SNAFU said:
What kind of grind is on the HH? I believe my FSH and HOFSHs have a full convex grind but what is on the HH? From the below picture is it flat with convex edge like the one in the middle?
If so why the change? What are the advantages?
I've tried the search function but either its broken or I'm search capability challenged.
to be more specific on the anvantages part - from jerry-
"The grinds are so unique on the new AK-47 that we will soon have a patent pending on the process. We call it a “CC Bevel”. The CC Bevel is convex and allows us to offer the absolute accuracy and repeatability of CNC technology with greatly improved performance over traditional grinding methodologies. When compared to flat grinds or traditional hand ground convex blades out of the same material and heat treat, there is a marked increase in both strength and flexibility. The edges are taken to near “Zero” prior to coating and are left very fine for cutting soft targets. We went with a more traditional style point as opposed to what is commonly referred to as the “Americanized Tanto Tip”. The American style tip is typically stronger but greatly reduces slashing power while the more traditional tip allows for much better full length cutting performance and point penetration. With the enormous strength of an INFI foundation on this blade, we were afforded the opportunity to incorporate the better slashing tip design."
and i know, somewhere there is a qoute to be had from jerry specifically regarding convex and flat grinds on the new knives....
basically, if you take a set of knives, say the fusion steel hearts, and give each a different grind.
1 = 1/4" thickness, full flat
2 = 1/4" thickness, saber flat
3 = 1/4" thickness, full convex
4 = 5/16" thickness full flat
5 = 5/16" thickness saber flat
6 = 5/16" thickness full convex
between 1 and 4, 2 and 5, 3 and 6, the later thicker series will win out for strength, but they will also be thicker in geometry, and heavier. thicker in geometry tends to mean lower cutting performance *though a large part of this is determined by the cutting edge*, and heavier will generally mean faster fatigue rates.
but when you compare the 1 to 2, the saber will win out on the full flat for strength, but will be more obtuse in geometry and weight.
when you compare 2 to 3, the full convex grind is similar to the saber flat in strength, weight, and general performance. but by rounding out the corners of the saber grind, you get slightly better cutting geometry, and perhaps a very very slight degrees in weight. it is essentially a compromize between a full flat, and saber grind.
when you compare a 3 to 4, the difference starts to be interesting. the convex ground 1/4" will be heavy for a 1/4" knife, and the 5/16" full flat will be as light as you can make it without being hollow, so they come a little closer in general performance.
and i have now officially confused myself.
roto FSH
