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What Angle Is This Knife Sharpened At?

Started by cbwx34, April 06, 2018, 11:35:20 PM

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What angle (per side) is the knife sharpened at?

12.5°
1 (12.5%)
19°
1 (12.5%)
22°
2 (25%)
25°
1 (12.5%)
28°
2 (25%)
31°
0 (0%)
Other...
1 (12.5%)

Total Members Voted: 8

Voting closed: June 05, 2018, 11:35:20 PM

cbwx34

The pictured knife has a side taper of 3° per side. 

The Angle Master, sitting on the taper area, reads 25°. 

What angle (per side) is the knife sharpened at?  ???

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Fedor



cbwx34

Quote from: Fedor on April 07, 2018, 10:03:25 AM
Is it a matter of holding a quiz? A question on wits?
If you need an exact answer, it's best to use:


Thanks for the reply.  Just a "thought provoking" quiz.  (No question of "wits", answers can be anonymous). ;)

Good thoughts though!
Knife Sharpening Angle Calculator:
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SharpenADullWitt

Try the OUTSIDE of the anglemaster.  What angle does it fit, divide in half.
Favorite line, from a post here:
Quote from: Rob on February 24, 2013, 06:11:44 PM
8)

Yeah you know Tormek have reached sharpening nirvana when you get a prosthetic hand as part of the standard package :/)

cbwx34

Quote from: SharpenADullWitt on April 07, 2018, 06:43:17 PM
Try the OUTSIDE of the anglemaster.  What angle does it fit, divide in half.

The answer is in the question... no measuring needed.  ;)
Knife Sharpening Angle Calculator:
Calcapp Calculator-works on any platform.
(or Click HERE to see other calculators available)

bisonbladesharpening

I look at it just like a secondary bevel, so 22 plus 3 =25 from the spine of the knife.
Sharpening angle should be 22.



SharpenADullWitt

Quote from: cbwx34 on April 07, 2018, 06:55:40 PM
Quote from: SharpenADullWitt on April 07, 2018, 06:43:17 PM
Try the OUTSIDE of the anglemaster.  What angle does it fit, divide in half.

The answer is in the question... no measuring needed.  ;)
No, no measuring needed, because it is already set.  That doesn't mean I don't think some future reader will get the idea this is the way you are supposed to use it. ;)
Favorite line, from a post here:
Quote from: Rob on February 24, 2013, 06:11:44 PM
8)

Yeah you know Tormek have reached sharpening nirvana when you get a prosthetic hand as part of the standard package :/)

cbwx34

#8
Quote from: SharpenADullWitt on April 07, 2018, 08:08:33 PM
Quote from: cbwx34 on April 07, 2018, 06:55:40 PM
Quote from: SharpenADullWitt on April 07, 2018, 06:43:17 PM
Try the OUTSIDE of the anglemaster.  What angle does it fit, divide in half.

The answer is in the question... no measuring needed.  ;)
No, no measuring needed, because it is already set.  That doesn't mean I don't think some future reader will get the idea this is the way you are supposed to use it. ;)

Not sure I understand your thinking... measuring the angle on the side of the Angle Master, won't tell you what angle you're sharpening at.

Edit to add:  I might understand the disconnect here... I'm just looking for... what angle is the knife being sharpened at (before sharpening), not seeing what it is after it's done.
Knife Sharpening Angle Calculator:
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Fernando


cbwx34

#10
The answer....

The AngleMaster, if used according to the manual, sets the angle being sharpened based on the area above the bevel, as seen in the Tormek Handbook...


... however this assumes a flat surface above the bevel...



...to correctly set the sharpening angle.  Most knives however, as shown in the original question, have a "secondary grind" that is also angled, throwing off the AngleMaster...



... so if you want to sharpen the knife at 25dps, you set the angle at 28°...



... and if the AngleMaster is kept at 25°, the sharpening angle is actually 22°...



So, the answer in this example was 22°. :)

Thanks for playing!  :D

My next poll may be... do you like polls? ::)
Knife Sharpening Angle Calculator:
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WolfY

If measuring on the Primary bevel, e.g the blade and it is not straight but have an angle like in your case, I deduct the degrs from the reading like you did. I don't measure it so precisely but know that for kitchen knives it is normally about 1.5dgrs/ side.
Exactly like explains in the Tormek bible + self thinking/ understanding  :P
Giving an advice is easy.
Accepting an advice is good.
Knowing which advice is worth adopting and which not, is a virtue.

wootz

#12
@cbwx34 - as much as the upper side of the blade "throws off" the angle by 3 degrees, the other side does the same in the opposite direction, and in the end you get on your edge what the AngleMaster shows, don't you?

cbwx34

Quote from: wootz on June 06, 2018, 01:06:03 PM
@cbwx34 - as much as the upper side of the blade "throws off" the angle by 3 degrees, the other side does the same in the opposite direction, and in the end you get on your edge what the AngleMaster shows, don't you?

If the AngleMaster was being placed directly on the bevel being sharpened, as seen in the top photo...



... you would be correct.  But when it's placed on the secondary bevel, as in the bottom of the photo, and that bevel has an angle... it effects the reading, but doesn't "cancel out".

BTW... that is one advantage of using something like your calculator... it measures the "true" angle, and you don't have to deal with this. ;)

Quote from: WolfY on June 06, 2018, 11:50:53 AM
If measuring on the Primary bevel, e.g the blade and it is not straight but have an angle like in your case, I deduct the degrs from the reading like you did. I don't measure it so precisely but know that for kitchen knives it is normally about 1.5dgrs/ side.
Exactly like explains in the Tormek bible + self thinking/ understanding  :P

Yea... a good "rule of thumb"... a degree or two for kitchen knives, 3-4 degrees will cover most pocket style knives, etc.
Knife Sharpening Angle Calculator:
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cbwx34

#14
Quote from: cbwx34 on June 06, 2018, 03:00:56 PM
BTW... that is one advantage of using something like your calculator... it measures the "true" angle, and you don't have to deal with this. ;)

In fact, I'll expand on this a bit...

I took a knife that had a decent secondary bevel, measured the dimensions, and calculated it with a "Triangle Calculator"...




... this came out to around 11.5°, so about 6° per side.

I then set the angle using the "Knifegrinders Calculator" to 20° per side...



Now comparing it with the AngleMaster set at 20°...



vs. setting it to "correct" for the secondary bevel at 26°...



shows the adjustment that is needed.

p.s.  Don't confuse it with measuring directly to the primary bevel(edge angle in the Tormek manual)...



... that would be set to the total angle being sharpened = 40°
Knife Sharpening Angle Calculator:
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(or Click HERE to see other calculators available)