Method and apparatus for using a coolant fluid

A metal grinding apparatus for removal of metal from a workpiece during a machining operation, comprising:

• 1) a holder for a workpiece,
• 2) a rotating grinding tool that is configured to engage the workpiece at a machining interface to remove metal from the workpiece, wherein the machining interface has an—atypical interface profile,
• 3) a coolant nozzle for emitting a stream of a cooling liquid, the coolant nozzle having a flow passage that has an outlet, the coolant nozzle being configured to emit a stream having an atypical cross-sectional profile substantially the same as the atypical interface profile, and having a laser bore that penetrates through the nozzle and intersects the flow passage to provide a line of sight along the laser bore to the flow passage outlet, and
• 4) a removable plug inserted into the laser bore to seal the laser bore during the machining operation while the emitted stream of cooling liquid is directed at the atypical machining interface,
• wherein the laser bore is configured to receive a visible laser that, prior to the machining operation, can be removably inserted into the laser bore in place of the removable plug, wherein the visible laser emits a visible laser beam through the flow passage outlet, for visually positioning the nozzle relative to the metalworking tool, whereby the stream of cooling liquid can be directed at the machining interface,
• wherein the atypical cross-sectional profile of the stream registers with the atypical interface profile of the machining interface, and wherein the atypical profile is a shape other than a linear, rectilinear, circular, oval, and curvilinear profile.