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What's the edge bevel angle?
- Thread starter DGG
- Start date
Cliff Stamp
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- Oct 5, 1998
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- 17,562
Generally really low, about 20 degrees included.
-Cliff
-Cliff
The Spyderco serrations are essentially chisle ground. Joyce answered this question maybe a year ago with the angles that they are aiming for on the Spyderco forum where I know you are also a member, but I have forgotten the numbers. You can do a search over there, but it is probably quite tedious.
- Joined
- Oct 3, 1998
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- 4,842
Plus the fact that each little scallop is curved.
Mr. Talmadge, sir.
Can you tell me again the benefit of the curved edge inside the serration? Is it because many different cutting angles are presented to the item being cut? I searched the Spyderco forum and came up with many serrated threads but nothing jumped out about the actual bevel angles of the individual serrations.
Can you tell me again the benefit of the curved edge inside the serration? Is it because many different cutting angles are presented to the item being cut? I searched the Spyderco forum and came up with many serrated threads but nothing jumped out about the actual bevel angles of the individual serrations.
DGG
Took a while till I found it but here is the thread:
http://spyderco.com/forums/showthread.php?t=13950&highlight=police+angle
For the angle of the serrations, you have to realize that they are sharpened only on one side. So the included angle is 18 deg for the serrations + what ever the angle of the saber grind on the other side is. Should come out to roughly 25 deg. included.
Took a while till I found it but here is the thread:
http://spyderco.com/forums/showthread.php?t=13950&highlight=police+angle
For the angle of the serrations, you have to realize that they are sharpened only on one side. So the included angle is 18 deg for the serrations + what ever the angle of the saber grind on the other side is. Should come out to roughly 25 deg. included.
HoB said:DGG
Took a while till I found it but here is the thread:
http://spyderco.com/forums/showthread.php?t=13950&highlight=police+angle
For the angle of the serrations, you have to realize that they are sharpened only on one side. So the included angle is 18 deg for the serrations + what ever the angle of the saber grind on the other side is. Should come out to roughly 25 deg. included.
HoB -
Tanks! You are better at searching than I am.
Wow! 6-8 degrees chisel ground in the serrations is very acute. Even if I use a 15 or 20 degree primary bevel on the opposing side which is what I do when I sharpen serrated knives my total included angle is quite low at 20-30 degrees.
And they use a saber hollow-ground which makes the cutting even easier once started.
What was Joe T. referring to about the curves of the serrations being a big asset in cuttinhg? Any idea? He lost me.
How do you figure 6-8 deg for the serrations? The thread that I linked to says around 18 deg!
The curvature of the scallop has two advantages: It increases the effective cutting edge. It folds the cutting edge so to speak so you can have 4" of cutting edge on a 3" blade. Also, the points of the serrations take the maximum load and protect the inside of scallops. a) you generate more pressure on the points, b) the inside of the scallops stays sharp longer.
The curvature of the scallop has two advantages: It increases the effective cutting edge. It folds the cutting edge so to speak so you can have 4" of cutting edge on a 3" blade. Also, the points of the serrations take the maximum load and protect the inside of scallops. a) you generate more pressure on the points, b) the inside of the scallops stays sharp longer.
Cliff Stamp
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- Oct 5, 1998
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The main advantage cutting wise is the angle, take any knife an grind it down to 8-10 degrees per side and compare it to a serrated blade on ropes and the serrations no longer have a massive advantage. In fact if you sharpen the straight edge well it can outperform the serrated blades. Spyderco's serrations are very fluid on hemp, on a two inch draw they usually make cuts in about 8 (1) lbs, however I have many plain edge blades that can do it in about 4. The advantage to serrations is the much longer edge retention and edge durability for reasons Hob noted.
-Cliff
-Cliff