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Fabricante : Grizzly
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Arquivo Nome : g0492_m.pdf
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Turning the dial clockwise moves the slide toward the workpiece. Compound Rest Handwheel The compound rest handwheel controls the position of the cutting tool relative to the workpiece. The graduated dial is adjustable using the same method as the dial on the cross slide. Angle adjustment is held by two hex nuts on the base of the compound rest. To determine and set the needed spindle RPM for cutting: 1. Use the table in Figure 31 to determine the cutting speed required for the workpiece material. Cutting Speeds for High Speed Steel (HSS) Cutting Tools Workpiece Material Cutting Speed (sfm) Aluminum & alloys 300 Brass & Bronze 150 Copper 100 Cast Iron, soft 80 Cast Iron, hard 50 Mild Steel 90 Cast Steel 80 Alloy Steel, hard 40 Tool Steel 50 Stainless Steel 60 Titanium 50 Plastics 300-800 Wood 300-500 Note: For carbide cutting tools, double the cutting speed. These values are a guideline only. Refer to the MACHINERY'S HANDBOOK for more detailed information. Figure 31. Cutting speed table for HSS cutting tools. Awarning Failure to follow RPM and feed rate guidelines may threaten operator safety from ejected parts or broken tools. G0492 12" X 36" Combo Lathe/Mill -27- 2. Determine the average final diameter of the Note: You may need to rotate the chuck by hand workpiece in inches, for the cut to be made. to get the gears to engage. 3. Now use the following formula to determine the closest RPM for the cutting operation: (Cutting Speed x 4) -= RPM Diameter of Cut 4. With the calculated RPM, decide on the closest cutting RPM to what you need. 5. Make sure the spindle is completely stopped before proceeding. 6. Move the levers (Figure 32) to get the RPM range that is closest to your calculated Figure 32. Spindle speed selector levers. RPM: — The range lever selects BLACK DOT = High or RED DOT = Low. — The RPM Lever selects the RPM within that range. -28- G0492 12" X 36" Combo Lathe/Mill Setting Power Feed Rate The carriage has longitudinal and cross slide power feed capabilities. All directions reverse when spindle rotation is reversed. NOTICE Feed rate is based on spindle RPM. Pay close attention to the feed rate you have chosen and be ready to disengage the apron. Failure to do this may cause the carriage to crash into the chuck. 4. Loosen the lash adjuster (Figure 33) and swing the assembly out of the way. 5. Remove the required E-clips, lubricate, and swap out the appropriate change gears. 6. Move the lash adjuster so the gear backlash is at 0.003" to 0.008", and tighten the lock nut. 7. Use the leadscrew lever to select leadscrew rotation direction (Figure 35). 8. Loosen the apron lock bolt, and use the feed lever (Figure 35) to engage the cross slide or longitudinal feed. To set and engage the power feed: 1. DISCONNECT THE LATHE/MILL FROM POWER! 2. Refer to the Change Gear Chart on Page 31 to determine the needed combination of gears and which spindle location to install each gear on. See Figure 33 for the gear installation locations that are referenced by the chart. 3. See Figure 34 for an example of gear combinations that give the longitudinal and cross slide rates. For example: The chart shows that 0.0089" of longitudinal travel per revolution of lead screw is needed, or 0.0019" of cross travel per revolution of lead screw is needed. Figure 34. Using the change gear chart. Figure 35. Leadscrew and feed levers. Note: All change gears are stamped with the number of teeth they have. G0492 12" X 36" Combo Lathe/Mill M -29- Setup for Threading 6. Use the leadscrew lever to select leadscrew direction (Figure 37). Your lathe is capable of cutting inch and metric threads. To setup for threading: 1. DISCONNECT THE LATHE/MILL FROM POWER! 2. Refer to the Change Gear Chart on Page 31 or the chart on the inside of the change gear door to determine the needed combination of gears and which spindle location to install each gear on. See Figure 36 for examples of how gear combinations can achieve your needed threading rate. For example: The chart shows that 24 TPI is needed. Note: All change gears are stamped with the number of teeth they have. 7. Setup the cutting tool, compound rest, and cross slide to cut your threads; and loosen the apron lock (Figure 35). Figure 37. Threading controls. —If cutting inch threads, refer to the Thread Dial Table in Figure 38 to use the thread dial. Inch Threading Longitudinal Cross Feed Feed ABC D ft 1/n“ m M =28 N=35 A y c B A D ">0 ^ ‘-0 № ^ M-24 N-eo M .28 N - 35 M-24 N -60 M - 2 N-3! 0.0040 0.0080 0.0008 0.001 1 ) 5 Ü v 38 * 32 0.0206 0.0412 0.0044 0.008 1 ! 6 40 y 30 38 A 32 0.0172 0.0344 0.0036 0.007 1 1 8 16 x jO 21 A 41 0.0130 0.0260 0.0028 0.005 1 Î 9 40 y 25 30 A 4« 0.0115 0.0230 0.0024 0.004 1 ) 10 3 3 y 30 A h 0.0103 0.0206 0.0022 0.004 ¡ ! 11 il 3 v ü A 44 0.0094 0.0188 0.0020 0.004 V 11.5 2_ y 12 0.0089 0.0178 0.0019 0.003 24 < Ue-I T X 48 |D. 0086 0.0172 0.0018 0.0...