Bevel pic

The first one looks nearly perfect, the second one, well, that's why I always do full flat or blended grinds. What kind of machine are you grinding on? I have a HF 1x30 and it seems im constantly having to fiddle with it to keep it from wobbling or scooting around or the platen flexing or other stuff like that.

It will come with time though. What I've heard people say is to lock your arms into your body and move your whole torso side to side rather than trying to move the knife with your hands/arms. It helps you move smoother, like a flywheel on a motor.
 
assuming the steel is flat and parallel and the edge thickness is consistent from ricasso to tip

In the first pic you are grinding a constant angle. A constant angle from one end to the other will follow the edge like that one does (roughly speaking, the bevel is rounded where the edge has a sharp bend, likely the edge is a bit thick at that bend).

In the second pic you have ground a variable bevel angle. The bevel is straight from one end to the other. This happens when you grind a steeper angle at the narrowing tip than the angle you started at the ricasso.

If the top assumptions aren't true, then the cause becomes harder to diagnose from those two pictures. If the steel is warped slightly and the edge is consistent thickness, then the top of the bevel will invariably change.
 
kuraki said:
assuming the steel is flat and parallel and the edge thickness is consistent from ricasso to tip

In the first pic you are grinding a constant angle. A constant angle from one end to the other will follow the edge like that one does (roughly speaking, the bevel is rounded where the edge has a sharp bend, likely the edge is a bit thick at that bend).

In the second pic you have ground a variable bevel angle. The bevel is straight from one end to the other. This happens when you grind a steeper angle at the narrowing tip than the angle you started at the ricasso.

If the top assumptions aren't true, then the cause becomes harder to diagnose from those two pictures. If the steel is warped slightly and the edge is consistent thickness, then the top of the bevel will invariably change.
Click to expand...
Okay, so I'm not staying steady in the second pic? Thank you
 
Not exactly. Both sides look good, depending on what you are intending to do. If you want the second pic to look more like the first, you need to maintain the same bevel angle. You get what happens in the second when you start angling the blade into the belt more at the tip. Which isn't "wrong." Some knives you will want to do that to maintain thickness at the tip. But if you just want to get both sides the same, make sure you're not changing the angle you're holding it.
 
So to follow the curve, do i maintain same angle and pull away from the platten as I get close to the tip
 
Sharpe5097 said:
So to follow the curve, do i maintain same angle and pull away from the platten as I get close to the tip
Click to expand...

I've seen people try and rotate the knife, and this might be better for some special things, I don't know, but on a normal knife it's a lot harder to do and you end up with the same end result as pulling away.

In short: Yes.
 
You must log in or register to reply here.
Back
Top