Assessments - 1, GPA: 4 ( )

Fabricante : Southbend Arquivo Tamanho: 6.59 mb Arquivo Nome : Língua de Ensino:

Mounting Dead Center in Spindle 1. DISCONNECT LATHE FROM POWER! 2. Thoroughly clean and dry the tapered mating surfaces of the spindle bore, tapered sleeve, and the center, making sure that no lint or oil remains on the tapers. 3. Insert the center into the sleeve, then insert the sleeve into the spindle bore through the chuck or faceplate. Figure 66 shows an example of the dead center installed in the spindle, using a lathe dog and faceplate for turning between centers. Dead Center Figure 66. Example of using a dead center with a faceplate and lathe dog. To avoid premature wear of the dead center or damage to the workpiece, use low spindle speeds and keep the tip of the dead center mounted in the tailstock well lubricated. -37 EVS Toolroom Lathes OP E R A T ION For Machines Mfg. Since 7/09 Removing Center from Spindle To remove the sleeve and center from the spindle, insert a piece of round bar stock or similar tool through the outboard end (on the left side of the headstock), then tap the sleeve loose. Note: Hold onto the sleeve and center as you tap them loose to avoid dropping them and damaging the tip of the center or the bedways. Mounting Center in Tailstock Either a dead center or live center can be mounted in the tailstock. Mounting instructions are the same for both. Figure 67 shows an example of a dead center mounted in a tailstock. Dead Center Figure 67. Example of using a dead center installed in the tailstock. To mount a center in the tailstock: 1. DISCONNECT LATHE FROM POWER! 2. Thoroughly clean and dry the tapered mating surfaces of the tailstock quill bore and the carbide-tipped dead center, making sure that no lint or oil remains on the tapers. 3. Use the tailstock quill handwheel to feed the quill out from the casting about 1". (Do not feed the quill out of the casting more than 2" or stability and accuracy will be reduced.) 4. Insert the center into the tailstock quill. 5. Seat the center firmly into the quill during workpiece installation by rotating the quill handwheel clockwise to apply pressure, with the center engaged in the center hole in the workpiece. Note: Only apply enough pressure with the tailstock quill to securely mount the workpiece between centers. Avoid overtightening the center against the workpiece, or it may become difficult to remove later, and it will result in excessive friction and heat, which may damage the workpiece and the center. Removing Center from Tailstock To remove the center from the quill, hold onto it with a rag in one hand, then rotate the tailstock handwheel counterclockwise to draw the quill back into the casting until the center releases. -38 For Machines Mfg. Since 7/09 OP E R A T ION EVS Toolroom Lathes Steady Rest The steady rest supports long shafts and can be mounted anywhere along the length of the bed. To install and use the steady rest: 1. DISCONNECT LATHE FROM POWER! 2. Thoroughly clean the machined base of the steady rest, then place it on the lathe bedways so the triangular notch fits over the bedway prism. 3. Position the steady rest where required to properly support the workpiece, then tighten the hex nut shown in Figure 68 to secure it in place. Figure 68. Steady rest components. Wing Bolt Lock Knob Hex Nut Finger Adjustment Knob Finger Roller 4. Loosen the lock knob and open the steady rest so the workpiece can rest on the bottom two finger rollers, as shown in Figure 69. ! Figure 69. Workpiece mounted in the steady rest. 5. Close the steady rest so that the workpiece is inside the finger rollers, then tighten the lock knob. 6. Loosen the three wing bolts so the finger roller positions can be adjusted. 7. Use the finger adjustment knobs to just touch the finger rollers against the workpiece without causing workpiece deflection. 8. Tighten the three wing bolts. Note: The finger rollers should properly support the workpiece but allow it to freely rotate. Follow Rest The follow rest mounts to the saddle with two cap screws (Figure 70). It is used on long, slender parts to prevent workpiece flexing from the pressure of the cutting tool during operation. Adjust the sliding finger rollers on the follow rest in the same manner as those on the steady rest. Cap Screws Figure 70.. Follow rest attachment. -39 EVS Toolroom Lathes OP E R A T ION For Machines Mfg. Since 7/09 Compound Slide The compound slide handwheel has an indirect- read graduated scale. This means that the distance shown on the scale represents the actual distance the tool moves, which will remove twice as much material from the diameter of the workpiece. The base of the compound slide has another graduated scale used for setting the tool to a specific angle. To set the compound slide at a certain angle: 1. Loosen the two hex nuts at the base of the compound slide (1 of 2 shown in Figure 71). Figure 71. Compound slide set at an angle. Hex Nut Compound Slide 2. Rotate the compound to the desired angle, as indicated by the scale at the base, then retighten the two hex nuts. Tip: ...

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