threads&threaded joints_2007-08

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Information about threads&threaded joints_2007-08

Published on March 12, 2014

Author: ramesh.uddagiri


PowerPoint Presentation: Threads- Terminology in threads- External thread- PowerPoint Presentation: Internal threads PowerPoint Presentation: Different Types of Thread profiles:- Square Threads. V-threads. ACME Threads Buttress Threads. Whitworth threads Thread Conventions PowerPoint Presentation: Square Threads V- threads PowerPoint Presentation: ACME threads Buttress threads PowerPoint Presentation: Whitworth Threads PowerPoint Presentation: STANDARD REPRESENTATION OF THREADS Visible screw threads - For visible screw threads, the crests of threads should be defined by a continuous thick line (type A), and the roots of threads by a continuous thin line (type B). Hidden screw threads - For hidden screw threads, the crests and the roots should be defined by dashed lines. Sections of threaded parts – For threaded parts shown in section, hatching should be extended to the line defining the crest of the thread. PowerPoint Presentation: End view of screw threads - On an end view of a visible screw thread, the thread roots should be represented by a portion of a circle, drawn with a continuous thin line (type B), of length approximately three-quarters of the circumference. The above conventions apply to assemblies of threaded parts. However, externally threaded parts should always be shown covering internally threaded parts and should not hidden by them PowerPoint Presentation: METRIC THREAD STANDARDS PowerPoint Presentation: UNIFIED THREAD STANDARDS PowerPoint Presentation: Hexagonal headed bolt Square headed bolt Generally used when the head is to be accommodated in recess. Recess is also made up of square shape to prevent rotation of bolt. Square neck to avoid rotation of Bolt while tightening a nut. PowerPoint Presentation: Cylindrical or cheese headed bolt Used when- Space for accommodating bolt head is less. Use of spanner is to be avoided. Rotation of bolt is prevented by means of a pin T- headed bolt Primarily used in machine tool tables. Fits in T slot provided on them. PowerPoint Presentation: Counter sunk headed bolt. Used in application where head of bolt must not project above the surface of connected piece. It may provided with the neck of square cross-section. Hook Bolt This bolt passes through a hole of one piece only. other piece is gripped by the hook shaped bolt head. This is used when it is not possible to drill hole in the piece adjoining bolt head. PowerPoint Presentation: Eye Bolt- Bolt has circular ring as its head. Used as an appliance to lift heavy machines. Stud- It consists of a cylindrical shank threaded at both sides. The nut end N is threaded for a length slightly More than thickness of nut. Metal end M is threaded to length at least equal To diameter of stud. PowerPoint Presentation: Washer Fitting of stud PowerPoint Presentation: Hexagonal nut Drawing a hexagonal nut Approx Std. Dimensions T=D; W=1.5D+3mm; R=1.4D Rough Rule Dimensions T=D; R=1.5D Distance across diagonally opposite corners: 2D PowerPoint Presentation: Nuts Tommy Bar / Pin spanner PowerPoint Presentation: Locking arrangements for nuts Due to vibrations, there is always a tendency to for nuts to get slack. The nut A is first screwed on bolt as tightly as possible. The nut B is then screwed on the bolt till it touches the top of nut A. The nut B is help by spanner and nut A is turned backwards through few degrees. The two nuts are hence locked tightly due to wedging action against each other and bolt. Nut B carries all the load, hence it is made thicker than nut A. Generally nut A thickness is kept 0.8 times of thickness of nut B PowerPoint Presentation: Molten Lead / sulphur Foundation bolts PowerPoint Presentation: Foundation bolts PowerPoint Presentation: Bolt type Picture Application Square headed Bearings of shaft Cylindrical headed Big end of connecting rods, eccentrics, etc. T-headed Machine tool tables, boiler mountings such as stop valve, feed check valve etc. Counter-sunk headed Where the bolt head must not project above surface Eye bolt For lifting heavy machines Stud Connect cylinder cover to engine cylinder Situations where there is no space for bolt heads PowerPoint Presentation: END!!

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