In this first of three videos, I review the Nubatama 400 grit stone in the Bamboo series. I also introduce a technique where the stone is held at an angle and the knife is held horizontally during sharpening. I also demonstrate sharpening strokes both perpendicular to the stone and full edge training and leading sweeps of the stone going from the heel to the tip of the knife.
The stone is porous and would have benefited from a 5 minute soaking initially. This is an introduction, so I did learn a bit on this first pass with the stone. This stone took three videos to review and so far has been my most difficult stone to review.
I begin by doing a tip repair, which goes considerably slower than the repair I performed on the 60 grit Nubatama. I use the side of the stone rather than the main face of the stone as this causes less wear on the front surface of the stone since tip repair doesn't require a flat surface as much as sharpening does. I actually 'catch' the tip on the side of the stone, further emphasizing that using the side of the stone keeps the front of the stone in good condition.
I then go on to begin establishing an initial edge on this Glestain Gyuto knife. This Japanese knife uses a Swedish stainless steel, something I'll comment on more in the next two videos. The knife is duller than expected, so I never accomplish this and mention at the end of the video that I will go down to a coarser stone and come back to finish the job on this stone. While I could have accomplished it, I feel that spending too much time on a stone is an indication to switch to a coarser stone to accomplish the work more quickly.
I'll also note that this heavier stone plus my exerting a bit more pressure than usual caused the stone to rock in the holder, partially defeating the purpose of holding the stone at an angle, in effect giving a more convex edge profile. Certainly not my best video and I continue in two more videos to explore this stone further to find it's virtues (which I do), so (hint) watch all three.