A slender part with a long overhang bends away from the tool, and its diameter and straightness wander. On a Swiss-type lathe the headstock slides and pushes the bar out through a guide bushing, and the tools of the main gang cut right at the bushing face: the cut is always next to the bushing that holds the bar, so the unsupported length stays short however long the part is. The subspindle takes the part at cut-off and carries it to the back tool gang, which works its other end while the next part starts, then the part is ejected onto a parts conveyor. Socket set screws suit it: ASTM F912 (alloy) and F880 (stainless) allow set screws to be machined, ASME B18.3 sets the point on the end, cup, flat, oval, cone or half dog, and the hex socket in the other end is broached.
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model dataSliding headstock, guide bushing, ground bar, tool gangs and the synchronised subspindle as machine-tool references describe them. Set screws machined per ASTM F912 and F880; the 1/4-20 cup point (0.118 to 0.132 in.) and 1/8 in. hex socket from ASME B18.3-2012; the pilot for the socket drilled about the size of the hex across flats, deeper than the socket and countersunk, as broaching references describe it. Bar and set screw drawn to scale (the set screw 1 in. long); the machine, its tool gangs and the parts conveyor are generic and the pilot's depth is illustrative. The spindles and the ejected part are shown slowed down, the thread is drawn as a ghost (threading has its own pages), and the bend and taper in the comparison are exaggerated.
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