Machining system with flow restrictor for supercritical carbon dioxide-based minimum quantity lubrication machining

A machining system comprising:

• a coolant tube assembly comprising:
• a tubular body disposed about a central axis and defining a central bore disposed about the central axis and extending in a first axial direction from a proximal end of the tubular body toward a distal end of the tubular body;
• a shoulder extending radially outward from a perimeter surface of the tubular body;
• a restrictor disposed within the central bore and defining a single aperture extending through the restrictor and having a diameter between 0.250 mm and 0.400 mm;
• and
• a sleeve disposed rotatably about the distal end of the tubular body and defining a male threadform, the sleeve including a mating shoulder that extends radially inward of the shoulder of the tubular body.

A coolant tube for a tool holder of a machining system, the coolant tube comprising:

• a tubular body disposed about a central axis and defining a central bore disposed about the central axis and extending in a first axial direction from a proximal end of the tubular body toward a distal end of the tubular body, the central bore having a diameter between 7 mm and 9 mm;
• a shoulder extending radially outward from a perimeter surface of the tubular body;
• a wafer fixed within the central bore of the tubular body and having an axial thickness of less than 5 mm, the wafer defining a single aperture extending axially through the wafer, the single aperture having a diameter between 0.250 mm and 0.400 mm;
• and
• a sleeve disposed rotatably about the distal end of the tubular body and defining a male threadform, the sleeve including a mating shoulder that extends radially inward of the shoulder of the tubular body.