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| The Folding Knife (& Switchblade) Forum The materials, techniques and the designing of folding knives. |
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#1
08-28-2005, 01:59 PM
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flat grind degree
not sure if anyone has the answer to this or if there is even a true answer......if im using 1/8 barstock to make a folder what is the ideal degree of the flat grind?
thanks, bill __________________ Cowards die many times before their deaths; the valiant never taste death but once. --Shakespeare: Julius Caesar 
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#2
08-28-2005, 04:47 PM
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I guess it would really depend on how high you go with the grind. Are you using a jig?
Jeremy
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#3
08-28-2005, 06:36 PM
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"Ideal' is a relative term, ideal for what purpose? Considering that it is a folder blade being discussed, most likely the ideal would be the thinnest wedge that could be formed by the primary grind. On any given blade of any given size, the thinnest wedge will be formed when the blade is flat ground all the way to the spine. Any grind on that same blade that doesn't reach the spine will always have a wider angle and form a wedge that is thicker than if the grind were taken to the spine. The thicker the steel is, the greater the angle will be whether ground all the way to the spine or not. The taller the blade, the smaller the angle will be for any given thickness of steel whether ground all the way to the spine or not. In other words, we largely define the angle without even thinking about it by our choice of steel thickness and the height of our blade. The angle of the secondary bevel dill do more to define the sharpness and durability of the edge than the primary grind will (although it's important too).
In any case, I don't think most makers worry much about what angle the prmary grind is. It's more about whether or not they want the blade ground all the way to the spine or not, what looks best to them, or what they think will work best for the knife's intended use.... __________________ Your question may already have been answered - try the Search button first!   
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#4
08-28-2005, 11:03 PM
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yea im giving a jig a try and i do want the grind all the way to the spine. i was hoping there was some kind of formula for that.
bill __________________ Cowards die many times before their deaths; the valiant never taste death but once. --Shakespeare: Julius Caesar
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#5
08-29-2005, 08:18 AM
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There is a formula - basic trigonometry could be used to calculate the angles. But, what i tried to explain above is that there really isn't any reason to go to the trouble of doing that because the dimensions of the blade have already determined what the angle will be. Changing the dimensions slightly would make very little difference in the angle so there is little practical reason to know what the angle is, just make the blade the size and profile and thickness that you think works well with your overall design and you'll be fine....
__________________ Your question may already have been answered - try the Search button first!
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