Blades are truly sharp when flat steel faces meet at an acute angle.
However, sharpening a blade starts a process of deformation in the stone,
and each time a blade is sharpened, its own flatness gets progressively damaged.
Achieving true sharpness has traditionally required long years of experience,
and a huge investment of time and effort.
The most important things are to create flat faces on the blades,
and to keep the sharpening stones flat in turn.
Using Shapton’s KUBO Diamond Reference Lapping Plate together with
our sharpening stones can help you reach an unprecedented level of flatness.
The KUBO’s blade correction side helps you create blades that are as flat as possible,
while the sharpening stone correction side keeps your stones flat too.
The stones you are intending to lap should be immersed in water for 2 to 3 minutes before starting work on them.
When lapping non-Shapton stones, you should ensure the stones absorb plenty of water first.
As a guide, use a pencil to draw a grid on the stone surface to be flattened.
Place the KUBO somewhere stable, with the sharpening stone correction face (side A) on top.
Splash on enough water to permeate the whole plate.
Ensure the stone to be lapped has absorbed plenty of water, then lay it on the sharpening stone correction face (side A),
and repeat the motion shown in steps ① and ② a few times each.
Next, turn the sharpening stone around by 180 degrees and do the same again.
Once the sharpening stone is flat, finish it lightly as shown in step ③.
Parts where the lines get erased show where the sharpening stone correction face has made contact,
i.e. where flattening has been performed correctly.
When complete, chamfer the stone’s edges.
Once you have finished lapping, rinse off any slurry promptly before putting the KUBO into storage.
We also recommend using a brush at this time.
■ Place the KUBO somewhere stable, with the blade correction face (side B) on top.
■ Use water throughout.
■ When correcting the blade, only exert force when pushing, move slowly so that the blade does not bend, and use the whole plate rather than sticking to one area.
■ If the blade has lost its flatness, its central area will be scraped first.
This will look like an ellipse, as in step ①.
As correction progresses, the ellipse will gradually extend as shown in step ②.
As it finally becomes flat, it will appear as in step ③.
■ Very small blades or blades with sharp tips should be corrected using the unpatterned part.
The procedure changes depending on the initial state of the blade.
If the blade is dull
use steps ③▶④▶⑤
If the blade has lost its flat faces
use steps ②▶③▶④▶⑤
If the blade is nicked
use steps ①▶②▶③▶④▶⑤
Long use of this product can lead to abrasion/attrition of the diamonds.
If the polishing ability declines, you can make use of our diamond re-electrodeposition service.
Please contact us for details such as the cost, etc.