Coolant supply system for a machine tool

A coolant supply system for a machine tool comprising:

• a) first means for directing coolant to one location in a machine tool;
• b) means for increasing coolant flow to said one location during one type of machining operation requiring increased coolant flow;
• c) second means for directing coolant to another location in a machine tool;
• d) said first and second means comprising a coolant supply circuit;
• e) said increasing means including means for automatically shutting off coolant flow in said second means during the one type of machining operation thereby diverting all coolant flow to said one location only;
• f) said coolant supply circuit includes a first coolant path associated with said one location and a second parallel coolant path associated with said another location;
• and
• g) electrically actuated valve disposed in said second coolant path for shutting off the coolant flow in said second coolant path during one type of machining operation.

A coolant system for a machine tool comprising:

• a) a coolant source;
• b) first means for directing coolant to the inside of a workpiece from said coolant source;
• c) second means for directing a coolant to the outside of a workpiece from said coolant source;
• d) third means for simultaneously conveying coolant from said coolant source to said first means and second means;
• and,
• e) an electrically actuated valve for automatically and selectively directing coolant only to the inside of the workpiece while continuously conveying said coolant from said coolant source.