Sharpening Handbook

Because sharp enough

... usually is not

String Trimmer Line Cutter

String Trimmer’s Line Cutter (red)
(as seen from the bottom)

Edge Angle

String trimmers often have a line cutter incorporated into the cutter head to cut the newly extended string line. In the picture to the right,

the spinning head is grey,
the strings are yellow, and
the cutter is red

Use a machinist’s hand file for the sharpening process to ensure the blade’s temper is not lost.

Sharp tools are important, so I sharpen them every day.

Yutaka Mogami, 3rd generation master of Edo sashimono

Guidelines shown below are for Included Angles (α).

General Guidelines
α	Notes
30°	As shown in red in the picture above right, sharpen the outside of the blade.

Notes & Comments

Grind Shape & Experience

The shape of the grind used is a call best made by the tool's use, based on your own experience. Additional notes are available on separate web pages for Grind Profiles, and Micro / Secondary Bevels.