Stub arbor

Cutters which are used close to the spindle, such as shell end mills, are mounted on a stub arbor. Fig. 11.10. This arbor is located, held, and driven in the spindle in the same way as a standard arbor. The cutter is located on a spigot or stub and is held in position by a large flanged screw. Two keys on the arbor provide the drive through key slots in the back face of the cutter. 

Release the workpiece and reset with the end face protruding heyond the edge of the vice jaws, again seated on parallels. Mount a shell end mill on a stub arbor and load into the machine spindle. 

Dual-cone or double-stub arbor versions are yet another option that is generally used only for very wide coils or heavy coils with small inside diameters which require support at both ends to prevent excessive mandrel deflection. With the double-stub arbor style, a mandrel is inserted into both ends of the coil for support with both assemblies having the ability to travel. This variety is normally quite expensive because, in effect, you are buying two complete traveling reel assemblies with stubby mandrels. 

Cutters which are used close to the spindle, such as shell end mills, are mounted on a stub arbor. 

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