The slope in the direction of the chisel length in which the chip moves is called the 'front rake' or 'true rake'. The angle BOC is the clearance angle which is formed by the back cutting face of the chisel and the surface of the work to be treated. Being formed between the front and back cutting faces of the chisel the angle AOB is known as the lip angle. The plane АО called the 'front cutting face' or the 'top face' is given a backward and sidewise slope for sliding the chips off the tool in a convenient direction while the plane OB is called the 'back cutting face'. 3 shows the process of chipping by means of a chisel, as well as the cutting angles. 2 shows a schemeof the process of cutting into metal,and the angles of the wedge.įig. An angle of about 70° is suitable for most work. Process of Chipping by Means of a Chisel:ġ - front cutting face 2 - front rake 3 - cutting angle 4 - back cutting face 5 - clearance angle 6 - lip angleĪngle of the chisel and vice versa.

The harder the metal, the larger should be the cuttingįig. The cutting edge of the chisel should be sharpened to an acute angle so as to provide for the best cutting ability, depending on the stock to be chipped. The work of the wedge depends mainly on its cutting angle. Under the effect of an external force applied to the wedge it cuts into the metal. A chisel is a tool made of very hard steel, having a cutting edge at one end of the blade. There are different tools used in metal-working shops for chipping stocks such as chisels.

The workpiece to be tooled is fixed during the cutting process in the bench vice. Chipping of large parts is always done on an anvil but very often it is done in a bench vice. Chipping is used in cases when it is necessary to cut off a piece of metal from sheet metal. This process is used when a large piece of metal has to be removed from a workpiece this process is very labour-consuming 1 and is applied only in cases when the workpiece cannot be machined. Chipping is a process of removing metal from a workpiece by means of a cutting instrument such as a chisel and a hammer.

Arm and hammer anvil serial numbers