To sharpen a hedge trimmer, secure it in a vise, remove debris with a brush, and stroke the cutting surface with a 10-inch mill file, maintaining the original angle. Remove the rough burr on the other side of the cutting tooth by using flat strokes with the file.Continue Reading
Secure the trimmer in a table vise in a position that makes it easy to reach the teeth. Make sure the trimmer is unplugged, and put on safety goggles.
Remove debris from the teeth with a medium-weight brush.
Inspect the teeth for nicks, deep scratches and dull cutting edges. Do not file teeth that look sharp and undamaged. Hold a 10-inch mill file in the groove of the first dull or damaged tooth at the same angle as the original cutting surface. Push the file down to sharpen the edge of the tooth. Repeat about 10 times until the tooth appears sharp.
Sharpening the tooth makes a rough edge on its opposite side. Hold the file flat against the rough area, and rub until the roughness is gone.
Continue to work along the cutting bar sharpening the teeth that need it. Nicked teeth may take extra strokes to create a sharp, smooth cutting surface.
Rub both the top and bottom of the teeth with a soft cloth and some multipurpose oil.