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OTMT SC4 User Manual And Installation Manual

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SC4 Bench Lathe
User's Guide and Installation Manual
Version date: 02-09-11
Please Read This Manual Carefully Before Operating this Machine.
Copyright by Travers Tool Co., Inc., February 2011
PDF created with pdfFactory Pro trial version



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  Summary of Contents for OTMT SC4

  • Page 1 SC4 Bench Lathe User’s Guide and Installation Manual Version date: 02-09-11 Please Read This Manual Carefully Before Operating this Machine. Copyright by Travers Tool Co., Inc., February 2011 PDF created with pdfFactory Pro trial version
  • Page 2: Table Of Contents

    Table of Contents IMPORTANT SAFETY INSTRUCTIONS..................... 4 Lathe Features........................... 5 Welcome ............................6 User Manual ............................ 6 Capabilities of the Lathe ........................6 Setting up the Lathe .......................... 7 Electrical Requirements ........................7 Lifting the Lathe ..........................7 Bench Mounting..........................8 Machine Cleanup..........................
  • Page 3 Cutting Tool Selection........................22 Setting the Tool Height ........................23 Quick Change Tool Posts ......................24 Positioning the Tool ........................24 Rotational Speed Selection......................25 Facing a Workpiece ........................25 Cleaning up a Facing Cut....................... 27 Facing with Power Feed ........................ 27 Center Drilling a Workpiece ......................
  • Page 4: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS Common sense and caution are factors which cannot be built into any product. These factors must be supplied by the operator. PLEASE REMEMBER: 1. When using electric tools, machines or equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shock, and personal injury. 2.
  • Page 5: Lathe Features

    Lathe Features PDF created with pdfFactory Pro trial version
  • Page 6: Welcome

    With appropriate tooling it is even possible to create round, concave and cubical shapes on the lathe. The SC4 lathe is equipped with a powerful 1000-watt brushless DC motor with electronic speed control, providing strong torque at all speeds, electronic braking and instant direction reversal for operations such as tapping.
  • Page 7: Setting Up The Lathe

    3-prong wall outlet. The extension cord must have at least 15 Amps of current- The SC4 lathe should be located in a well- carrying capacity to avoid overheating the cord, lighted and well-ventilated area free from which could cause a risk of fire.
  • Page 8: Bench Mounting

    Bench Mounting For stability and safe operation the lathe must be bolted to a sturdy machine stand or workbench capable of safely supporting at least 350 lbs. A carpenters or machinists level should be used to verify that the lathe bed is level.
  • Page 9: Operating Controls And Features

    or retracts the carriage across the ways. This motion may control the depth of a cut for a Operating Controls and Features turning or boring operation or may advance the cutting tool across the face of a workpiece in a facing operation.
  • Page 10: Carriage Lock Screw

    Carriage Lock Screw For certain operations such as facing, in which the tool is advanced across the face of the work by the cross-feed handwheel, it is good practice to lock the carriage to the ways to prevent the carriage from moving during the cut.
  • Page 11: Tailstock Handwheel

    may be adjusted by removing the tailstock from the end of the lathe ways and adjusting the locking nut on the underside of the tailstock. A stop screw located between the ways at the right end of the lathe prevents the tailstock from falling off the end of the lathe.
  • Page 12: Electronic Controls

    Electronic Controls Setting the Spindle Speed The main power switch for the lathe is the red To start the spindle rotation, press the Start rocker switch located on the control panel. A button. The current spindle rotational speed green pilot lamp illuminates when the power is and direction (FOR or REV) are displayed on on.
  • Page 13: Spindle Disengagement Knob

    such as a workpiece working loose from the spindle should be disengaged for safety so that chuck. the rotating chuck does not pose a hazard. With the lathe stopped, turn the knob to the right about ¼ turn to disengage the spindle. To re-engage it, rotate the knob to the left while also turning the chuck by hand to allow the gears inside the head to mesh.
  • Page 14: Tooling And Accessories

    4-Jaw Chuck This section describes some useful accessories and tooling for the SC4 lathe. Item # 87-116-026 Adjusting the jaws individually makes it High Speed Steel Cutting Tools possible to center a round workpiece, or a reference point on an irregular workpiece, with For the home machinist and light industrial great precision.
  • Page 15: Tailstock Chuck And Arbor

    Center drills are available in many sizes and made of various materials, much like drill bits. For work on the SC4, a set of 5 HSS center Since the chuck and the arbor are purchased drills, #1 through #5 in size, will meet most of separately, care must be taken that the front the needs the operator is likely to encounter.
  • Page 16: Drill Sets

    end sharply into the chuck. The arbor should now be tightly coupled to the chuck. When mounting the arbor in the tailstock taper, again, both tapers should be free from any oil, grease or grit to ensure a tight coupling. Hold the chuck in one hand, then snap it rapidly into Set of 2- and 4-flute end mills the tailstock taper to ensure that the tapers...
  • Page 17: Cutting Fluid

    Tapmatic Cutting Fluid Item # 81-007-050 Safety shield Item # 99-003-525 When machining aluminum, specially formulated cutting fluid such as Tap-Magic Aluminum will give superior results. It helps Cutting Fluid prevent chips from welding to the cutting edges of the tool – a common problem when machining aluminum.
  • Page 18: Initial Safety Checks

    Regular Safety Checks – Each Time Initial Safety Checks Machine is Used Before the lathe is used for any machining Before beginning any cutting operation: operations, it should be checked for proper operation. Always wear industrial-quality safety glasses or use a safety face shield when Use the handwheels to move the carriage, operating the lathe.
  • Page 19 Never reach over or across the area of the rotating chuck or cutting tool. Never attempt to remove strands of material while the chuck is rotating. Stop the lathe, then use pliers to remove any excess material that could pose a hazard or obstruct the view of the work.
  • Page 20: Using The 3-Jaw Chuck

    Using the 3-Jaw Chuck A 5-inch 3-jaw chuck is included with the lathe. The chuck attaches to the spindle by three studs threaded into the back of the chuck which pass through corresponding holes in the spindle plate and are locked in place by nuts. Always ensure studs are properly threaded into Chuck Safety Shield the back of the chuck before mounting the...
  • Page 21 usually are stamped into the channel above #2 and jaw #3, then advance the jaws to make the teeth. Some chucks have corresponding sure that they all meet evenly at the center of numbers stamped into each slot of the chuck. the chuck.
  • Page 22: Basic Lathe Operations

    long life, particularly in high-volume industrial Basic Lathe Operations settings. They can be purchased in sets with a variety of commonly used shapes. The following procedures describe typical Cutting tools come many sizes sequences for setting up a workpiece for basic accommodate different sizes of lathes.
  • Page 23: Setting The Tool Height

    For the exercises in the following sections of this manual we will use a single HSS tool bit with an easily formed shape that be used both for facing and turning operations. The tool was ground on a bench grinder from a 5/16” square x 2 ½”...
  • Page 24: Quick Change Tool Posts

    Chatter will cause uneven variations in the surface of the workpiece which often are visible upon inspection. For the same reason the compound slide should be extended no more than necessary. The farther back it sits over the center of the compound, the more rigid is the setup.
  • Page 25: Rotational Speed Selection

    For most cutting operations on the SC4 lathe a speed of between 600 and 1200 RPM will work well, with lower speeds being used for harder materials and higher speeds for softer materials.
  • Page 26 position. The lathe will not start unless these conditions are met. 10. Turn on the power to the lathe if it is not already on, then press the green Start button on the control panel. Verify that the chuck rotating counterclockwise (Forward on the digital display).
  • Page 27: Cleaning Up A Facing Cut

    While the workpiece is still set up for a facing operation, we will next demonstrate the use of Filing the edge after facing the power cross-feed feature of the SC4. When the power cross feed lever is engaged, the Warning: Never use a file without a handle cross-slide is moved under power of the designed for that purpose.
  • Page 28 Auto Feed lever for several seconds until the leadscrew meshes with the power feed gear. The lever should then drop into the engaged position. 5. Push the handle of the X-Y Auto Feed lever to the left, then rotate it upwards to engage the power cross-feed.
  • Page 29: Center Drilling A Workpiece

    7. Set the rotational speed to about 600 RPM. Center Drilling a Workpiece Move your hands clear of the cross-feed Drilling into the end of a workpiece is another handwheel as it will rotate under power in the very common lathe operation. It is good next step.
  • Page 30: Drilling A Workpiece

    close to the end of the workpiece. Lock the Drilling a Workpiece tailstock in place. The procedure for drilling a hole into the 6. Check to make sure that the tailstock ram workpiece is similar to the center-drilling lock lever (located near the front of the operation except that the drilled hole usually is tailstock) is not in the locked (tightened) deeper.
  • Page 31 advanced into the workpiece is sufficient to do use leather gloves or pliers to remove sharp the job. metal shards. 11. Apply a few drops of cutting fluid to the tip 1. Mount a ¼” diameter drill bit in the tailstock of the drill bit.
  • Page 32: Turning A Workpiece

    Turning a Workpiece Turning is the process of removing material from the outside surface of a cylindrical workpiece to reduce its diameter. This might be done, for example, to form the end of a shaft to fit into a bearing. During a turning operation the cutting tool is advanced a small distance into the side of the 2.
  • Page 33: Turning With Power Feed

    20. When you are familiar with this process, move the carriage away from the end of the workpiece and press the Stop button. This process has reduced the diameter of the workpiece and produced a smooth even finish of a specific diameter. In actual operating practice, a digital caliper or micrometer would be used to check the diameter of the workpiece...
  • Page 34 carriage, and the leadscrew and may endanger divisions. This will set the tool for the next the operator. cutting pass. 10. Repeat steps 3 through 8 to make two Avoid distractions in the shop during power more passes along the workpiece. feed operations: control of the lathe requires your undivided attention! 11.
  • Page 35: Cutting Short Tapers

    6. Use the carriage handwheel and cross- Cutting Short Tapers slide handwheel to position the tip of the cutting tool near to the edge of the Short tapers, or bevels, made workpiece and drawn back about ½” advancing the tool using the compound towards the center of the workpiece face.
  • Page 36 Completed bevel cut At this point the next step would be to cut off and then face the unfinished end of the workpiece. The workpiece could be cut off using a cutoff tool or by removing it from the chuck and cutting it off using a hacksaw or metal-cutting band saw.
  • Page 37: Cutting Screw Threads

    A thorough discussion of screw threads and Cutting Screw Threads threading is beyond the scope of this manual. Consult the Internet or technical reference manuals for detailed information on these Screw threads often are most conveniently and subjects. quickly cut on the lathe using taps for internal threads and dies for external threads.
  • Page 38 Gear chart for inch threads Each box along the top of the chart shows the number of TPI: 8, 9, 10, etc. Below each TPI setting is a chart of four gear positions: A, B, C and D. The smaller numbers below each TPI setting designate the number of teeth on the gear at each position.
  • Page 39 various sizes of gears. In addition, the B-C gear. After meshing the gears, tighten the shaft can be moved in or out along the arm of 14mm bolt. the frame. Rotate the lathe chuck by hand to make sure that gears are properly meshed and turn without interference.
  • Page 40: Thread Cutting Exercise

    Thread Cutting Exercise 6. Hold the cross-slide handwheel in place and rotate the calibrated ring until it is set to “0”. For this exercise, select a piece of ¼” diameter stock at least 3-4” long and mount it in the 7.
  • Page 41 Use a ruler or a thread pitch gage to verify that The carriage is now positioned to begin cutting the grooves are spaced 20 per inch. If they are the thread. not, recheck and correct the gear setup. Note: the following sequence of steps must be followed carefully to cut a good thread.
  • Page 42 Thread gets deeper on each pass 11. Press the Stop button 12. Press the Reverse button ( 13. Press the Start button. 14. Allow the cutting tool to move past the right end of the workpiece. 15. Carefully use a file to slightly bevel the tip of the screw thread.
  • Page 43: Maintenance

    Maintenance Bare Metal Surfaces To ensure a long lifetime of safe and accurate operation, lubrication and adjustments must be Bare metal surfaces such as the table, carried out on a regular basis. dovetails and quill should be protected by wiping them periodically with a light coating of Periodic Lubrication oil to prevent rust.
  • Page 44: Appendices

    Appendices Appendix A – Specifications Lathe Swing over bed 8.27” (210 mm) Distance between centers 16.14” (410 mm) Spindle bore 0.79” (20 mm) Spindle taper MT #3 Tailstock taper MT #2 Spindle speed 0-2000 RPM Compound travel 3.50” (89 mm) Cross slide travel 4.50”...
  • Page 45: Appendix B - Parts Diagrams

    Appendix B – Parts Diagrams PDF created with pdfFactory Pro trial version
  • Page 46 PDF created with pdfFactory Pro trial version
  • Page 47: Appendix C - Parts List

    Appendix C – Parts List PDF created with pdfFactory Pro trial version
  • Page 48 PDF created with pdfFactory Pro trial version
  • Page 49: Appendix D - Circuit Diagram

    Appendix D – Circuit Diagram PDF created with pdfFactory Pro trial version
  • Page 50: Appendix E - Packing List

    Appendix E – Packing List PDF created with pdfFactory Pro trial version