Turning inserts are manufactured in a variety of shapes, sizes and thicknesses. The shape can be round to maximize edge strength, diamond-shaped to allow a sharp point to cut fine features, square, or even octagonal to increase the number of separate edges that can be applied as one edge after another wears out.
diamond 80deg and trigon 80deg type turning inserts are often used for rough machining due to their larger point angle, which makes them more rigid. Inserts with a smaller point angle, such as adiamond 55deg nd diamond 35deg, are often used for finish machining.
