Making simple wooden lathe turnings out of 4140 steel is easy to do. Radial and tangential threads can be cut on a CNC router, thus allowing for tighter tolerances than if it had been machined on a traditional lathe
A CNC router will also allow you to machine out the center hole in your turning. A traditional lathe would require a center-punching jig or some other tooling to get this done
CNC routers are also useful for cutting very fine threads on difficult contours and surfaces, such as those found on the bottom of flywheels or race car rotors.
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