Drill Construction: A twist drill is made up of three components: – Shank. – Body. – Drill point Drill Nomenclature- Flute Construction. Drill Nomenclature- Flute. The principal parts of a twist drill are the body, the shank, and the point (fig. ). The dead center of a drill is the sharp edge at the extreme tip end of the drill. ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing.

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The most common type used for field and maintenance shop work is the high-speed steel twist drill because of its low cost.

Figure Twist drill nomenclature.

Helical grooves are cut on the body twist drill nomenclature the drill. It is the sharpened end of the drill. The drill gage Figure is used to check the diameter size of a twist drill.

Twist drills can also be classified by the diameter and length of the shank and by the length of the fluted portion of the twist drill. The chisel edge acts as a chisel when the drill is twist drill nomenclature and cuts nomenvlature the workpiece.

The chisel edge is the point at which the two lips meet.

Twist Drill Nomenclature/ Parts of a Twist Drill

The obtuse angle included between the chisel edge and the lip as viewed from the end of the drill. The alignment twist drill nomenclature the drill is maintained by the land. It is important to twist drill nomenclature the parts of the twist drill for proper identification and sharpening Figure Saturday, 28 July The tang fits the slot in the innermost end of the drill spindle, drill chuck, or other drill holding device and aids in driving the tool. It ensures a positive drive of the drill.


Common twist drill sizes range from twist drill nomenclature. Special drills are needed for some applications that a normal general purpose drill cannot accomplish quickly or accurately. These holes can be numbered, lettered, fractional, or metric-sized twist drills. The chisel edge must always be centered exactly on the drill’s axis for accurate cutting action. The cutting edge lips cut like knives when fed and rotated into the workpiece.

The body is the part of the drill that is fluted and relieved. This is the angle included between the two lips projected upon a plane parallel to the drill axis and parallel twist drill nomenclature the two cutting lips. This twist drill nomenclature is necessary to keep the heel from rubbing the bottom of the hole being drilled. Rubbing would prevent the drill from cutting. The grooves in the body of the drill are known as flutes.

The angle is normally measured at the periphery of the drill. The amount of slope given to the heel in back of the drill lips is called lip clearance. The shank is the part that fits into the holding device, whether it is a straight shank or a tapered shank.

The twist drill nomenclature or rake angle is the angle formed by the leading edge of the land with a plane having the axis of the drill. Twist drill nomenclature Used in a Drilling Machine. It is the longitudinal centerline of the drill running through the centres of the tang and the chisel edge. Add Comment Cancel reply You must be logged in to post a comment. Special drills can be twist drill type, straight fluted type, or special fluted.


The margin is the narrow surface along the flutes that determines the size of the drill and keeps the drill aligned. The cutting end of the drill is placed into the hole to check twist drill nomenclature size.

Twist Drill Nomenclature/ Parts of a Twist Drill | Mecholic

The angle formed by the flank and a plane at right angles to the drill axis. The shank of the drill can be fitted directly nomenlature the spindle or by a tool holding device. Letter size twist drill nomenclature drills range from A 0. Both lips should be at the same tdist of inclination with the axis 59?? The web of the drill is the metal section separating the flutes.

You must be logged in to post a comment. Sawing Machines Chapter 8. Twist drill nomenclature drill must rotate evenly about the axis at all times.

The narrowed end of the tapered shank drill is called the twist drill nomenclature. It is the part of the drill by which it twist drill nomenclature held and driven. It is the part of the drill, which is diametrically undercut between the nomenvlature and the shank of the drill.

The shank may be straight or taper.