How to create round corners and convex surfaces with a file?

29th February 2020


	How to create round corners and convex surfaces with a file


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			This process is similar in many ways to cross filing, but without the sideways movement.

			You will need a file with a flat face. Hand, flat and half round files will work best.

			Creating a curved surface
			Step 1 – Prepare workpiece Clamp the object you are going to be filing into a vice so that it is secure and doesn’t wobble around. Don’t forget to use a filing block!

			Step 2 – Grip file securely at both ends Use your dominant hand to hold the handle of the file, with your thumb aiming for the file’s point. Grip the point of the file between the thumb and forefinger of your non-dominant hand.

			Step 3 – Tilt point upwards Before you start to file, tilt the point of the file upwards and push the handle downwards. This will set the file up so that you can start to create the round edge as soon as the file starts moving.

			Step 4 – Push stroke Applying light pressure, push the file forwards. As you do so, push the point of the file downwards and lift the handle of the file upwards.



			This rocking motion will create a curve on the surface you’re filing.

			Step 5 – Draw stroke Return the file back to its starting position, but lift it away from the workpiece to do it.

			Step 6 – Repeat Repeat this process, moving along the workpiece until you have rounded the entire edge or surface that you want to add a curve to.

			Corners or convex surfaces?
			The technique for creating rounded corners and convex surfaces is almost identical, but for two key differences.

			To create a smooth corner, the file needs to start flat against the top of the workpiece. On a convex surface, you could choose how steep the start of your curve would be.

			When rounding a corner, you will need to tilt the file relatively quickly as you are rounding off a very small area. If you were working on a convex surface, you would be tilting the file much more slowly.