Ball Screws: Precision Ground

Dynatect manufactures ground ball screws for both new designs (OEM) as well as replacement ball screw applications.

  • Made to your specification: You are not “locked in” to a few ball screw and nut designs in a catalog. This will minimize the need for you to retrofit or adjust other components.
  • Easy to work with: Ball screw assemblies can be manufactured based on drawings, a sample unit, or the specifications you provide us via our quote form.
  • Need CAD files? Our fully automated CAD system allows us to design in real time, so we can deliver a model early in your design.
  • Size Flexibility: Ball screw diameter and lead sizes are offered in both imperial and metric sizes. We manufacture ball screw diameters from 5/8″ to 6″ and specialize in long screws. (longest to date was over 54 ft.)

About Precision Ball Screws

Why use a precision ball screw?

Precision ground ball screws are favored for a high degree of travel accuracy, which is expressed by lead error. Lead error refers to the measured lead minus the specified lead (deviation)

High precision is usually required for applications where the dimensional tolerances of the part being produced are critical or need to be highly repeatable.  Examples of these types of applications are typically found in machining operations, including but not limited to, metal cutting and grinding.

Precision ground ball screws may not be required for simple “transport” tasks where high accuracy repeatability is not critical and additional systems are in place for controlling motion.  Examples of these types of applications are typically found in material handling and automated transport lines.

Dynatect LSI can manufacturing high-precision ball screws up to ANSI Class 2 or DIN/JIS Class 1 specification.

LSI Capabilities

  • Large Diameters (up to 6 inches) – Screw diameters from 5/8” to 6” (16mm to 150mm). Larger diameters may be available upon request.
  • Long Screw Lengths – Available in virtually any length. (Our longest ball screw is 54 feet in length.)
  • “Zero Lost Motion” Solutions – We customize your design to minimize backlash and eliminate deadband.
  • Full Customization – Your ball screw will be configured with the options you specify, and can be further customized for a complete solution that is quick and easy to install, saving you time and money. Options:
    • Ball nut style/configuration (single or double nut, 2-piece flange to flange nut, middle flange nut)
    • Internal or external ball returns
    • Wipers and end seals
    • Custom journal ends
    • Custom housing and mounting blocks

What is a ball screw? 

Check out this video via Design World, sponsored by Dynatect.

 

Excerpt from the video:

A ball screw is a mechanical device that translates rotational motion to linear motion. The basic components of a ball screw are a nut and a screw with helical grooves, and balls. The balls roll between the nut, the screw and the grooves when either the screw or nut rotates. Balls are routed into a ball return system of the nut and travel in a continuous path from their starting point to the end, and then back to their starting point. Wipers are often used on either side of the nut to prevent debris from compromising the life of the ball screw assembly.

 

Ball Return/Nut Designs

Internal Ball Return* – Our internal ball return designs (end cap or internal button) provide the following benefits:

  • Optimal life – balls travel in paths that are tangent to the pitch, resulting in longer life and reduced wear
  • Higher operating speeds – travel path increases permissible speed
  • Smooth operation and low noise – balls spend less time traveling unloaded
  • Cost-effective design – a single component which allows for smallest overall package sizes
  • Ease of installation – components protected by design means low risk of damage during installation
  • *Note: External tube ball return designs can be provided to accommodate shorter length nut designs and multistart screws can be provided for long lead – high capacity applications.

Two common ball return methods are the internal return and the end cap return. The internal return method with a single turn and multiple circuits is good for typical lead and diameter combinations. It’s also the smallest overall package space versus the end cap and external tube return, and also is the best design for balancing life and speed.

End cap returns are best for long lead applications where lead is greater than 50% of the screw diameter. It’s also a smaller overall package space versus the external tube design, for instance.

End Cap Return – Single circuit with multiple turns.

custom ball screw end cap return

  • Best for long lead applications where lead is greater than 50% of the screw diameter
  • Smaller overall package space versus external tube design
  • Best design for balancing life and load

Internal Button Return – Single turn with multiple circuits.

custom ball screw internal button return

  • Good for typical lead and diameter combinations
  • Smallest overall package space versus end cap and external tube returns
  • Best design for balancing life and speed