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LittleMachineShop.com HiTorque 7600 User Manual

9x20 bench lathe
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HiTorque ®
9×20 Bench Lathe User's Guide
Model 7600
from LittleMachineShop.com
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Summary of Contents for LittleMachineShop.com HiTorque 7600

  • Page 1 HiTorque ® 9×20 Bench Lathe User’s Guide Model 7600 from LittleMachineShop.com ®...
  • Page 2 (or see our website LittleMachineShop.com for more information). Your feedback is welcomed! © Copyright 2025 LittleMachineShop.com ® All rights reserved. Written by LittleMachineShop.com ® Version 1, February 2025 LittleMachineShop.com...

  • Page 3: Table Of Contents

    Facing ........................25 Facing with Power Feed ..................26 Turning Angles ......................27 Threading ......................28 Change Gears ...................... 28 Change Gear Tables ....................31 Making Left Hand Threads ..................33 Updated 2/28/2025 © 2024 LittleMachineShop.com Page 3 of 65...
  • Page 4 Compound Rest Nut ....................44 Apron Position ..................... 44 Tailstock Position ....................45 Half Nuts ......................45 Maintenance ......................46 Cleaning ......................46 Lubrication ......................46 Parts Diagrams: 7600 ....................48 Wiring Diagram ....................... 65 Updated 2/28/2025 © 2024 LittleMachineShop.com Page 4 of 65...

  • Page 5: Introduction

    This user’s guide covers the care and operation of the LittleMachineShop.com HiTorque 7600 9×20 Bench Lathe. This lathe is a version of the SIEG SC50 built to LittleMachineShop.com specifications. Be sure to read and understand the safety guidelines presented in this book before using your lathe.

  • Page 6: Safety Considerations

    Use appropriate cutting tools with appropriate feeds and speed.  Do not force or overload machinery.  Never leave a running machine unattended.  Cutting tools get hot during use and can cause burns if handled inappropriately. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 6 of 65...

  • Page 7: Lathe Safety

     Disconnect all components from the power receptacle before servicing.  In the event of a power outage, turn off all components to ensure that the machine does not restart unexpectedly. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 7 of 65...

  • Page 8: Specifications

    120 V 60 Hz 12 Amps Spindle motor output 1.34 hp (1000 Watts) Machine weight 254 lbs (115 kg) Overall dimensions 36" x 25" x 18" (910 mm x 630 mm x 450 mm) Updated 2/28/2025 © 2024 LittleMachineShop.com Page 8 of 65...

  • Page 9: Features

    3. Chuck 10. Apron 4. Carriage 11. Half nut lever 5. Cross slide 12. Power feed lever 6. Tool post 13. Bed ways 7. Compound rest 14. Lead screw (under cover) Updated 2/28/2025 © 2024 LittleMachineShop.com Page 9 of 65...

  • Page 10: Basic Accessories

    Open end wrenches: 8 x 10 mm, 14 x 17 mm, and 17 x 19 mm  Hex wrenches: 2.5, 3, 4, 5, and 6 mm  Mounting bolts and washers Updated 2/28/2025 © 2024 LittleMachineShop.com Page 10 of 65...

  • Page 11: Lathe Setup

    2. Cutting tools and turning stock are installed and tightened. 3. There are no clamps or locks on moving parts. 4. The speed control knob is set for the lowest speed. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 11 of 65...

  • Page 12: Mounting Your Lathe

    Mount the lathe to the workbench with M8 (or 5/16") bolts. Use fender washers on the underside of wooden benches to prevent the bolt heads from pulling through. If you have the chip tray, its mounting dimensions are shown below. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 12 of 65...

  • Page 13: Lathe Controls

    Start, the spindle turns in the default forward direction—the direction used for normal turning. Press the button to toggle between forward and reverse directions. The button illuminates to indicate reverse direction. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 13 of 65...
  • Page 14 End of day:  Press the red E-stop button to power off machine. To stop the lathe in an emergency:  Press the red E-stop button. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 14 of 65...
  • Page 15 Speed Ranges The HiTorque 7600 and 7650 Bench Lathes incorporate a two-speed belt drive system that provides an extended speed range as well as very quiet operation. The speed range is changed by moving a V-belt between two sets of pulleys. When the belt is on the large motor pulley and the smaller spindle pulley, it is set for high-speed operation.

  • Page 16: Carriage And Cross Feed Controls

    Pull the hand wheel towards you to disengage it when you are using power feed. There are 40 divisions on the dial. Each turn of the handle advances the cross slide 0.080". Updated 2/28/2025 © 2024 LittleMachineShop.com Page 16 of 65...
  • Page 17 3. Tighten the two socket head cap screws. Chris’ Tip: For accurate work, use a protractor between the compound rest and the cross slide. Don’t depend on the markings on the side of the compound rest. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 17 of 65...
  • Page 18 Slightly rotate the carriage hand wheel or cross slide hand wheel back and forth until gears and lead screw mesh. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 18 of 65...

  • Page 19: Tailstock Controls

    Turn the lever clockwise to lock the tailstock quill, and counterclockwise to unlock the tailstock quill. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 19 of 65...

  • Page 20: Lathe Work Holding

    Tighten the nuts to lock the chuck in place. Removing the chuck is the opposite procedure. You will likely have to tap the chuck off with a plastic dead-blow hammer or mallet. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 20 of 65...

  • Page 21: Changing Chuck Jaws

    8. While pressing jaws 2 and 3 into the slots, turn the chuck key to close the chuck. Make sure all jaws close together. If one or more is not aligned, open jaws till disengaged and repeat process. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 21 of 65...

  • Page 22: Mounting Work In A 3-Jaw Chuck

    10. Adjust the jaw that is aligned with the dial indicator plunger and the opposite jaw so the indicator reads zero. Check your work by rotating the chuck. If you are not happy with the result, repeat steps 3 through 8. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 22 of 65...

  • Page 23: Lathe Tooling

    Use shims to adjust height and when exactly the same height, rotate the turret back and then tighten locking lever. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 23 of 65...

  • Page 24: Lathe Operations

    4. Move the carriage so that the tool bit is near the right end of the work piece. 5. Turn the lathe on and adjust the speed to an appropriate speed for the diameter and material on which you are working. The LittleMachineShop.com website has a calculator to help you determine appropriate cutting speeds at https://littlemachineshop.com/speeds.

  • Page 25: Turning With Power Feed

    4. Move the carriage to the right so that the tool bit is past the right end of the work piece. 5. Turn the lathe on and adjust the speed to an appropriate speed for the diameter and material on which you are working. The LittleMachineShop.com website has a calculator to help you determine appropriate cutting speeds at https://littlemachineshop.com/speeds.

  • Page 26: Facing With Power Feed

    You do not need to pull on the ball to disengage, simply move the lever and the cross slide stops. 6. Be sure to back out the compound rest a small amount before returning cross slide to starting point to avoid marking workpiece. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 26 of 65...

  • Page 27: Turning Angles

    For longer tapers, the work is usually placed between centers with the tail center offset from the centerline of the lathe or by using a Taper Turning attachment. Taper(example) Chamfer(example) Tapered Arbor Taper Turning Attachment Updated 2/28/2025 © 2024 LittleMachineShop.com Page 27 of 65...

  • Page 28: Threading

    C. Gear positions B and C are on the same shaft; between positions A and D. Position C is the outside gear on this shaft. D. Position D is the end of the lead screw. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 28 of 65...
  • Page 29 Position B is an idler and does not affect the overall gear ratio. The table shows a gear that makes it easy to properly engage the gears, although you can use any gear in position B as well. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 29 of 65...
  • Page 30 B-C shaft to loosen it in the slot in the arm. Move the gears so they are all engaged. Tighten the arm around the lead screw and tighten the B-C shaft. Updated 2/28/2025 © 2024 LittleMachineShop.com Page 30 of 65...

  • Page 31: Change Gear Tables

    Change Gear Tables Inch Threads – Right Hand Inch Threads – Left Hand 11.5 11.5 Updated 2/28/2025 © 2024 LittleMachineShop.com Page 31 of 65...
  • Page 32 Metric Threads – Right Hand Metric Threads – Left Hand Pitch Pitch 0.25 0.25 0.35 0.35 0.45 0.45 0.75 0.75 1.25 1.25 1.75 1.75 Updated 2/28/2025 © 2024 LittleMachineShop.com Page 32 of 65...

  • Page 33: Making Left Hand Threads

    Making Left Hand Threads You can make left hand threads with this lathe by changing one gear. Move the driver gear from the idler shaft to the drive shaft and also swap the spacer. This will cause the spindle and the lead screw to rotate in opposite directions.

  • Page 34: Compound Angle

    Compound Angle Set the compound rest at a 29.5° angle from a line perpendicular to the axis of the lathe. This allows you to advance the tool with the compound rest. At this angle the tool cuts only on the left side of the thread form.

  • Page 35: Threading Process

    4. Secure the tool bit in position. 5. Advance the tool bit until the point just contacts the work piece. 6. Zero the cross slide dial by holding the cross slide feed handle and rotate the graduated dial. Threading Process It takes several passes to cut a thread to full depth.

  • Page 36: Common Accessories

    You will soon find that the purchase of a lathe is just an initial step. There are many tools and accessories that you will need to get full use from your lathe. LittleMachineShop.com carries a full selection of accessories. The following are some common accessories used with the bench lathe, a small sampling of the complete LittleMachineShop.com line.

  • Page 37: Indexable Turning Tools

    It can hold larger work than the same size 3-jaw chuck. You can offset work in a 4- jaw chuck by clamping it off center. LittleMachineShop.com part number 2338. 5 inch, 4-jaw chuck. Each jaw is independently adjustable and reversible.

  • Page 38: Faceplate

    A faceplate allows you to mount work that can’t be held in a chuck. You can bolt odd-shaped work pieces to the faceplate. LittleMachineShop.com part number 2499. Faceplate for the HiTorque Bench Lathe. The faceplate is 8.66" in diameter and has 8 slots for mounting work.

  • Page 39: Steady Rest And Follower Rest

    A follower rest mounts on the carriage and moves with the cutting tool, providing support where it is needed. The steady rest is LittleMachineShop.com part number 6722. The steady rest can support work up to 2.2" in diameter. The follower rest is LittleMachineShop.com part number 6723.

  • Page 40: Grinding Tool Bits

    Grinding Tool Bits When you purchase a new lathe tool bit, it might have an angle on the end, but it is not properly sharpened for turning. Grinding lathe tool bits is a bit of an art. It takes some practice to get good at You need to create a cutting edge that is sharp, extends out so that the cutting edge and not the side of the tool contacts the work, but that still has enough support to maintain sufficient strength to cut metal.

  • Page 41: How To Grind Tool Bits

    Side relief Side relief provides clearance for the side cutting edge. Without side relief, the side of the tool bit would hit the work piece and not allow the cutting edge to penetrate the work piece. Back rake The back rake produces the front cutting edge that cuts into the work piece. Front relief Front relieve provides clearance for the front cutting edge.

  • Page 42: Lathe Adjustments

    Lathe Adjustments Keeping your lathe in adjustment is an ongoing process. You should check all the following adjustments when you set up your lathe and then periodically as you use your lathe. Looseness in the carriage retaining plates or the gibs can cause chatter when you are using the lathe. If you experience chatter, check all these adjustments.

  • Page 43: Cross Slide Gib

    Cross Slide Gib Compound rest gib adjusters Cross slide gib adjusters To adjust the cross slide gib: 1. Loosen the three lock nuts on the side of the cross slide. 2. Slightly loosen all three set screws on the side of the cross slide. 3.

  • Page 44: Compound Rest Nut

    3. Snug each set screw equally. This will lock the compound rest in position. 4. Loosen each set screw 1/8 turn to allow the compound rest to move. 5. While holding the set screws from turning, tighten the lock nuts. 6.

  • Page 45: Tailstock Position

    Tailstock Position The tailstock is adjustable from front to rear so you can align it with the spindle. Tailstock adjustment set screw Tailstock locking set screw To adjust the tailstock position: 1. Remove the 3-jaw chuck from the lathe spindle. 2.

  • Page 46: Maintenance

    Where oil is required, we recommend Mobil Vactra Oil No. 2, an oil specially designed for machine tool way lubrication and bearing lubrication. Chris’ Tip: Mobil Vactra Oil No. 2 is available from LittleMachineShop.com (part number 6385). If you prefer to purchase locally, get Mobil 1 synthetic motor oil, any viscosity, available at most auto parts stores.
  • Page 47 Location Lubricant Frequency Notes Cross slide Every 8 hrs of Advance the cross slide to the extent of its travel. dovetail Apply oil to the end of the gib and the ends of the dovetails. Retract the cross slide. Oil fittings Every 40 hrs There are several oil fittings on the lathe.

  • Page 48: Parts Diagrams: 7600

    Parts Diagrams: 7600 Drawing 1 of 10...
  • Page 49 Parts for Drawing 1 of 10 Part Part Tailstock Casting 1-20 Set Screw, M8x14, Socket Flat Point Quill 1-21 Handwheel, Tailstock Locking Axis, Tailstock 1-22 Nut, M6 Locking Lever, Tailstock 1-23 Set Screw, M6x16, Socket Dog Point Adjusting Washer, Tailstock 1-24 Handle, Handwheel Retainer, Tailstock Feed Screw...
  • Page 50 Model 7600 Drawing 2 of 10...
  • Page 51 Parts for Drawing 2 of 10 Part Part Base, Compound Rest 2-20 Washer, M8 Flat Mounting Disc, Compound Rest 2-21 Handle, Tool Post Compound Rest Top 2-22 Cap Screw, M6x25, Socket Head Tool Post 2-23 Handwheel, Compound Rest Tool Post Mount 2-24 Handle, Handwheel, Chrome Adjusting Washer...
  • Page 52 Model 7600 Drawing 3 of 10 Parts for Drawing 3 of 10 Part Part Bed Way 3-16 Screw, M4x6 Pan Head Phillips Machine Lead Screw 3-17 Leadscrew Protection Cover Rack 3-18 Screw, M4x8 Flat Head Phillips Machine Copper Cover, Lead Screw 3-19 Key, 4x16 mm Washer, Lead Screw...
  • Page 53 Model 7600 Drawing 4 of 10...
  • Page 54 Parts for Drawing 4 of 10 Part Part Headstock Casing 4-15 Magnet, 6mm x 4mm Spindle Bearing Retainer, Outer 4-16 Set Screw, M6x8, Socket Flat Point Spindle Bearing Retainer, Inner 4-17 Bearing, Tapered Roller 32008 Headstock Cover 4-18 Bearing, 6007-2RS Ring, Spindle 4-19 Nut, Spindle M33x1.5...
  • Page 55 Model 7600 Drawing 5 of 10...
  • Page 56 Parts for Drawing 5 of 10 Part Part Saddle 5-22 Cap Screw, M4x30, Socket Head Cross Slide 5-23 Cap Screw, M5x30, Socket Head Feed Screw, Cross Slide, 20TPI 5-24 Screw, M3x12, Pan Head Phillips Machine Nut, Feed Screw Cross Slide 5-25 Protection Cover Cover, Saddle...
  • Page 57 Model 7600 Drawing 6 of 10...
  • Page 58 Parts for Drawing 6 of 10 Part Part Sleeve, Gear Shaft 6-43 Block Gear, Saddle Drive 6-44 Controlling lever Sleeve, Gear Shaft 6-45 Pressure spring Gear Shaft, Saddle Drive 6-46 Cap Screw, M4x40, Socket Head Gear Protection Sleeve, Carriage 6-47 Hand wheel Handwheel Gear Shaft I, 19 Teeth, Carriage...
  • Page 59 Model 7600 Drawing 7 of 10...
  • Page 60 Parts for Drawing 7 of 10 Part Part Back plate of gear box 7-20 Nut, M8 Gear Lever 7-21 Washer, M6 Flat Gear, 120 Teeth 7-22 Cap Screw, M6x10 Hex Socket Button Head Shaft, Change Gears 7-23 Screw, M4x10 Flat Head Phillips Machine 7-24 Washer, M4 Lock Bushing...
  • Page 61 Model 7600 Drawing 8 of 10 Parts for Drawing 8 of 10 Part Part Motor, 1000 Watt Brushless 8-14 Washer Cap Screw, M5x20, Socket Head 8-15 Washer Washer, M5 Spring Lock, Thin 8-16 Sleeve Key, 5x25 mm 8-17 Bearing, 6001-2RS Nut, Hex Thin Chamfered M5 8-18 Retaining Ring, M28 Internal...
  • Page 62 Model 7600 Drawing 9 of 10...
  • Page 63 Parts for Drawing 9 of 10 Part Part Safety Switch 9-30 LED light panel Strain Relief, 12 mm 9-31 Screw, Tapping M2.9x9.5 Flat Head Phillips Screw, M4x30 Pan Head Phillips Machine 9-32 Upper electrical box Screw, M4x8 Pan Head Phillips Machine 9-33 Faceplate, Control Panel Plastic Tube, Electrical Box...
  • Page 64 Model 7600 Drawing 10 of 10 Parts for Drawing 10 of 10 Part Part 10-1 Rear Splashguard 10-3 Washer, M5 Flat 10-2 Cap Screw, M5x10 Hex Socket Button Head...

  • Page 65: Wiring Diagram

    Wiring Diagram...

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