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Jesco PRINCE - User Manual

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®
High Speed Precision Lathes
PRINCE
INSTRUCTION & PARTS MANUAL
(Original instructions)
JESCO MACHINERY LTD.
P.O. BOX 14-9, TAIPING,
TAICHUNG, TAIWAN, R.O.C.
TEL: 886-4-22702676
FAX: 886-4-22706295
E-MAIL: jesco1@ ms22.hinet.net
Web Site: www.jesco.com.tw
File No. Rev. Date Editor Approval Comments
JCET-0001 01 2009.10 Ken.

Questions and Answers

  • B
    bnicholsonSep 12, 2025
    What to do if my Jesco PRINCE has wrong rotation?
    • J
      Johnathan FischerSep 12, 2025
      If your Jesco Lathe has the wrong rotation, it's likely due to the wrong sequence of phases. Reverse any two leads connecting for the motor to correct this.
  • W
    wrobersonAug 25, 2025
    What to do if my Jesco PRINCE motor is overheating?
    • T
      Thomas KellerAug 26, 2025
      If your Jesco Lathe motor is overheating, consider these potential causes: Excess belt tension (adjust the belt tension). A cooling fan failure (check the fan for proper operation). A badly worn bearing (replace the bearing). Short grease in bearing (replenish grease). Overload (reduce cutting speed or feed rate). Incorrect speed range running continuously (change the speed range and adjust the speed select knob).
  • D
    Derek WilsonAug 26, 2025
    Why is my Jesco PRINCE leaking oil?
    • J
      Joseph WrightAug 26, 2025
      Oil leakage in your Jesco Lathe could be due to several reasons: The plug of the drain isn't tight (reseal and tighten it). The case is cracking (it needs to be repaired by special welding). There's leakage from the overflow (tighten the cover screws). The packing or gasket is damaged (replace the packing or gasket). Or there's leakage from the overflow on the spindle bearing housing (reduce oil flow to the bearing or enlarge oil return flow).
  • M
    Melissa NelsonAug 27, 2025
    Why is my Jesco Lathe coolant pump failing?
    • J
      john29Aug 27, 2025
      A failing coolant pump on your Jesco Lathe could be due to several reasons: Wrong rotation (reverse any two leads to the pump). Not enough coolant or a return filter obstructed (replenish coolant or clean the return filter in the chip tray). Overload relay off (reset the overload relay).
  • A
    Adam TaylorAug 29, 2025
    What to do if my Jesco PRINCE Lathe fails to start?
    • D
      Dr. Lacey WilsonAug 29, 2025
      If your Jesco Lathe fails to start, check the following: The circuit might not be complete (check the switch, leads, fuse, etc., and replace or reconnect properly). The power may be off (check the cable connection). The overload relay may be off (reset the overload relay).
  • V
    Vicki WilliamsAug 31, 2025
    Why is my Jesco Lathe motor noisy and vibrating?
    • E
      Erin GonzalesAug 31, 2025
      If your Jesco Lathe's motor is noisy and vibrating, consider the following potential causes: The motor is loosely mounted (tighten the mounting bolts). The mounting frame is strained (stiffen the mounting place or add shims under the foot pad). The motor shaft is bent or sprung (straighten or replace it). The foundation is inadequate or the motor feet are uneven (shim the motor feet for equal mounting).
  • Z
    zburnsNov 20, 2025
    Why is my Jesco PRINCE making excess noise or vibration?
    • M
      Molly PorterNov 20, 2025
      Excess noise or vibration in your Jesco Lathe can stem from several issues. It could be due to a badly worn bearing (requiring replacement), lost leveling (necessitating a recheck and tightening), or worn V-belts (which should be replaced). Other potential causes include loose belt tension (adjust it), a worn gear (replace it), a bent or sprung shaft (straighten or replace it), or a loosened pulley (tighten the set screw). Also, check if the workpiece clamp is loose (tighten it), the bearing thrust is too loose (tighten the end thrust nut), the headstock isn't tight on the bed (tighten the fixed screws), there's excess clearance between the carriage and bed (adjust the gib and tighten the back clamp), or there's excess clearance in the cross or compound slide (adjust the taper gib). Cuttin...
  • B
    bushdanaSep 14, 2025
    What causes a fail lubricant on slide way of my Jesco PRINCE Lathe?
    • R
      Rodney TurnerSep 14, 2025
      Failure of lubricant on the slide way of your Jesco Lathe is caused by oilers obstructed by dirty or damaged. Replace the oilers.
  • A
    Austin FischerSep 9, 2025
    What causes misalignment of chuck with spindle nose on my Jesco PRINCE Lathe?
    • A
      Alexis StewartSep 9, 2025
      Misalignment of the chuck with the spindle nose on your Jesco Lathe is caused by incorrect position of cam. Adjust the cam and lock it in proper position.
  • T
    Tina CoxSep 6, 2025
    What to do if my Jesco Lathe is showing failure on power feeding?
    • A
      alexanderbrettSep 6, 2025
      If you're experiencing failure on power feeding with your Jesco Lathe, here are a few things to check: The half-nut lever not disengage at all (disengage half-nut lever exactly). Feeds change lever incorrect positioning (push-in or pull-out the lever exactly). The safety latch and interlock pin failure (replace the safety latch or interlock pin).

Summary

Operator Qualifications and Safety

Operator Training and Skill Requirements

Details necessary qualifications and training for operators.

Environmental Protection Guidelines

Guidelines for handling hazardous substances and environmental safety.

Machine Usage and Limitations

Expected Use and Prohibited Applications

Defines the intended applications and prohibited uses of the lathe.

Operating Environment and Power

Environmental and Operating Conditions

Specifies ambient temperature, humidity, altitude, and atmospheric conditions for operation.

Electrical Power Supply Specifications

Outlines voltage, frequency, harmonic distortion, and interruption tolerances for the power supply.

Machine Technical Specifications

Detailed Machine Specifications

Lists detailed technical data including dimensions, capacities, and performance metrics.

Standard Included Equipment

Details the items included with the lathe as standard.

Optional Equipment List

Lists additional items available for purchase with the lathe.

Lathe Dimensional Drawings

Conventional Lathe Overall Diagram

Provides a visual representation with key dimensions for conventional lathes.

Tooling and Accessories

Tool Information Details

Details specifications related to tool shanks, tailstock drills, and maximum weights.

Unpacking and Lifting Procedures

Pre-Lifting Safety Notes

Provides safety notes and weight information for lifting the machine before unpacking.

Wooden Case Unpacking Instructions

Step-by-step instructions for safely opening and removing the machine from its shipping case.

Transport and Lifting Equipment

Forklift Truck Capacity Requirements

Details the capacity of forklifts required for safe lifting and transport of the machine.

Lifting Safety and Procedures

Lifting Preparation and Safety Checks

Covers pre-lift checks, equipment requirements, and safety precautions.

Safe Lifting the Machine

Instructions on how to lift the lathe using hoists/cranes, emphasizing slow and steady movement.

Warning Against Unauthorized Lifting

Highlights dangers of improper lifting by non-certified personnel.

General Operating Safety

Mandatory Operating Safety Precautions

Lists essential safety rules and guidelines for operating the lathe.

Noise Level Information

Machine Noise Level Measurement

Provides the equivalent A-weighted sound pressure level and notes on exposure evaluation.

Hazardous Operations Safety

Emery Cloth Usage Hazards

Details hazards associated with using emery cloth and necessary precautions.

Safe Emery Cloth Techniques

Recommended Emery Cloth Application Methods

Describes recommended methods and warnings for using emery cloth on rotating components.

Lathe Controls and Operation

General Operation of the Lathe

Introduces the general operation of the lathe with a diagram and legend.

Machine Installation Requirements

Foundation Plan Details

Illustrates the required foundation layout and dimensions for machine placement.

Machine Securing Procedures

Anchor Bolt Installation Diagram

Shows the diagram and details for anchor bolt installation for securing the machine.

Extraction System Integration

Connecting the Extraction System

Illustrates how to connect the lathe to an extraction system.

Identifying Danger Zones

Hazardous Region Illustration

Identifies and illustrates the danger areas and moving parts on the lathe.

Safety Device Functionality

Safety Device Locations and Types

Shows the location and function of safety devices like power switch and door interlocks.

Machine Guarding Standards

Discusses the importance and design of chuck and chip guards for risk reduction.

Warning Labels and Signs

Position and Meaning of Warnings

Indicates the placement and meaning of various warning labels and signs on the machine.

Cleaning and Leveling Instructions

Lathe Cleaning and Leveling Guide

Provides instructions for cleaning, leveling, and preparing the lathe for use.

Electrical Connections Guide

Connecting to the Electric Supply

Details the procedures and precautions for connecting the machine to the electrical supply.

Lubrication Procedures and Checks

Lubrication Requirements and Checks

Explains the importance of lubrication and outlines checks for headstock, gearbox, and apron.

Chuck Mounting and Workholding

Mounting Chucks and Faceplates

Instructions on how to properly mount chucks and faceplates onto the spindle nose.

Chuck Jaw Design Guidelines

Chuck Jaw Dimensional Details

Provides guidelines and dimensions for designing and using top jaws for workholding.

Lathe Control Systems

Identification of Lathe Controls

Identifies the main control levers and their functions on the lathe.

Control Panel Functionality

Explains the operation of buttons, knobs, and indicators on the control panel.

Spindle Speed and Braking

Standard Lathe Speed Controls

Details how to select spindle speeds and control rotation for standard models.

Footbrake Operation and Safety

Explains the function and operation of the footbrake for stopping the spindle.

Varispeed Lathe Operation

Varispeed Spindle Speed Adjustment

Describes how to adjust spindle speeds using the varispeed system.

Varispeed Footbrake Functionality

Explains the footbrake function for varispeed models.

Quick Change Gearbox

Quick Change Gearbox Operation Guide

Details the mechanism and charts for setting feeds and threads using the quick change gearbox.

Gearbox Selection Charts

Metric and Universal Gearbox Charts

Provides charts for setting metric and universal gearboxes for threads and feeds.

Carriage, Feed, and Threading

Carriage Assembly Function

Explains the role of the carriage in supporting the cutting tool and moving it.

Power Feed Engagement and Use

Details how to engage and operate longitudinal and cross power feeds.

Threading Dial Indicator Usage

Explains the function and usage of the threading dial for accurate thread cutting.

Tooling, Tailstock, and Tapers

Four-Way Toolpost Usage

Describes how to change tools using the four-way toolpost.

Tailstock Locking and Adjustment

Covers the function, locking, and adjustment of the tailstock.

Taper Attachment Setup

Explains the setup and use of the taper attachment for cutting tapers.

Machine Adjustment Procedures

Headstock Alignment Adjustment

Instructions for aligning the main spindle centerline with the bedway.

Spindle Bearing Tightness Adjustment

Details how to adjust spindle bearings for proper tightness.

Knob Operation Set Spring Adjustment

Explains how to adjust set springs for smooth knob operation.

Component Adjustment and Repair

Camlock Component Replacement

Steps for replacing or replenishing camlock components.

Leadscrew Loose Status Correction

How to correct loose status of the leadscrew.

Half-Nut Wear Adjustment

Procedures for adjusting or replacing worn half-nuts.

Fine Tuning Adjustments

Apron Hand Wheel Clearance Adjustment

How to adjust clearance for the hand wheel on the apron.

Cross Slide Screw Backlash Fix

Procedures for adjusting backlash in the cross slide screw.

Carriage Clamp Adjustment for Leveling

How to adjust the carriage back clamp for precise leveling.

Alignment and Fluid Management

Cross and Compound Slide Adjustment

Adjusting the cross slide and compound slide for smooth movement.

Tailstock and Spindle Alignment

How to align the centerline of the tailstock and main spindle.

Tailstock Clamp Handle Lever Adjustment

Adjusting the tailstock clamp handle lever for stability.

Coolant Level Monitoring

Instructions for checking and replenishing the coolant level.

Preventive Maintenance Schedule

Daily Machine Inspection Procedures

Daily checks before and after starting the motor, and during operation.

Weekly Maintenance Checks

Weekly checks for lubricating system, coolant system, and transmission.

Monthly Maintenance Tasks

Monthly checks for cleaning, electrical system, and vibration/leveling.

Periodic Maintenance Tasks

Semi-Yearly Inspection Details

Detailed inspections and checks to be performed every six months.

Yearly Inspection Requirements

Annual inspections including repainting and checking exposed parts.

Troubleshooting Common Issues

Headstock Bearing Overheating Causes

Probable causes and remedies for headstock bearing overheating.

Addressing Oil Leakage Problems

Common causes and solutions for oil leakage problems.

Resolving Noise and Vibration Issues

Identifies causes and solutions for excess noise or vibration from the machine.

Advanced Troubleshooting Guide

Workpiece Cutting and Accuracy Problems

Addresses problems like bending during long workpiece cutting and product accuracy failures.

Control and Threading Troubleshooting

Solutions for uneasy lever operation, chuck misalignment, and threading difficulties.

Systemic Failures Troubleshooting

Troubleshooting for tailstock clamp instability, foot brake, power feeding, and slide way lubrication.

Comprehensive Troubleshooting

Machine Start and Speed Troubleshooting

Diagnoses problems related to starting the machine and incorrect spindle speed.

Motor and Coolant Pump Issues

Covers motor noise, vibration, overheating, and coolant pump failures.

Inverter, Circuit, and Rotation Problems

Troubleshooting for inverter alarms, circuit issues, and wrong rotation.

Jesco PRINCE Specifications

General IconGeneral
BrandJesco
ModelPRINCE
CategoryLathe
LanguageEnglish