- Joined
- Oct 18, 2001
- Messages
- 20,978
There are a lot of little things that go into a knife...some of which you guys may never see...even if you know what it is.
This is a classic example of such a process....hidden to end users.
Before grinding any blade, I "grind the 45s" first.
Here's the setup:
An angled tool rest against a flat platen.
This is also how I do the scandi-ground bevels....but at a much steeper angle.
First step is to grind the edge square. When steel is cut out by waterjet it has a slight angle to it and is not 90 degrees. So, I have to go back and clean up the edge and make it 90 degrees.....~80 times....adds up.
Next step is to spray the edge with blue layout fluid (Dykem) for scribing the edge. This particular steel happens to be ~0.284 thick...
....so, if I want a pre-heat-treat edge thickness of around 0.040"-0.050"....I need to scribe a line approx 0.226" from the corner of the steel...parallel to the edge...all the way from ring to tip...both sides.
You can see the red line in the pic below showing where I mark it....I actually mark 2 lines...but you can't see it very well...hence the red.
Then I start grinding one side until I reach the scribed line...flip over and do the other side.
The reason for all this extra fuss....is to ensure the edge is exactly in the center. And a wide full flat grind is a royal pain in the rear to "eyeball" or "freehand"....plus it's not very smart...no matter how good you are.
I've set the platen at an angle greater than 45...because frankly it's easier to take it off here...than by freehand. So, for me...I want to take off as much as I can...less fatigue on the hands AND the belts.
So here we are today.....a half-dozen or so down....and a whole bunch more to go. :foot:
Thanks for looking!
Dan
This is a classic example of such a process....hidden to end users.
Before grinding any blade, I "grind the 45s" first.
Here's the setup:
An angled tool rest against a flat platen.
This is also how I do the scandi-ground bevels....but at a much steeper angle.
First step is to grind the edge square. When steel is cut out by waterjet it has a slight angle to it and is not 90 degrees. So, I have to go back and clean up the edge and make it 90 degrees.....~80 times....adds up.
Next step is to spray the edge with blue layout fluid (Dykem) for scribing the edge. This particular steel happens to be ~0.284 thick...
....so, if I want a pre-heat-treat edge thickness of around 0.040"-0.050"....I need to scribe a line approx 0.226" from the corner of the steel...parallel to the edge...all the way from ring to tip...both sides.You can see the red line in the pic below showing where I mark it....I actually mark 2 lines...but you can't see it very well...hence the red.
Then I start grinding one side until I reach the scribed line...flip over and do the other side.
The reason for all this extra fuss....is to ensure the edge is exactly in the center. And a wide full flat grind is a royal pain in the rear to "eyeball" or "freehand"....plus it's not very smart...no matter how good you are.
I've set the platen at an angle greater than 45...because frankly it's easier to take it off here...than by freehand. So, for me...I want to take off as much as I can...less fatigue on the hands AND the belts.
So here we are today.....a half-dozen or so down....and a whole bunch more to go. :foot:
Thanks for looking!
Dan
