How to Cut a Mitre Joint

Mitre joints are used in a number of ways, including picture framing, around doors, windows and mouldings. Note that mitre joints are not very strong and so not designed to hold weight.

There are many times when you will need to cut internal and external mitre joints, for example, if you are fitting coving or skirting boards. Knowing how to cut a mitre joint correctly will help you from wasting the materials you are working with by reducing mistakes. Here we provide you with a guide that shows you how to cut a mitre joint so that you get a perfect mitre cut each time.

Step 1

Get yourself a mitre box or saw. A mitre saw or box allows you to cut both 45 and 90 degree angles and these are available in either plastic or wood. Some mitre boxes have an extended back end which allows you to easily clamp it into a workmate or work bench.

Step 2

When cutting mitre joints this requires fine cutting to produce a nice fit between each item you are cutting. Most jobs are best suited to the use of a Tenon Saw which has fine teeth and fits nicely in a mitre box.

Step 3

Cutting Skirting – Internal Corners – Left: Place the skirting in the mitre box so that the backside sits against the mitre wall, furthest away from you, and cut a 45 degree angle from the bottom left to the top right.

Step 4

Cutting Skirting – Internal Corners – Right: Place the skirting in the mitre box so that the backside sits against the mitre wall, furthest away from you, and cut a 45 degree angle from the bottom right to the top left.

Step 5

Cutting Skirting – External Corners – Left: Place the skirting in the mitre box so that the backside sits against the mitre wall, furthest away from you, and cut a 45 degree angle from the bottom right to the top left.

Step 6

Cutting Skirting – External Corners – Right: Place the skirting in the mitre box so that the backside sits against the mitre wall, furthest away from you, and cut a 45 degree angle from the bottom left to the top right.

Step 7

Cutting Skirting – Straight Length Cuts- For both left and right pieces cut a 45 degree angle from the bottom right to the top left.

Step 8

Cutting Coving – Internal Corners – Left: Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to left hand side of the box and cut a 45 degree angle from the bottom right to the top left.

Step 9

Cutting Coving – Internal Corners – Right Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to right hand side of the box and cut a 45 degree angle from the bottom left to the top right.

Step 10

Cutting Coving – External Corners – Left: Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to left hand side of the box and cut a 45 degree angle from the bottom left to the top right.

Step 11

Cutting Coving – External Corners – Right: Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to right hand side of the box and cut a 45 degree angle from the bottom right to the top left.

Step 12

Cutting Coving – Straight Length Cuts- Left: Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to left hand side of the box and cut a 45 degree angle from the bottom left to the top right.

Step 13

Cutting Coving – Straight Length Cuts- Right: Place the coving in the mitre box so that the backside of the coving that sits against the wall is against the mitre wall and the ceiling edge sits on the bottom of the mitre box, nearest to you. Position the coving so to right hand side of the box and cut a 45 degree angle from the bottom left to the top right.

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Cutting Mitresmitre jointsMitre Saw

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