l have just finished working on a research project (Dublin, Ireland)were we designed a system for the verification of medium sized CMM's.
The system uses a sphere plate and dedicated software.
We are now looking at methods to calibrate this plate and others that we intend to purchase/manufacture in the future.
l am looking for links to research material and companies regarding the above.
l look forward to any comments or suggestions.

Paul Turner
IT Tallaght
Dublin, Ireland
paul.turner@it-tallaght.ie