Ensure Geometric Accuracy Swiss-type lathes process long, slender workpieces with multi-axis synchronization. A bed inclination of only 0.02 mm/m creates a “slope error” along the Z-axis, tilting the tool relative to the part centerline. This results in taper on outer diameters and asymmetric thread profiles. Periodic re-verification and re-leveling restore overall geometric accuracy to factory standards, guaranteeing consistent dimensions during extended production runs.
Extend Guideway and Ball-Screw Life When the machine is not level, guideways carry uneven loads and lubricant films become discontinuous, accelerating localized wear and causing stick-slip or vibration. After re-leveling with shims or wedges, load distribution evens out, reducing guideway scoring and ball-screw side-loading. Service life typically improves by more than 20 %.
Suppress Thermal Growth and Vibration A tilted bed leads to asymmetric coolant and lubricant flow, generating thermal gradients. Subsequent expansion further amplifies geometric errors. Re-verifying level, combined with thermal compensation, produces a more uniform temperature rise and reduces scrap caused by thermal drift. Additionally, a level bed raises natural frequencies, cutting chatter amplitude and improving surface finish by half to one full grade.
4. Improve Tool-Changing and Sub-Spindle Docking Reliability Modern Swiss machines often include back-working spindles and B-axis driven tools. Level error introduces coaxial misalignment between turrets, tool arms, or sub-spindles, causing tool jams or collisions. Keeping level within 0.01 mm/m ensures repeatable positioning accuracy and reduces unplanned stoppages.
5. Lower Overall Operating Costs Accumulated geometric errors force operators to adjust tool offsets frequently and perform manual rework, increasing tool wear and inspection time. Periodic level checks shorten initial setup time by more than 30 % and hold scrap rates to a few parts per thousand, translating directly into higher profitability.
In short, level re-verification is a low-cost, high-return preventive measure that safeguards geometric accuracy, prolongs machine life, and lays the foundation for high-precision, high-volume continuous production.
