SCD / MCD CNC Planetary Grinding Machine - Coborn's PG4

With Ultra-high precision, The PG4 is a CNC grinding machine for single or mono crystal diamond tool manufacture. The PG4 enables the automated production of ultra-high precision diamond tools.
Launched in 2016, the industry leading PG4 offers automated, ultra-high precision grinding, designed to meet the most complex of demands by toolmakers working with natural (MCD) or synthetic single crystal diamond (SCD), manufactured by either high pressure high temperature (HPHT) or chemical vapour deposition (CVD).

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Hi, can I know, what is the bond of the wheel on the machine, or is it a cast iron plate? Thanks..