Machining a machine tool spindle with NTRX-300L

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[@KSMechanicalEngineering]

Very satisfying machine

[@mayuinc]

Can these machines be purchased with Siemens controllers?

[@VeteranTuner]

Very good video! Is the NTRX-300L also available with a single turret station?

[@madmat990]

Thanks for the video. Is the material prehardened? It looks like it's ready to use and doesn't require a final grinding step...

[@user-tc2ky6fg2o]

It depends. If this spindle goes into a low-accuracy machine, like a manual lathe, it can be turned ready. But I assume this particular part is just a "raw" spindle, and yes, it will be ground. Any precision bearing that is used in CNC machines needs very tight tolerances and roundness. Moreover, the steady rest can not provide such a runout (or concentricity between the two sides), that will be suitable for a new machine, that will make maybe other spindles... On a grinding machine, you can grind all surfaces in one setup, achieving the best runout for the whole shaft. I don't think the spindle needs to be hardened, just to make of some more alloyed steel. In the video it is not hardened, otherwise, you can't use a tap to make threads. The bearing seats and chuck nose can be hardened later selectively by induction or laser hardening for better wear resistance if necessary.

[@sunroad7228]

Machining a machine tool spindle - "In any system of energy, Control is what consumes energy the most. No energy store holds enough energy to extract an amount of energy equal to the total energy it stores. No system of energy can deliver sum useful energy in excess of the total energy put into constructing it. This universal truth applies to all systems. Energy, like time, flows from past to future" (2017).