Topic outline

  • Rafia Sultana

    Title of Course:

    Perform Lathe Operations

    NOMINAL HOURS: 50 Hours

    Course Summary:

    This unit covers the knowledge, skill, and attitude required to set up and turn workpieces to drawing specifications. It includes Face and turns external shapes (radii, cones), Multi-start external v-thread cutting, Cutting inside taper using taper turning attachment or offset tailstock and compound method, turning internal thread.

    Course Structure

    REQUIREMENT

    LATHE OPERATION

    COMPLETION

    OSH
    Practice Materials for the Lathe Job symbol
    • Multi-start external v-thread cutting
    • taper turning
    • turning internal thread
    Complete safe
    shutdown
    Housekeeping
    procedures

    Learning Outcome:

    • Identify how to perform the multi-start external v-thread cutting.

    • Identify how to perform a taper turning operation.

    • Identify how to perform turning internal thread operation.

    Teacher

    Rafia Sultana

  • PPE ( Personal Protective Equipment)

  • Drawings,cutting tolls,work piece

  • Lathe Accessories

    Lathe Accessories by Rafia Sultana

  • Measuring Tools

  • Lathe Operations

    1.Multi-start external v-thread cutting

    External Threads Formulas

    Picture

    1. Major Diameter: Given On Print (if it is a         machine screw #0-14 SEE NOTE 1A).

    2. Pitch: 1/number of threads per inch.
    3. Flat: pitch/8.

    4. Compound Movement: .75(pitch).

    5. Single Thread Height: .75(pitch) (cosine 30     degree's).

    6. Pitch Diameter: major diameter -   single thread height.

     

    Thread Cutting Procedure on Lathe Machine - mech4study

    2.Face and turn external shapes (radii, cones) operation

    3.Cutting inside taper using taper turning attachment

    or offset tailstock and compound method:

    Taper Turning Formulas

    Picture

    • When the feed is given to the tool, its cut at an angle to the axis of the workpiece produces a taper.
    1. You can calculate the set over the length with the formula:
    2. S=L*(D-d)/2l, l: taper length, L: total job length, d: smaller diameter, D: larger diameter.
    lathe
     

    4. Turning internal thread

    How to Cut an Internal Thread:
    1. Centering with a punch and then drill a core hole with the twist drill.
    2. Use the 90°countersink to countersink into the core hole and make a chamfer.
    3. Put the tap into a tap wrench and turn it into the core hole to cut the thread.

  • Course evaluarion