System for controlling the size and surface geometry of an orifice

A system to smooth and radius a microhole in a workpiece to calibrate the microhole, the workpiece secured in a nest comprising:

• a plurality of nests on a platform;
• means for indexing in timed sequence the nests through a plurality of treatment stations and a feed nozzle associated with each treatment station adapted to releasably engage the workpiece;
• means for flowing an abrasive material through the microhole at a treatment station while the associated feed nozzle is engaged to the workpiece;
• means for flowing a fluid through the microhole a first time at a treatment station while the associated feed nozzle is engaged to the workpiece to flush the microhole;
• means for flowing a fluid externally of the workpiece at a treatment station while the associated feed nozzle is engaged to the workpiece;
• means for flow calibration fluid though the microhole at a workstation while the associated feed nozzle is engaged to the workpiece;
• means for flowing abrasive slurry the microhole at a treatment station while the associated feed nozzle is engaged to the workpiece for predetermined time based on the flow rate of the calibration fluid through the microhole to calibrate the microhole;
• and
• means for flowing air through the microhole at a treatment station while the associated feed nozzle is engaged to the workpiece, the treatment station being positioned downstream of the treatment station where the calibration fluid flows through the microhole.