What is the process of threading in lathe machine?

Process of Threading in Lathe Machine

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Before understanding the process of threading in lathe machines, it is necessary to define what a thread is. In simple terms, a thread consists of "a series of crests and troughs" or "spiral grooves" created across a cylindrical or conical surface. Threading can serve various purposes, including being used as fasteners or acting as motion transmitters.

Understanding the Thread Basics

When discussing threading in lathe machines, a few terms are essential:

• Pitch: The distance between two corresponding points on adjacent threads, measured parallel to the cylindrical axis.
• Lead: The axial distance a thread advances during one complete revolution.
• Major Diameter: This is the largest diameter of the thread, measured across the crests.
• Minor Diameter: The smallest diameter measured across the roots of the thread.
• Threads per Inch: The count of threads that fit in one inch of length.
• Depth: The perpendicular distance between the crest and the root of the thread.

The Threading Process on Lathe Machines:

The process of threading in lathe machine begins with calculating the pitch, lead, and the diameters mentioned previously. A carbide insert turning tool is usually used for this operation. The steps are as follows:

1. The workpiece is first machined to match the major diameter of the desired thread.
2. The workpiece is secured in a chuck connected to a spindle, which is engaged with a lead screw.
3. Adjust the quick change gearbox to the required thread pitch.
4. Align the head using a thread gauge.
5. Utilize both compound feed and cross feed to bring the cutting tool into contact with the workpiece.
6. Ensure both feeds are set to zero on the micrometer.
7. The slide carriage moves as the lead screw rotates, engaging the half-nut at a properly calculated moment for accurate cutting.
8. Monitoring thread tool tracking guarantees accurate threading during this process.
9. When the adjust is made, proceed to cut the threads while ensuring to disengage the half-nut post-cut to reset for the next pass.
10. Continue until the final depth is approached or achieved within specified tolerances.

Post threading, it is crucial to check the pitch using a gauge to ensure accuracy. Finally, chamfer the edges of the threads to prevent any damage.

For additional resources, including a Thread Repairing Tool, please feel free to reach out.

For component specifics, refer to cnc lathe machining parts.