Definition  This device shall be used to obtain  surface smoothness without stress and  heat-related  distortion  on  sensitive  surfaces such as glass and ceramic.  2.2.1 Machine shall be able to work on both  sides of a workpiece at the same time.  2.2.2 Device shall have upper and lower  wheels (grinding discs) and carrier  wheels  (for  workpieces)  rotating  simultaneously  but  controlled  separately;  i.e.  independent  and  adjustable motors both for the wheels  and work-carriers.  2.2.3 Machine shall be suitable for working  pieces of materials with hardness up to  ~15 Giga Pascal (GPa).  2.2.4 Workpiece carriers shall have at least  5 slots for working pieces.  2.2.5 Machine and components of the device  shall have a cast-iron or steel structure  to avoid vibration.  2.2.6 Machine shall provide safety features;  protection covers for the whole area  (e.g. between the working wheel and  the work holder drive system, serving  both as safety and splash guard).  2.2.7 Machine shall have a protected electric  switch  cabinet  with  controlled  temperature  by  air  conditioning  system. 2.2.8 The Grinding discs (upper and lower  wheels)  outer  diameter  shall  be  minimum 700 mm.  August 2020 c4f_annexiitechspeciiitechoffer_en.doc  Page 27 of 49 