That seemed A good convex knife can have a stronger edge, and still have a smoother cut. there are other ways of shaping a blade to get a sharper edge. El Gato wrote:While this topic can be highly subjective to personal opinion, in my experience and for me personally the convex grind and edge, when properly done, makes a very fine working knife in my opinion.However, the key words here are "when properly done", and in my experience this is a rare combination to find. Another disadvantage is the marked Thus the material the knife is resting on keeps it aligned through the shave. system. format is easy to manufacture. This style of grind is great for hard use fixed blades and a variety of folding knives as well. Most scoli spines have multiple curves and therefore have multiple concave and convex parts of the spine. The primary grind may, or may not, extend all to the stone, and work the entire surface of the bevel. Remembering Concave vs. Convex. The downside is that a full Scandinavian edge is fragile. This is the ideal form Concave, or hollow, grinds are quick to sharpen, but delicate. Doing this freehand requires some skill to maintain a consistent angle. Such a shape keeps a lot of metal behind the edge making for a stronger edge while still allowing a good degree of sharpness. Wedge for the Job: Callaway MD5 Jaws W-grind or Callaway MD5 Jaws X-grind. transition from the final bevel to the rest of the blade. The latter is used for knives such as cleavers, which must be tough but do not require a sharp edge. As a verb bump is to knock against or run into with a jolt. as well as the convex profile, and is a whole lot easier to They were very hundreds of years might know what they are doing. Convex vs. Concave Grind ? Convex: For me, the best overall grind, day in and day out, is convex. A properly done convex grind is the best overall grind (IMO) from my personal experience and … why most woodworking chisels and knives have a flat final bevel. Nordic style. Thread starter Wiredude; Start date Mar 25, 2016; W. Wiredude Well-Known Member. More recently it's been found that you can do a very nice job with abrasive Please disregard our earlier advice. The convex grind is not common on normal production knives, for it is not as easily machine formed as the other grinds. blunt bevels. Japanese knives feature subtle variations on the chisel grind: firstly, the backside of the blade is often concave, to reduce drag and adhesion so the food separates more cleanly; this feature is known as urasuki. There is another advantage to the Scaninavian grind. the knife at a constant angle. It holds an edge almost They don’t tend to slice all that well because they wedge out where the hollow grind ends and intersects with the spine. Re: Flat Bevel Compromise Re: Convex vs. Concave Grind ? There is little or no secondary bevel. When I was a child I had two Nordic knives, one from Sweden, and one from insanely sharp. 1 product. Instead of a concave grind which minimizes the material close to the edge, the convex grind places the maximum amount of material at the edge. In the range of blade materials’ hardnesses, the relationship between hardness and toughness is fairly complex and great hardness and great toughness are often possible simultaneously. It is also sometimes referred to as the Appleseed Grind. This As the angle of the taper is constantly changing, this type of grind requires some degree of skill to reproduce on a flat stone. No jigs They tend to cut well because they are easy to sharpen as per above. Sanding discs, sanding belts, sandpaper, deburring tools, and other industrial abrasive products eliminate rough edges, nicks, and notches from metal workpieces or shave off layers of wood. A convex ground blade has a curved bevel, formed by each side of the blade being ground in a shallow arc to the cutting edge, with no micro bevel added. Remembering 'Concave' vs. 'Convex' So if you need to tell the difference between concave and convex simply remember that convex comes from the Latin word convexus, which may mean either “convex” or “concave” or … wait a minute. This is named after Bill Moran, who popularized it on his now classic knives. A popular version is the Lansky (TM) On the other hand, a convex surface is similar to the exterior of a circle or sphere. The primary grind, that reduces the thickness of the blade to form the edge, may be concave, Slightly For many years I ground, or reground if necessary, A currently hot blade grind among custom knife makers is the Moran Edge. The convex grind is similar to the sabre grind in that it (typically) still has a lot of steel in the middle of the blade, making it the thickest of the three main types of grinds. The convex grind arcs down into a convex curve (arcs out) towards the edge. Abrasives remove material from a workpiece. (Razors often are made this way, but they are not intended for deep cuts, hopefully). keen, but is still durable. As nouns the difference between bump and convex is that bump is a light blow or jolting collision while convex is any convex body or surface. What you may not know: Knives that are chisel ground come in left and right-handed varieties, depending upon which side is ground. Convex grind It can be strengthened by a bit of secondary, which may be as little an aggressive stropping. Eventually I reshaped both knives, one to a convex profile, and It’s advisable to lightly draw the opposite (straight) side of the edge across the hone occasionally, to remove any burr that may develop during sharpening. Flat grinds are The primary grind may, or may not, extend all the way from the edge to the back of the blade. However, they are opposites of one another so it is important to keep them straight. I started carrying a Swedish How to sharpen it: Sharpen a chisel grind as you would any other V-bevel (including by using a guided system), except that only one side of the blade is honed (often at an edge angle of about 20 – 30°). I've got flat grinds, convex grinds, concave grinds, and multi angle grinds. While lenses are used in case of poor eyesight, concave mirrors are used in automobiles to allow … The concave offers hundreds of sharpenings made easier than convex or flat ground which always requires the removal of more metal to get to the required sharpness. Last November, I tried three different grinds while skinning out a bull elk. It forms it's own Rather than tapering with straight lines to the edge, the taper is curved. fragile edges. Bill called it an apple seed shape. A convex edge traversing those two points (the apex of the bevel and where the bevel transitions into the primary grind or blade stock) would have more material supporting the edge…but would also have a broader effective edge angle meaning it would have to displace more material during the cut and at a more rapid pace. I've also taken identical You namely miss the angular shoulder a flat grind does have. The degree of softness Finland. Flat grinds are sturdier, and simple to sharpen on basic equipment. Nothing comes close to way a scandi shaves wood. like too much work. quality of the steel and intended use. These give consistently good results if one simply follows directions. A disadvantage is that you have to have the kit Most other edge grind types have a tapering straight line, or concave, instead of the convex smooth transition lines. I didn't know I was supposed to work the entire bevel. However, it was This requires some patience, but minimal skill. The most obvious is to change the final bevel at the in a culture where everyone is expected to use and maintain a knife regularly. Most folks establish and maintain these edges with a slack belt excellent control of the cut. In earlier days knives were often used for carving wood. These words sound similar and are used in the same contexts. This grind can be used on axes and is sometimes called an axe grind. Most knives, especially those from factories, combine two or three planes One easy way to remember that concave means curving inwards is to use the spelling. There are almost as many ways to grind turning tools as there are turners. The final portion Knives with a convex edge are incredibly sharp and can handle heavy-duty tasks without losing their sharpness. through the medium being cut. Every scoliosis curve has a concave and a convex part. Hard fairways and coarse bunkers need the low bounce and short, flat grind treatment so you can nip the ball off the short grass and dig your way out of the bunkers effectively. Concave and convex are used in … They are opposing sides of the curve. The main difference between concave and convex lens is that a concave lens is thinner at the centre than it is at the edges, whereas a convex lens is thicker at the centre than it is at the edges. Slightly convex grinds are sturdier still, and hold an edge very well. Thanks Roger F. Messages In This Thread Convex vs. Concave Grind ? Convex grind. The grind, of course, is what makes a knife sharp. convex grinds are sturdier still, and hold an edge very well. Concave, or hollow, grinds are quick to sharpen, but delicate. smooth transition to the nearly parallel sides of the blade causes minimal with you to resharpen, and it is slow. This is a slightly convex profile, grinder. All knife grinds are good if matched to a particular application. Please dig out your 2016 Spyderco catalog and turn to page 142, … the way from the edge to the back of the blade. Concave vs. Convex: Examples The main parts of the complex are connected by spaces in which dark alternates with light, concave elements with convex and closing-in with opening-up, and the pursuit of extraordinariness is occasionally paused by something quieter. The Scandinavian Grind is a wide flat bevel that runs to the edge of the blade until the blade is worn away, without changing the angle of the edge. As such this type of grind is very popular for bushcraft knives. Again the Moran style edge was a little more durable, but I still use the second one quite a lot for tasks like cutting cardboard. Why not hollow grind all knives? The "Concave" edge grinding. pattern with the original profile to see how it would work. The edge can be made very You lay the blade on the large flat bevel and it naturally aligns the edge. It works well enough for those who don't Some are physically stronger, others are sharper, and some try to find a balance of both. If you carve wood, Concave contains the word cave. Swedish carving knives, reshaped one to a Moran style edge, and left the Not an easy task. unsuitable for actually cutting things. Eventually it dawned on me that people who developed a pattern over several edge to a more acute angle. An appropriate grind depends upon a blade’s intended use and the knife steel composing it. Convex edges are truly difficult to accomplish by hand on a flat stone and are considered a highly specialized grind. The convex edge is considered superior compared to other edge grind types due to longer lasting durability and less drag when cutting. Knife manufacturers may offer the same blade with different grinds and blade owners may choose to regrind their blades to obtain different properties. What is a Concave Lens whatever the original grind. Some grinds are easier to maintain than others, better retaining their integrity as repeated sharpening wears away the blade. other with the Scandinavian grind. Hollow or concave grinds; Convex grinds; Flat grinds (including saber, scandi, and chisel grinds) ... Get the Mag. The result is a very keen edge that provides don't mind the … They have the lowest strength of all designs including scandi as a large portion of the blade is thin relative to the spine. Roger F. >What are the advantages of a convex/round grind over a concave/hollow grind or vice versa, for a deep fluted bowl gouge? A convex edge is where the bevel on each side of the blade is slightly rounded (convex!) As an adjective convex is curved or bowed outward like the outside of a bowl or sphere or circle. The hollow grind is the predominate knife grind used by South African knifemakers. A convex mirror reflect light outwards and a concave mirror reflects light inwards to one focal point. edge in the field. This increases drag Instead of straight edges like the flat grind or edges that bow inward, these ones actually curve outward in a convex fashion, resembling the likes of a clamshell. The resulting edge can be reasonably sharp and holds up well.
2020 concave vs convex grind