scandi grind height.

jdm61

jdm61

itinerant metal pounder
Joined
Aug 12, 2005
Messages
47,357
I am looking to try a scandi grind for the first time, How high would you take it on .103 thickness steel?
 
Are you wanting a chisel grind or a standard grind? Either way the numbers are the same for an 11° Scandi.

11° grind @ .103 thickness = .530 grind height

I thought I would add how you solve this.

Grind height = Adjacent on right angle
Blade thickness = opposite on right angle


So Adjacent =opposite / tan(°)

Adjacent = .103 / tan11°
Adjacent= .103/.1944
Adjacent= .52983

Grind height = .530

So I hope this helps others calculate there grind height. The above numbers are for 11° but if you are after a different angle then replace the 11 with your number.
 
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JTKnives: I think you forgot to divide the thickness by 2, since the blade is being ground on both sides.

Chris
 
Does not really matter 11° is 11°. But just to prove it I will do the math.

.103 blade thickness devide by 2 = .0515

.0515/tan5.5° = .0515/.096289= .5348

So it's littery a hair different between the 2 nothing a knife maker is going to notice in a grind height.
 
JTknives said:
Are you wanting a chisel grind or a standard grind? Either way the numbers are the same for an 11° Scandi.

11° grind @ .103 thickness = .530 grind height

I thought I would add how you solve this.

Grind height = Adjacent on right angle
Blade thickness = Hypotenuse on right angle


So Adjacent = Hypotenuse / tan(°)

Adjacent = .103 / tan11°
Adjacent= .103/.1944
Adjacent= .52983

Grind height = .530

So I hope this helps others calculate there grind height. The above numbers are for 11° but if you are after a different angle then replace the 11 with your number.
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tangent is opposite/adjacent not hypotenuse over adjacent.

On a chisel grind you can make a right angle with the with as opposite and the grind height as measured along the bevel as hypotenuse and use sine for the angle (or if you want the perpendicular hight along the non beveled edge use tangent)

On a a normal V bevel you (hopefully) have an isosceles triangle the the height along the bevel will be the hypotenuse, half the blade thickness would be the opposite side (your angle in this case would be for only 1 side though not an inclusive angle)
 
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Sorry that was a miss print, I ment opposite
 
NC Biker said:
Just busting JT's balls with my Saturday night, had too many drinks, wishing I was at blade sense of humor.
Click to expand...

I hear that. I went last year for the first time. I didn't even see close to everything I wanted to. Maybe next year...
 
I for one would love for makers to quit stating the angle in a "per side" format. The apex of an angle is one number ... not two halves of that number. I would hope that most people would then know what to do with that angle is performing tasks where the angle may need to be divided. Sadly, too many of todays youth want all the numbers feed to them, an "app" for determining angles and such, and jigs to do the work for them. This leaves them helpless to do it in their head or figure it out themselves.
 
Stacy E. Apelt - Bladesmith said:
Sadly, too many of todays youth want all the numbers feed to them, an "app" for determining angles and such, and jigs to do the work for them. This leaves them helpless to do it in their head or figure it out themselves.
Click to expand...

The is pretty funny considering all the "non" youth knifemakers who want the same information lol

Considering how many top knifemakers are using CNC and grinding jigs to make blades you can hardly fault the new maker following their example.

At least they are not buying knife kits and putting their names on them.
 
I was a history major. A simple number in millimeters or fractions of an inch would be fine, thank you very much. :D
 
Lo/Rez said:
I'm 51 years young and use a jig and the blade angle grind chart.
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There's absolutely nothing wrong with that. The end result is what matters. If a jig and a chart get you there, you're doing it right. :thumbup:
 
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