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LATHE SPINDLE NOSE

The lathe spindle nose is the carrier of a variety of workholding devices fastened to it in several ways.

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The spindle is hollow and has an internal Morse taper at the nose end,which makes possible the use of taper shank drills or drill chucks (Figure I-107). This internal taper is also used to hold live centers, drive centers, or collet assemblies. The outside of the spindle nose can have either a threaded nose (Figure I-108), a long taper with key drive (Figure I-109), or a camlock (Figure I-110).

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Threaded spindle noses are mostly used on older lathes. The chuck or face plate is screwed on a coarse right-hand thread until it is forced against a shoulder on the spindle that aligns it. Two disadvantages of the threaded spindle nose are that the spindle cannot be rotated in reverse against a load and that it is sometimes difficult to remove a chuck or face plate (Figure I-111).

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The long taper key drive spindle nose relies on the principle that a tapered fit will always repeat its original position. The key gives additional driving power.A large nut having a right-hand thread is turned with a spanner wrench. It draws the chuck into position and holds it there.  Camlock spindle noses use a short taper for alignment. Studs arranged in a circle fit into holes in the spindle nose. Each stud has a notch into which a cam is turned to lock it in place. All spindle noses and their mating parts must be carefully cleaned before assembly. Small chips or grit will cause a work holding device to run out of true and be damaged. A spring cleaner (Figure I-112) is used on mating threads for threaded Figure I-111 The chuck can be removed by using a large monkey wrench on one of the chuck jaws while the spindle is locked in a low gear. A long steel bar may also be used between the jaws. The knockout bar should never be used to remove a chuck, as it is too light and will bend.

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Figure I-112 A spring cleaner is used for cleaning internal threads on chucks.spindles. Brushes and cloths are used for cleaning. A thin film
of light oil should be applied to threads and mating surfaces.

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