by Step with Pictures) first appeared on AllFlavor Workshop and is written by About the author, Lukas

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