Drill bit nomenclature download

This is the portion of the flute surface adjacent to the lip. The chip impinges on it. The edge which is formed by the intersection of the flute surface and the body clearance is known as heel. It is the angle between the cutting edges. It is generally degree. Its value depends upon the hardness of the work piece to be drilled. For harder material, larger angles are used. It is the angle between the face and the line parallel to the drill axis. At the periphery of the drill, it is equal to the helix angle.

It is the angle between the leading edge of the land and the axis of the drill. It is also called as spiral angle. It is the angle formed by the portion of the flank adjacent to the land and a plane at right angles to the drill axis measured at the periphery of the drill.

It is the obtuse angle between the chisel edge and the lip. Generally, this angle is and degree. The length of the flute is represented by the depth of the hole, the length of the bush, and the amount of regrinding allowance. It is vital to keep it to a bare minimum as much as feasible. This kind of flank has a conical form, as illustrated in the diagram, and the clearance angle increases as the drill moves toward the centre of the hole. It is referred to as the all-purpose drill bit. As seen in the illustration, this form of flank has a flat contour.

Grinding is a simple method of creating this sort of drill bit. It is mostly used in the production of tiny diameter drills. A specific grinding machine is necessitated for machining of this sort of flank, since it has three angles on each side. Surface grinding is carried out on three sides in this instance. Because there are no chisel edges, there is a strong centripetal force and a minor hole oversize as a consequence of this.

Drilling procedures requiring a great hole precision as well as precise placement are the primary applications for this drill bit. These unique drilling bits are used for drilling operations that need exceptional precision.

The chisel edge generates a large amount of centripetal force while maintaining good machining precision. In order to machine this unusual helix angle cutting edge, conical grinding is used.

This procedure raises the clearance angle at the centre of the drill, which is important for drilling. This kind of flank has a radial cutting edge that has been honed to spread the machining loads.

Cast iron, aluminium alloy, and steel plates are among the materials on which these drill bits are most often used because of their high machining precision and excellent surface polish. The radial lip in the cutting tool is created with the help of a specialised grinding machine. This kind of flank has a two-stage point angle geometry, which allows for improved concentricity and a decrease in shock vibration when the tool retracts. Thin sheet drilling activities are carried out with the help of this kind of drill bit.

Tags: Chisel edge angle of a drill tool Chisel edge of a drill tool Cutting edge of a drill tool Drill Tool Nomenclature Helix angle of a drill tool Lip clearance angle of a drill tool margine of a drill tool. Parts of a Drill Tool Point angle of a drill tool shank of a drill tool.

Expand Menu. The body consisting of the cutting edges, and The shank used for holding purposes. A pressure vessel is defined as a container with a pressure Knuckle Joint A knuckle joint is used to connect two rods which are under the action of tensile loads.

However, if the joint is guided, the rods may support a compressive load. A knuckle joint Skip to content Home - Blog - Machine Shop. Table of Contents. Drilling is the process of cutting or originating a round hole from the solid material.

There are many ways of classifying drills. The tool drill and not the work piece is revolved and is fed into the material along its axis.

For example , according to material, number and types of flutes, drill size , type of shank straight or taper and cutting point geometry etc. However the most common type of drill is the fluted drill shown in figure. Drill Construction: Drill Construction: A twist drill is made up of three components: A twist drill is made up of three components:. It is the portion of the drill by which it is clamped in the spindle.

The shank may be either straight or tapered. Straight shank drills are used with a chuck. Tapered shank drills have self-holding tapes that fit directly into the drill press spindle. On the taper shank is the another term is used which is called tang.

This fits into a slot in the spindles sleeve. It is the portion between the point and the shank. Cutting Diameter:. Back Taper —. Back taper provides clearance between the drill and workpiece preventing friction and heat.