45 degrees is the correct angle, looks like you laid the cornices flat in the mitre box to cut them. You need to cut the angle with the cornice standing up as it would on the cupboards.
How do you do a 45 degree angle on a cornice?
Mitre boxes make easy work of mitring the cornices. Before you begin, you need to set the bevel angle of the mitre box at 45 degrees, and leave the bevel setting at this angle throughout the entire job. Set the saw at 45 degrees right to cut the pieces that will form the right inside and the left outside corners.
How do you join cornice?
Cut off a small 100mm length of cornice to use as a template. Use this piece to mark the top and bottom edges of the cornice on the walls and ceiling all around the room. Make the marks at regular intervals and then join them with a straight edge. Use a mitre box or a specialised tool.
How do you make a coving Mitre template?
Preparation
Step 1 – Cut template. Using the fine tooth saw, cut a 150mm (6″) section of coving to use as a template.Step 2 – Mark coving position. Position the template you have just cut so it sits where the ceiling and wall meet. Step 3 – Prepare wall and ceiling. Step 4 – Determine type of cut.
