valutazioni - 3, GPA: 4
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Facilità d'uso
Since 9/00) -55- Note: In the following step, take care to keep the shaft keys in place during the change gear exchanges. Threading 4. Remove the cap screws, lock washers, and flat washers that secure the top and bottom change gears, install the correct gears as directed by the threading or feed rate charts, then secure them in place with the removed fasteners. To prevent binding the gears, do not over-tighten the cap screws—they merely hold the gears in place. Note: The top change gear engages the larger 127 tooth middle gear for all applications. However, the bottom change gear engages the 127 tooth middle gear for all applications except metric threading operations. In this case, the bottom change gear needs to be reversed so that it will engage the smaller 120 tooth middle gear (see Figure 82 for an illustrated example). metric threading. 5. Move the middle gears back in contact with the top and bottom change gears so that there is approximately 0.002" of play as they mesh, then re-tighten the pivot stop and middle gear hex nuts. Do not over-tighten these hex nuts—they merely hold the components in place. 6. Replace the headstock cover before re-connecting the lathe to power. The following procedures describe how to use the threading controls and charts to set up this lathe for a threading operation. If you are unfamiliar with the process of cutting threads on a lathe, we strongly recommend that you read books, review industry trade magazines, or get formal training before attempting any threading projects. Setting Threading Controls The threading charts on the headstock face display the change gear and control setting for metric and inch threading. Using the controls on the lathe, follow along with the example below to better understand how to set up the lathe for the desired threading operation. Example: Inch Thread Pitch of 11 TPI 1. DISCONNECT LATHE FROM POWER! 2. Locate "11" in the inch threading chart on the face of the headstock (see Figure 83). inch threading chart for cutting threads of 11 TPI. 3. Configure the change gears as directed in the illustration above the "11" location. -56- Model G9730/G9731 (Mfg. Since 9/00) 4. Set the quick change knobs as shown in Figure 84. Note: Keep in mind the spindle must be completely stopped before using the quick change knob A-C on the headstock. 2.0 W4AD 2.5 Y4BD W1AD X4AD Z1AD Y4AD X 1 AD 3.0 4.0 4.5 5.0 Ml 127 1 n i m ¡) 1 A № ; / B c A B ! D _EJ D □ _DJ E _D_ _EJ D_ E D j 4 5 8 10 16 20 32 40 .0100 .0083 0050 [J k 55 9 S3 "<#■ 1 "I rpi I_ 0046 3 & 6i 11* 13 23 26 '46. fsl I I I .0036 A t? _LA. .24. ?R LlSj !__ I 00f-0 : Figure 84. Quick change knobs configured for 11 TPI threading. 5. Rotate the feed selection knob on the quick change gearbox to the left to select the leadscrew for powered movement. Halfnut Lever The halfnut lever engages the carriage with the leadscrew which moves the cutting tool along the length of the workpiece for threading operations (see Figure 85). Before attempting to push the halfnut lever down to engage the halfnut with the leadscrew, always make sure the feed ON/OFF knob is pushed in so that the carriage is not engaged with the feedrod. Figure 85. Location of the halfnut lever. NOTICE Even though there is a lock-out device in the apron to prevent the feed control knob and the halfnut lever from being engaged at the same time, this lock-out device could break with enough force. If you attempt to engage the feed control knob and the halfnut lever at the same time, severe lathe damage could result and will void the warranty. Model G9730/G9731 (Mfg. Since 9/00) -57- Thread Dial Thread Indicator Table The numbers on the thread dial are used with the thread indicator table (on the headstock left cover) to show when to engage the halfnut during inch threading. This will ensure that the tool tip will enter the same thread groove on each successive pass. Otherwise, the threads will be damaged. The thread dial gear must be engaged with the leadscrew for this to work. Loosen the cap screw shown in Figure 86, then pivot the dial gear toward the leadscrew so that it properly meshes with the leadscrew threads, then re-tighten the cap screw. Figure 86. Thread dial gear engaged with the leadscrew. NOTICE When threading, we recommend you use the slowest speed possible and make multiple light cuts. This will give you better control of when to engage/disengage the halfnut and prevent damaging the workpiece or lathe. The thread indicator table is located on the head-stock left cover (see Figure 87). 13“ X 40" LATHE Figure 87. Thread indicator table. Find the TPI (threads per inch) that you want to cut in the left columns (under T.P.I.), then reference the dial number in the right columns (under SCALE). The dial number indicates when to engage the halfnut for a specific thread pitch as indicated by the thread dial (see Figure 88). Figure 88. Thread dial. NOTICE Th...
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