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Home / News / Industry News / What are the typical tolerances achievable on large-diameter rolls using a digital display roll lathe?
Author: DINGSHUN Date: May 23, 2025

What are the typical tolerances achievable on large-diameter rolls using a digital display roll lathe?

The typical tolerances achievable on large-diameter rolls using a digital display roll lathe depend on multiple factors, including machine rigidity, operator skill, tooling condition, and the precision of the digital readout system. However, in general industry practice, the following tolerances can be expected:

1. Diameter Tolerance

  • Typical Range: ±0.02 mm to ±0.05 mm

  • High-Precision Range (with optimal setup and tooling): ±0.01 mm

  • Influencing Factors:

    • Digital display resolution (often 0.01 mm or finer)

    • Wear and backlash in the lead screws and slides

    • Material type and cutting force dynamics

2. Roundness Tolerance

  • Typical Range: 0.01 mm to 0.03 mm TIR (Total Indicator Reading)

  • Dependent On:

    • Chuck and tailstock alignment

    • Spindle concentricity

    • Tool rigidity and vibration damping

3. Surface Finish

  • Typical Achievable Finish: Ra 1.6–3.2 µm (machined finish)

  • Improved Finish (with carbide or CBN tooling and controlled feed): Ra 0.8 µm or better

  • Note: Finish quality is not directly controlled by the digital readout, but the precision depth control enabled by the digital display helps maintain consistent feed and depth of cut.

CA8450 High-efficiency Automatic Digital Display Roll Lathe

4. Taper and Straightness

  • Taper Control: Within 0.01 mm over 1 meter is achievable with careful adjustment and accurate indication

  • Straightness Over Length:

    • Typically within 0.02 mm/m

    • Influenced by bed alignment, roll support (steady rests), and thermal growth

5. Axial Positioning

  • Axial Length Control (shoulder/step features): ±0.02 mm to ±0.05 mm depending on machine scale resolution and backlash compensation

Key Limitations

While digital display roll lathes offer accurate readout of axis positions, they lack automatic feedback correction found in CNC systems. Therefore, tolerances are more reliant on:

  • Manual operator adjustments

  • Mechanical integrity of the machine

  • Consistency in tool setup and wear management

Conclusion

A well-maintained digital display roll lathe operated by skilled personnel can consistently achieve:

  • Dimensional tolerances: ±0.02–0.05 mm

  • Roundness and straightness: within 0.01–0.03 mm

  • Surface finish: Ra 1.6–3.2 µm, or better with optimized tooling

For tighter tolerances, CNC roll lathes or hybrid digital-CNC systems may be more suitable.

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