Ball screw selection calculator
The tool calculates lead from the required speed, then checks DN, critical speed and buckling load against the entered conditions.
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
Ph_min = v · 60 / n_motor
Example using default values
Ph_min = 300 · 60 / 3,000 = 6 mm → choose Ph = 6 mm
Source: THK / HIWIN / NSK ball screw technical calculation; Euler column theory; THK equation 5.
Frequently asked questions
Is the result a product code?
No. The result is a specification covering diameter, lead, accuracy grade and support arrangement for catalog verification.
How does the tool check DN?
The tool uses DN = D · N and compares it with the 70,000 limit applied to rolled ball screws in this calculation.
Must I verify the result with the maker's catalog?
Yes. Confirm root diameter, support factors, dynamic load and the actual mounting conditions in the catalog for the intended part.
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