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Selection

Ball Screw for CNC Machine: Selection Guide

Help CNC machine buyers match ball screw lead, accuracy, and end interfaces to their machine condition.

Published: · Selection

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Match the machine condition before choosing a model

Selecting a ball screw for a CNC machine starts with the actual working condition, not the brand. Confirm three factors first: machining load, feed speed, and positioning accuracy. These decide screw diameter, lead, and accuracy class.

  • Machining center axes: heavy load, commonly 25-40 mm diameter with 20-40 mm lead driven by servo motors.
  • Woodworking CNC and engraving machines: light load and higher speed, commonly 16-20 mm diameter with 10-20 mm lead.
  • Precision positioning: C3 or C5 accuracy class, often working with a linear scale or encoder in a closed loop.

Lead decides speed and thrust

A larger lead means more travel per motor revolution and higher speed, but lower thrust at the same motor torque. The difference between 10 mm and 20 mm lead directly affects feed rate and machined surface quality.

What to include in the RFQ

When asking a supplier for a quotation, include the following in one RFQ:

  • Screw diameter, lead, overall length, and working travel.
  • Accuracy class such as C5 or C7, and expected positioning accuracy.
  • Fixed-side and support-side arrangement, or matched end machining.
  • Motor interface: coupling-end diameter, keyway, or lock thread.
  • Working environment: dust, cutting fluid, or high temperature.

Higher accuracy class is not always better

C5 costs more and takes longer to produce than C7. For ordinary woodworking CNC, C7 is enough; machining centers and precision engraving benefit from C5. State the real accuracy requirement in the RFQ so you do not pay for accuracy you will not use.

FAQ

Does a CNC ball screw always need a servo motor?

Not necessarily. A stepper motor can drive it, but a servo motor with encoder feedback gives better positioning and high-speed performance, which is why machining centers generally use servo drives.

Does a larger lead reduce machining accuracy?

Lead affects resolution and thrust. With a larger lead, each single step moves further, so precision work should use a suitable lead with a high-resolution drive.

Next step

Turn this guide into an RFQ

When the specification direction is clear, send the details below together with quantity, lead time, and packing requirements.

Include these details

  • Model, diameter, lead, accuracy grade, or target application.
  • Load, speed, travel, mounting method, and matching rail or support-unit needs.
  • Quantity, lead time, packing, and whether inspection records or shipment photos are needed.
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