www.findstone.com a wonderful site

I just chanced upon this website, which has been wonderfully designed and has a minefield of information which would be of interest to a person associated with the Earth Moving and Mining Industry.

It also has a section for listing the products pertaining to the Stone trade, which brings the buyers and sellers together. Further sections list used machines ranging from hydraulic excavators, Dozers, Cranes and other Stone processing machines like bridge saws, line polishers, gangsaws. It also offers used Wire saw, chain saw, hydraulic drills and rock splitters and array of cranes viz. telescopic truck cranes, Grove Cranes & Tower cranes.

A must visit site for any person associated with the Granite / Marble / Quarrying Industry.

Hydraulic Excavator with Digging Operation Assisting System

2001.09 The Japan Society of Mechanical Engineers by Kazuo Fujishima, Hiroshi Ogura and Sadahisa Tomita
Trench digging for underground pipelines has never been easy, especially the operator cannot set a guideline for digging reference and at times does not have a clear line of sight and needs to be assisted by another person. This paper describes the development of a hydraulic excavator equipped with an electrical lever system (In place of the conventional pilot lever). The excavator is equipped with a limited plane digging control system with a display monitor. With the help of this system the operator can pre-set a desired working plane through the monitor screen. Then digging control system will automatically control the actuators so that the bucket will not go below the set plane (Level).

This system also allows the plane to be set either horizontally or in any angle to the horizontal. The monitor will display the digging state in real time.

This systems will be quite useful especially for the City Water supply Pipe Lines, Storm Water Drains, Desilting of Canals, Sewer sytems, Telecom Cable laying and other under water digging applications viz for increasing the draft at the harbours, etc.

GPS used at the World's Largest Open Pit Mine

One of the largest open pit mines in the world can be found in the Atacama Desert in the north of Chile, South America. The Chuquicamata mining complex is located 1,650 Km North of Santiago, at 2,870 meters above sea level. It has two open pit mines, Chuquicamata and Mina Sur.

Chuquicamata started operations in 1910, though its deposits were known for centuries to the local native peoples. Chuquicamata copper mine is currently 3 miles long, 2.36 miles wide, and 0.53 miles deep.

Since industrialised exploitation started in 1915, approximately 1.6 billion metric tons of ore have been removed, and a similar figure is expected to be obtained within the next 25 to 30 years. The production of Codelco Norte are some 964,930 tons of cathodes obtained by electrorefining and electrowinning, with a purity of 99.99% copper. It also produces some 26,826 tons of molybdenum. Also, some other byproducts are obtained, such as anodic slimes and sulphuric acid.

More than 1,000 people work in the Chuquicamata mining operation, with a fleet of one hundred and ten 3,300HP off-hightway trucks with a loading capacity of up to 360 metric tons and a maximum speed of 45 m.p.h.

Such large open pit mines require the latest technology to ensure its operation is undertaken in a safe, efficient manner, and many are using wireless technology and GPS satellite systems.

To prevent accidents, wireless communication and GPS satellite systems are used to tell the equipment operators the location of nearby equipment and obstacles, and warns them when they get too close.

CAN bus Technology in Hydraulic Excavators for Efficient Communication

At the conference of the Society of Automotive Engineers (SAE) in Detroit 1986, staff from Robert Bosch GmbH presented the so-called Automotive Serial Controller Area Network (CAN). In the 1990s, CAN was very quick to gain significance, and is today the standard protocol in the automotive area. As CAN only provides a simple exchange of data, various application protocols based on CAN were developed. One of those is SAE J1939, which was specially developed for applications in heavy goods vehicles, buses and mobile machinery like Hydraulic Excavators. Today, SAE J1939 is used in many different types of vehicles for communication between various control devices, which are generally termed as Electronic Control Units (ECU).

It is also used in myriad other applications including factory automation, building automation, aircraft and aerospace.

The CAN bus replaced bulky wiring harnesses with a two-wire differential cable. With the increasing trend of integrating IT Solutions on Hydraulic Excavators for superior productivity and fuel efficiency, the need for CAN bus feature has become a bare necessity, As it contributes to superior reliability & diagnostic ease as compared to bulky wiring harnesses.

Some leading manufacturers like JCB have already adopted this feature on their JS200 Hydraulic Excavator.

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Indian Granite Industry

The Indian Granite Industry has become the 3rd largest foreign exchange earner among minerals (Mineral Exports account of approx 20% of total exports) from India. As per the information furnished by the Indian Bureau of Mines (IBM), the export of granite and products thereof during the year 2001-02 stood at INR 1,874 Crores. Even before India has been acclaimed as the leader in software services and now an emerging leader for engineering and automobile goods, the Indian Granite Industry has carved a niche for itself amongst all the leading markets around the world.

Indian Granite Varieties such as pure black, tan brown, white galaxy, blue from Visakhapatnam and grey from Karnataka and Andhra Pradesh were used Extensively in construction, according to industry sources.