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Synergy of geometrical grooves with powder
The surface of NAORU is covered with grooves laid out in a geometrical pattern based on the principles of physics.
The grooves increase the synergy between the plate and the lapping powders supplied with it, and also improve speed and accuracy when flattening any roughness on a sharpening stone.
Choose which lapping powders to use - coarse, medium or fine (fine sold separately) - according to the grit of the stone to be flattened.
The quality of the finish you obtain on the sharpening stone surface will vary depending on the type of powder used, so be sure you choose the right powder for the particular stone you will be lapping.
For sharpening stones of 40 microns or above (320 or below), use coarse powder.
For stones of 4 to 30 microns (500 to 3000), you can use coarse powder initially if the stone is quite uneven, to scrape it roughly, but then use medium powder to re-lap it.
Normally only medium powder is needed.
For stones of less than 4 microns (4000 and above), you can use medium powder initially if the stone is quite uneven, to scrape it, but then use fine powder to re-lap it.
Normally only fine powder is needed.
* Be sure to wash the plate and sharpening stone well each time you change to a different type of powder.
* If you apply a rough finish to the surface of a sharpening stone of less than 4 microns (4000 or above), you will not be able to harness the stone's full potential, and will be unable to give your blades their intended finish.
Always lap such a stone with a fine powder at the end, to produce a mirror-like finish, before you start sharpening.
* Fine powders are sold separately.
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.