Capacities of a scrapper bowl ranges from 3 metre cube to 50 metre cube. The speed of operation is governed by speed of towing vehicles, which is 8 km per hour when hauling, and 3 km per hour, when scrapping.

In any case, cost allotted to maintenance and repairs should be at least efficient to keep equipment in work order. However, records of similar equipment may serve as a good guide for determining average annual cost of maintenance and repairs.

Depending upon mountains, bulldozer maybe crawler tractor mounted bulldozer or will tractor mounted bulldozer. The latter can attain higher travel speed on job and can be moved on paved floor without causing damage to floor.

Belt conveyors, pipelines, air compressors, etc. are examples of continuous flow type equipment. Whereas, motor graders, Bulldozers, scrappers, etc. are examples of mixed type equipment.

In general, it is to be observed that drilling pattern selected should give desired breakage of rock with minimum over breakage. The term drilling pattern is used to indicate spacing of drill holes.

The actual drilling points in case of carbide insert bits consists of very hard metal, tungsten carbide, which is embedded in steel. These bits are considerably more expensive than Steel bits.

Water or coolant must always be used to cool and lubricate tip. The lubrication reduces heat, prolonging drill bit life and helps to avoid heat fractures in material. Water is most often used as a lubricant, since it works very well and has no cost.

While using Manilla rope, things to be considered are- ropes should possess required strength and resistant to wear and tear. The Rope should be stored in dry and well ventilated place. The rope should never be placed coiled on a damp surface.

Tile bits can be used with hand drill, but are best used in a variable speed power drill on slow speed. When drilling glass, some form of lubricants like turpentine or white spirit should be used to keep tip cool. Ceramic tiles can be drilled using a masonry bit if it is used at a slow speed.

The height of Tower maybe 25 to 30 meters and se cranes are found to be extremely useful in construction of tall buildings in congested area. The ground area required for such cranes is also very small and y can be prepared very close to buildings.