Granite

Africa Black Granite

Africa Black Granite

Absolute Black Granite

Absolute Black Granite

Blu Lanhelin Granite

Blu Lanhelin Granite

Datasheet

  The use of granite

  Black Africa granite 
  Fine black granite
  GNU CR5 fine black granite
  Blue Lanhhelin granite

   Materials comparison

   
Working tolerances
    Special workings

 


Granite in metrology

Due to its unique properties, black granite in recent years, has been used extensively in the field of measuring  instruments, both for traditional ones (surface plates, parallels, set squares, etc…), as well as modern ones:  CMM machines, physic-chemical process machine tools.

Suitably lapped black granite surfaces are not only extremely precise but also ideal for use in conjunction with air bearings.

The  reason  of  the  choice  of  black  granite  in  manufacturing  of  precision units are the following:

  • DIMENSIONAL STABILITY: black  granite  is  a  natural  aged material   formed   over   millions of   years   and    therefore   displays  great  internal  stability
  • THERMAL STABILITY: the  linear  expansion  is  much  lower  than  the  steel  or  cast  iron ones
  • HARDNESS: comparable to good-quality tempered steel
  • WEAR RESISTANCE:  instruments last longer
  • ACCURACY: the flatness of the surfaces is better than the one obtained with traditional materials
  • RESISTANCE TO ACIDS, NON-MAGNETIC ELECTRICAL INSULATION RESISTANCE TO OXIDATION: no corrosion, no maintenance
  • COST: working the granite with state-of-the-art technology prices are lower
  • OVERHAUL: Eventual servicing can be carried out quickly and cheaply

Informativa:
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