Woodworking: Sharpening Techniques

A sharp tool is a joy to use, and essential for precise, safe woodworking. In this hands-on class, you’ll learn the principles, techniques, and best practices for sharpening and maintaining your hand tools. We’ll cover the differences between “sharp” and “keen” edges, explore various sharpening theories and media, and practice using jigs and hand sharpening techniques. By the end, you’ll be able to bring your plane irons and chisels to a surgical level of sharpness and know how to maintain them for long-lasting performance.

Students can bring a hand plane iron, chisel, or both to practice working with personal tools. If you don't have a personal tool to sharpen, one will be provided for practice during the class.

Learning Objectives

• Identify the key differences between “sharp” and “keen” edges and explain their significance in woodworking.

• Describe the main theories of sharpening, including edge geometry and the specific requirements for plane irons vs. chisels.

• Select appropriate sharpening media (e.g., diamond plates, water stones) and explain their advantages and limitations.

• Demonstrate the setup and use of sharpening tools and jigs, including the David Charlesworth “Ruler Trick.”

• Assess the condition of a hand plane iron or chisel and determine necessary sharpening steps.

• Perform the complete sharpening process:

  • Flattening the back

  • Resetting the primary bevel to 25°

  • Refining the edge to achieve a surgical sharpness

• Execute basic and advanced sharpening techniques, including freehand sharpening.

• Apply proper tool maintenance practices to preserve sharpness and prolong tool life.