This is Prohibited
Wheels that exhibit cracks may not be refurbished and must be replaced immediately. In addition, application of heat and deposition welding processes of any kind as well as material reformations are not permissible. And, of course, the removal of damages with a depth of more than one millimetre in the base metal or more than 50 mm away from the outer flange.
And, last but not least, metal-cutting processes (e.g. by CNC machines) constitute a risk in the refurbishment of diamond cut wheels. Therefore, according to our information, renowned car manufacturers have declared this as impermissible for safety reasons in their internal service information documents.