Projection is a setting, not a guess
The distance a blade projects from a honing guide helps determine its sharpening angle. A few millimeters of change can alter where the abrasive contacts the bevel. Use the guide’s registration system or a clearly labeled setup block made according to its instructions. Record the blade type and intended setting together. Two guides may require different projections for the same angle because their geometry differs. Do not copy a measurement from another brand and assume the result will be identical.
Seat the blade consistently
Clean the guide’s contact surfaces before clamping the blade. A small chip or smear of debris can hold it at an angle. Check that the edge sits square to the guide unless the particular tool deliberately requires another shape. Tighten the clamps evenly and only as directed. Very narrow, tapered, or irregular blades may need a different holder rather than extra force. Confirm the blade cannot shift before bringing the edge to the abrasive; a moving blade defeats the purpose of the guide.
Use pressure to preserve the shape
Apply controlled pressure where the guide instructions indicate. Heavy pressure at one corner can sharpen that corner faster and change the edge shape. Use enough of the abrasive surface to avoid concentrating wear into a narrow track. Keep the abrasive stable and your fingers behind the edge. If you intentionally want a slight camber on a plane blade, learn that as a separate technique and mark the blade accordingly. Accidental rounding on a chisel is usually a setup or pressure problem to correct.
Build a short sharpening record
A simple note can list the guide, projection, abrasive sequence, and any secondary bevel setting. Keep that information near the sharpening station so it is available when the tool becomes dull during a project. The goal is a quick maintenance habit, not a complicated ritual. After honing, inspect the edge and test in scrap. If you changed the blade projection, note the change rather than relying on memory. Clean and store the guide so its roller and clamping faces remain dependable.
What to take with you
- Use the setting for your actual guide.
- Clean registration surfaces before clamping.
- Repeatable setup makes quick touch-ups possible.
A few good questions
Why is only one corner becoming sharp?
The blade may be skewed in the holder, the abrasive may be uneven, or your pressure may be concentrated on one side. Check those causes separately before changing the projection. A guide controls one part of the geometry, but it does not automatically correct every alignment or pressure problem in the setup.
Keep learning
Further reading from primary sources. Follow the instructions for your own tools and products.