FABRICATION & MACHINING OF TURN BUCKLE

BYADITTYA CHAKRABORTY

UNDER THE GUIDANCE OF SUDIPTA GHOSH(SUR)

A PROJECT REPORTSubmitted In Partial Fulfillment of the Requirements

For The Diploma InMechanical Engineering

DEPARTMENT OF MECHANICAL ENGINEERINGKINGSTON POLYTECHNIC COLLEGE, BERUNANPUKURIA, P.O- MALIKAPUR,

BARASAT, 24 PGS (N), KOLKATA - 700126

PROJECT ON FABRICATION AND MACHINING OF

TURNBUCKLE

PROJECT ON FABRICATION AND MACHINING OF TURNBUCKLE

To know the viability of manufacturing machining of turnbuckle

To know how to manufacture turnbuckle

To know the fabrication process of turnbuckle

To know the precautions for the manufacturing of turnbuckle

OBJECTIVE

SOURAV DUTTA VASWATI SAHA INDRAJIT SENGUPTA ADITTYA CHAKRABORTY ANKAN ACHARYA SAMANNWAY SENGUPTA KOUSHIK ROY BAPON MONDAL SUBHAMOY NASKAR KARTICK CHANDRA PATRA

Acknowledgement

Turnbuckles are most commonly used in applications which require a great deal of tension; they can range in mass from about ten grams for thin cable used in a garden fence, to thousands of kilograms for structural elements in buildings and suspension bridges

Turnbuckles are used for tensioning a ship’s rigging and lashings. This device is also known as a bottle screw in this context.

FUNCTION

They are widely used in aircraft, on flexible cables in flight control systems. They are secured with lock wire or specifically designed wire clips to prevent them from turning and losing tension.

Another application of this instrument is in shipping; here they are used for tensioning a ship’s rigging and lashings. This device is also known as bottle screw in this context.

Turnbuckles also find a popular use for tensioning the ropes in professional wrestling rings and boxing rings, where they serve as the attachment between the ring ropes and ring posts. The turnbuckles come into particular play in professional wrestling where they are often put to use by participants as part of their offensive repertoire.

TYPES OF TURNBUCKLE

Turnbuckle with eyes

A turnbuckle, stretching screw or bottle screw is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one with a left hand thread and the other with a right hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables.

A metal coupling device consisting of an oblong piece internally threaded at both ends into which the corresponding sections of two threaded rods are screwed in order to form a unit that can be adjusted for tension or length.

LITERATURE REVIEW

A device for tightening a rod or wire rope. Its parts are a sleeve with a screwed connection at one end and a swivel at the other or, more commonly, a sleeve with screwed connections of opposite hands (left and right) at each end so that by turning the sleeve, the connected parts will be drawn together, taking up slack and producing tension (see illustration). Types of ends are hook, eye, and clevis. The turn-buckle can be connected at any convenient place in the rod or rope, and several may be used in series if required.

DESIGN OF TURNBUCKLE

Applying 3mm feed to remove the outer layer of metal in order to decrease the diameter from 44mm to 32mm as per diagram by turning process. This is done on two 44 diameter rods, i.e. 2 small rods.

SEQUENCE OF OPERATION

Now threading was done on these 2 small 32 mm jobs up to 72mm in length. A right hand thread and a left hand thread were done on these 2 jobs. At the end of 72 mm we created a depression of 5mm diameter as well

Using turning we also remove the outer layer of the

Now we drill a hole by using 27 drill bit and 28

bore bit. While drilling we reduce the speed of the lathe but while boring we increase the speed of the lathe

. A 55mm thread is done on both sides of the big job.

After creating a hole with 55 mm threads, we created a sort of uplift on the big job, by lathe machine.

Now we applied a hex poll on either sides of the job of 32 mm each of 1 inches

Using suitable lubricant we check the fitting of the turnbuckle.

The making of a simple turnbuckle is successful and ready for industrial use.

Turnbuckles may be used for straight or in-line pulling only. Special attention should be paid to prevent overloading. While tensioning, the forces on the turnbuckle must not be such that any deformation occurs. In case of deformation, the tension should be decreased immediately and deformed parts should be replaced.

It is required that the products are regularly inspected and that the inspection should take place in accordance with the safety standards given in the country of use. This is required because the products in use may be affected by wear, misuse, overloading etc. with a consequence of deformation and alteration of the steel structure

INSTRUCTIONS FOR USE

Cost of 14kg of EN8 STEEL @Rs. 47/kg……Rs 660

Metal cutting charges…………………Rs 150

Cost of Turning, Drilling, Boring, Thread cutting & Tapping(4-5 hours operation)……………..Rs. 1000

Grinding……………………………Rs. 300

Overheads like electricity, labour cost,….Rs 1000

Total manufacturing cost………Rs. 3110

ESTIMATING & COSTING

The threads of the body and the end fittings are of the same type

The threads of the body and the end fittings are undamaged

The body and the end fittings are not distorted or unduly worn

The body and end fittings are free from nicks, gouges and cracks.

SAFE USE OF TURNBUCKLES