Key Points for Machine Tool Frame Selection

Key Points for Machine Tool Frame Selection

Organized according to six critical criteria: rigidity, accuracy, structure, process, compatibility, and after-sales service. Direct comparison can be made for selection.

①

Rigidity and Load Capacity (Core Factor)

  • Bed Material: Prioritize HT250 and HT300 cast iron. Higher-grade materials feature better rigidity and stronger vibration resistance.
  • Casting Weight: For frames of the same model, heavier weight generally means better rigidity; avoid thin-walled, lightweight downgraded versions.
  • Guideway Span: Larger span and lower center axis ensure more stable cutting, suitable for heavy cutting.
  • Spindle Bore / Taper – Turning: 42/52/63/80mm bore. Larger bore provides stronger bar capacity.
  • Machining Centers: BT40 for general use; BT50 suitable for heavy cutting.
②

Accuracy Indicators (Directly Determine Machine Tool Grade)

  • Positioning accuracy and repeat positioning accuracy
  • Table surface flatness, spindle radial runout, axial end play
  • Guideway straightness, assembly accuracy of ball screws and guideways
  • Match with customer product requirements: economic type / precision type / high-precision type.
③

Structure Type (Determine Applicable Processes)

CNC Lathe Frame

  • Flat Bed: Low cost, average rigidity, suitable for simple machining.
  • Inclined Bed (30°/45°/60°): Excellent chip removal, strong rigidity, stable accuracy, mainstream high-end choice.
Linear Guideway / Box Way:

  • Box Way: Heavy load, impact resistant, suitable for roughing and heavy cutting.
  • Linear Guideway: High speed, high precision, suitable for light-load high-speed and finishing machining.
Machining Center Frame

  • Vertical (VMC): Universal for molds and parts.
  • Horizontal (HMC): For box parts and multi-surface machining.
  • Linear Guideway / Box Way / Roller Linear Guideway: Roller Linear Guideway balances rigidity and speed with high cost performance.
④

Key Transmission Components (Directly Affect Service Life)

  • Guideways: Taiwanese or well-known domestic brands, quenching hardness and grinding accuracy.
  • Ball Screws: Diameter, lead, preloading method; larger diameter ensures higher stability.
  • Spindle Unit: Speed range, bearing brand (NSK/FAG, etc.), lubrication method.
  • Turret / Tool Changer Interface: Compatibility with customers’ commonly used systems and tools.
⑤

Casting Process and Stability

  • Whether artificial aging or natural aging is applied to eliminate internal stress.
  • Whether guideway surfaces are treated with high-frequency quenching and grinding.
  • Absence of visible sand holes, air pores, and casting defects.
  • Rationality of bed structure design (stiffener layout).
⑥

Compatibility and Expandability

  • Standard interfaces for electrical systems, CNC systems, and servo installations.
  • Support for hydraulic tailstocks, hydraulic chucks, driven turrets, chip conveyors, spindle cooling, etc.
  • Installation space and machine dimensions compatible with customers’ workshop conditions.
⑦

Brand and After-Sales Service (Particularly Important for Foreign Trade)

  • Manufacturer reputation, shipment volume, and stability of machine tool frames.
  • Availability of drawings and accuracy inspection reports.
  • After-sales response, repair cost, and universality of wearing parts.
Post time: Mar-25-2026