Lathe Machine Parts and Working in Hindi

Lathe Machine Parts and Working

A lathe is a foundational machine tool used to remove material from a workpiece until it reaches the required shape and size. Its basic operating principle is that the workpiece rotates while a cutting tool is fed against it. The instructor describes the lathe as the “mother” or “father” of machine tools and highlights its role in industrial production and precision manufacturing.

Basic Operation and Requirements

For effective cutting:

• The cutting tool must have a sharp edge and be made of material harder than the workpiece.
• The workpiece and tool must both be held securely.
• There must be relative motion between them. In a typical lathe operation, the workpiece rotates while the tool is fed toward or along it.

The video demonstrates a three-jaw chuck, whose jaws move together when tightened to grip the workpiece. It also shows facing, step cutting, taper turning, and drilling with equipment held in the tailstock.

Main Parts of the Lathe

• Bed: The heavy base of the machine, supporting the headstock, tailstock, and carriage. The instructor describes it as generally made from grey cast iron, whose graphite flakes help absorb vibration. V-shaped and flat guideways direct the movement of the carriage and tailstock; the ways are described as flame-hardened.
• Headstock: Fixed at the left end of the bed. It houses the spindle and drive arrangements, including gears and pulleys, which transmit rotation and allow speed changes. The chuck or another work-holding device is mounted on the spindle.
• Tailstock: Positioned on the right side of the bed and movable along its guideways. It can support long workpieces and hold tools such as drills. The instructor also mentions its use for reaming, tapping, and boring, and demonstrates offsetting it to help produce a taper.
• Carriage: Supports and moves the cutting tool. Its main parts include:
  • Saddle: Travels lengthwise along the bed, parallel to the workpiece.
  • Apron: Located at the front of the carriage; contains controls and mechanisms for carriage movement and power feed.
  • Cross-slide: Moves the tool across the workpiece, perpendicular to its axis, allowing the operator to adjust the depth of cut and the workpiece’s diameter.
  • Compound rest (compound slide): Can be set at an angle for angled cuts and taper turning.
  • Tool post: Holds the cutting tool.

Tool and Carriage Motions

The instructor emphasizes three principal directions of tool movement:

1. Longitudinal motion: The saddle moves the tool parallel to the workpiece.
2. Transverse motion (cross-feed): The cross-slide moves the tool perpendicular to the workpiece’s axis.
3. Angular motion: The compound rest is set at an angle to produce angled cuts or tapers.

Operations Shown or Discussed

• Facing: The tool cuts across the end of the rotating workpiece.
• Step cutting or turning: Different sections of the workpiece are cut to different diameters.
• Taper turning: A conical surface is produced by angling the compound rest or offsetting the tailstock.
• Drilling: A drill held in the tailstock is fed into the rotating workpiece.
• Other tailstock-supported operations: Reaming, tapping, and boring.

Lathe Specifications

The instructor lists these measures for specifying or selecting a lathe:

1. Height of the center above the bed.
2. Maximum swing over the bed.
3. Maximum swing over the carriage.
4. Maximum swing over the gap.
5. Distance between centers.
6. Length of the bed.
7. Available spindle speeds and feeds.

The instructor highlights the distance between centers and swing over the bed as especially common measures to consider.

Historical Note

The instructor discusses early steam-engine-driven lathes and says the machine is also called an engine lathe or center lathe. The subtitle’s wording about the inventor and date is unclear, so that historical detail should not be treated as verified.

Speakers and Sources Featured

• Instructor/presenter: Explains the lathe’s principle, parts, motions, operations, and specifications.
• Machine demonstrations and animations: Illustrate chuck operation, cutting motions, drilling, taper turning, and lathe components. No additional named speakers are identifiable in the subtitles.