Best Suitable for Surface Finishing of Optical Communication Connectors. Single-unit, Automatic Operation that Consists of Three Processes, Rough Grinding, Medium Finish Grinding, Final-Lapping Finish. Highly -rigid air s......Best Suitable for Surface Finishing of Optical Communication Connectors. Single-unit, Automatic Operation that Consists of Three Processes, Rough Grinding, Medium Finish Grinding, Final-Lapping Finish. Highly -rigid air spindles and double-cup grind wheels enable highly efficient operation of rough and medium finish grinding.