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Shock treatment processes termed as axing, ribbing & bush hammering are executed on the stone slabs by means of a Bush Hammering Machine. The Bush Hammering Machine beats the stone surface with hammers having more or less close – set pyramidal points. The percussion work is executed by the Bush Hammering Machine by means of one or more tool–equipped heads. The Bush Hammering Machine can be single Heads carrying several hammers, several heads carrying a single hammer or rotating heads with a variable number of tools. The most common Bush Hammering Machines work on slabs laid horizontally, in two different ways, with a moving bench and stationary slabs or vice- versa. The Bush Hammering Machine with stationary slabs and mobile benches have a bridge structure (like the saws and polishers) and the movements of the bridge on rails combined with the work unit’s movement on the bridge make it possible to cover the entire surface of the slab. On the Bush Hammering Machine with moving slabs the latter move on rollers below column-plus- beam structure in a central position, equipped with the head unit that moves back and forth sideways to the slab. In their fullers form, and where high production is required, the Bush Hammering Machine are installed with roller units for feeding the material, water-jet cleaning units, a suction unit, and tipper benches at the entrance and exit. The actual work unit containing the scratching plates etc. of. the Bush Hammering Machine is normally located in a soundproofed cabin. The other types of Bush Hammering Machine machines include: bush hammering machines for curb – and paving stones, bush hammering machines that can work on cylindrical surfaces and/ or spherical ones and bush hammering machines with two 45˚ heads to create a herringbone pattern.
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