How to use a mitre box to cut coving

 
     
     
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Preparation

 
 Wonkee Donkee A tenon saw is ideal for use with a mitre box 

A tenon saw with its fine teeth is ideal for cutting coving, creating a neat and precise cut. However for large types of coving e.g. 280mm (11") x 223mm (8.75") an adjustable mitre box should be used and a deep bladed tenon saw may also be required.

 
     
 Wonkee Donkee Fix your mitre box to your vice or workbench 

Securing the mitre box in your vice or attaching it to your workbench will give you added stability when you are sawing.

 
     
 Wonkee Donkee Measure and mark the coving to be cut using your mitre box 

Whenever you intend to cut coving it's important to measure the length of coving required and mark the position the coving is to be cut with a pencil. 

 
     
   

 Coving internal corner

 
 Wonkee Donkee Cutting left hand piece of coving for an internal coving joint 

Step 1 - Place coving in mitre box

Place the coving in the mitre box with the wall edge of the coving sitting against the mitre box side closest to you and the ceiling edge of the coving against the base of the box (upside down as it would appear on the wall).

 

The point at which the coving should be cut should be lined up with the 45 degree saw guide slot on the right hand side of the mitre box wall (the side closest to you).

 
     
 Wonkee Donkee Cutting left hand piece of coving for an internal coving joint 

Step 2 - Cut at 45 degree angle

Simply cut at a 45 degree angle from bottom right to top left of the mitre box. The piece of coving to the right of the saw blade can be discarded.

 
     
 Wonkee Donkee Cutting the right hand side of your coving 

Step 3 - Cutting the right hand section

For the right hand section, place the coving in the mitre box with the wall edge of the coving sitting against the mitre box side closest to you and the ceiling edge of the coving against the base of the box (upside down as it would appear on the wall). 

 

The point at which the coving should be cut should be lined up with the 45 degree saw guide slot on the left hand side of the mitre box.

 

 
     
 Wonkee Donkee Simply cut at 45° angle from bottom left to top right of the mitre box to achieve a perfect corner 

Step 4 - Cut at 45 degrees

Simply cut at a 45 degree angle from bottom left to top right of the mitre box. The piece of coving to the left hand side of the saw blade can be discarded.

 
     
 Wonkee Donkee finished internal coving joint 

Step 5 - Finished internal corner

This is what an internal corner should look like. On an internal corner, the wall edge is always the longest side of the mitre.

 
     
   

Coving external corner

 
 Wonkee Donkee How to cut an external corner for coving 

Step 1 - Cutting left hand section

For the left hand piece, place the coving in the mitre box with the wall edge of the coving sitting against the mitre box side closest to you and the ceiling edge of the coving against the base of the box.

 
     
 Wonkee Donkee Cutting an external corner on coving using a mitre box 

Step 2 - Cut at 45 degrees

Simply cut at a 45 degree angle from bottom left to top right of the mitre box. The piece of coving to the right hand side of the saw blade can be discarded. 

 
     
 Wonkee Donkee Cutting the right hand piece on an external corner of coving 

Step 3 - Cutting the right hand section

For the right hand piece, place the coving in the right hand side of the box with the wall edge of the coving sitting against the mitre box side closest to you and the ceiling edge of the coving against the base of the box.

 

 
     
 Wonkee Donkee Cutting the right hand piece on an external corner of coving 

Step 4 - Cut at 45 degrees

Simply cut at a 45 degree angle from bottom right to top left of the mitre box. The piece of coving to the left hand side of the saw blade can be discarded.

 
     
 Wonkee Donkee Outside corner of coving cut using a mitre box 

Step 5 - Finished external corner

This is what an external corner should look like. On an external corner, the wall edge is always the shortest side of the mitre. 

 
     
   

Joining two lengths of coving

 
 Wonkee Donkee Joining two lengths of coving together 

Step 1 - Joining lengths of coving

To join two lengths of coving, simply put the left hand piece to be cut into the left hand side of the mitre box.

 
     
 Wonkee Donkee Joining two lengths of coving together 

Step 2 - Place coving into mitre box

Make sure the wall side of coving is against the side of the box closest to you and the ceiling side of the coving is at the bottom of the box.

 
     
 Wonkee Donkee Joining two lengths of coving together 

Step 3 - Cut from bottom left to top right

Take a sharp saw and cut from the bottom left to the top right in the 45 degree slot.

 
     
 Wonkee Donkee Cutting the right hand side when joining coving 

Step 4 - Cut right hand side of coving

For the right hand side of the joint simply put the right hand piece in the right hand side of the mitre box. 

 
     
 Wonkee Donkee Cutting the right hand side when joining coving 

Step 5 - Place coving in mitre box

Make sure the wall side of coving is against the side of the box closest to you and the ceiling side of the coving is at the bottom of the box. 

 
     
 Wonkee Donkee Cutting the right hand side when joining coving 

Step 6 - Cut coving from bottom left to top right

Take your saw and cut from the bottom left to the top right of the mitre box to produce a 45 degree cut.

 
     
 Wonkee Donkee A completed length of coving joined together 

Step 7 - Finished joint

Take the two 45 degree faces on the coving and place them together to create a perfect straight joint with no unsightly gaps.

 
     
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