Figure 9-14.—Follower rest.Figure 9-15.—Taper attachment.2. To support and provide a center bearing for oneend of the work, such as a shaft, being bored or drilledfrom the end when it is too long to be supported by achuck alone. The center rest is clamped in the desiredposition on the bed and is kept aligned by the ways, asillustrated in figure 9-13. The jaws (A) must be carefullyadjusted to allow the work (B) to turn freely and at thesame time remain accurately centered on the axis of thelathe. The top half of the frame is a hinged section (C)for easier positioning without having to remove thework from the centers or to change the position of thejaws.Follower RestThe follower rest is used to back up small diameterwork to keep it from springing under the cuttingFigure 9-16.—Thread dial Indicator.pressure. It can be set to either precede or follow thecutting action. As shown in figure 9-14, it is attacheddirectly to the saddle by bolts (B). The adjustable jawsbear directly on the part of the work opposite the cuttingtool.Taper AttachmentThe taper attachment, illustrated in figure 9-15, isused for turning and boring tapers. It is bolted to the backof the carriage. In operation, it is connected to the crossslide so that it moves the cross slide traversely as thecarriage moves longitudinally, thereby causing thecutting tool to move at an angle to the axis of the workto produce a taper.The desired angle of taper is set on the guide bar ofthe attachment. The guide bar support is clamped to thelathe bed Since the cross slide is connected to a shoethat slides on this guide bar, the tool follows along a lineparallel to the guide bar and at an angle to the work axiscorresponding to the desired taper.The operation of the taper attachment will be furtherexplained under the subject of taper workThread Dial IndicatorThe thread dial indicator, shown in figure 9-16,eliminates the need to reverse the lathe to return thecarriage to the starting point each time a successivethreading cut is taken. The dial, which is geared to thelead screw, indicates when to clamp the half-nuts on thelead screw for the next cut.The threading dial consists of a worm wheel whichis attached to the lower end of a shaft and meshed with9-9
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