How do you sand like this? Curvy blade, straight sanding lines (Neil Blackwood stuff)

[Don Nguyen]

Neil Blackwood makes tons of these knives, and many of them have similar finished that go straight down the blade, while being very curvy. I tried asking him for tips but haven't got a reply. I asked a couple of people around here too, and got a general idea on how it works, but doing it is a whole different schepwal.

I'm stumped.

 

[Fellhoelter]

Which part of it is confusing?
Perhaps we can help clarify.

Knife goes in vise/holder, with the tip pointed at you.
Put paper on your sanding block/pad.
Start at plunge, pull straight back towards tip.
Rinse, repeat...

 

[Don Nguyen]

I had another picture linked but it didn't show; now it should...

I guess my problem is that the angle of the bevel changes towards the tip, and it's confusing for my arm/hands/etc to account for that. He seems to be able to get perfect lines straight down, but mine always tend to follow the curve or mess up the sharp grind.

 

[Fellhoelter]

Neil has done it a few times...

It's practice, they get better with time.