TAILIEUCHUNG - Cutting Tools P11b

Screw threads have many dimensions. It is important in modern manufacturing to have a working knowledge of screw thread terminology. A ‘righthand thread’ is a screw thread that requires right-hand or clockwise rotation to tighten it. A ‘left-hand thread’ is a screw thread that requires Types of Taps hand or counterclockwise rotation to Taps are manufactured in many tighten it. ‘Thread fit’ is the range of sizes, styles and types. Figure tightness or looseness between extershows some of the taps discussed benal and internal mating threads. low. ‘Thread series’ are groups of diameter Hand Taps: Today the hand. | Chap. 15 Saws and Sawing automated tapping operation is shown in Figure . Tap Nomenclature Screw threads have many dimensions. It is important in modern manufacturing to have a working knowledge of screw thread terminology. A righthand thread is a screw thread that requires right-hand or clockwise rotation to tighten it. A left-hand thread is a screw thread that requires lefthand or counterclockwise rotation to tighten it. Thread fit is the range of tightness or looseness between external and internal mating threads. Thread series are groups of diameter and pitch combinations that are distinguished from each other by the number of threads per inch applied to a specific diameter. The two common thread series used in industry are the coarse and fine series specified as UNC and UNF. Tap nomenclature is shown in Figure . Chamfer Chamfer is the tapering of the threads at the front end of each land of a chaser tap or die by cutting away and relieving the crest of the first few teeth to distribute the cutting action over several teeth. Crest Crest is the surface of the thread which joins the flanks of the thread and is farthest from the cylinder or cone from which the thread projects. Flank Flank is the part of a helical thread surface which connects the crest and the root and which is theoretically a straight line in an axial plane section. Flute Flute is the longitudinal channel formed in a tap to create cutting edges on the thread profile and to provide chip spaces and cutting fluid passage. Hook Angle The hook angle is the angle of inclination of a concave face usually specified either as chordal hook or tangential hook . Land The land is one of the threaded sections between the flutes of a tap. Lead of Thread The lead of thread is the distance a screw thread advances axially in one complete turn. On a single start tap the lead and pitch are identical. On a multiple start tap the lead is the multiple of the pitch. Major Diameter This is the diameter of

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