What is a THK ball screw?
The Ball Screw is a high-efficiency feed screw with the ball making a rolling motion between the screw axis and the nut. Compared with a conventional sliding screw, this product has drive torque of one-third or less, making it most suitable for saving drive motor power.
How much weight can a ball screw lift?
A ball screw drive translates rotational motion to linear motion or vice versa and can apply or withstand high thrust loads – upward of 750,000 lbs static capacity using a Ø6.
What material are ball screws made of?
Materials. Ball screws are either made from plastic, metal or both. The shaft of the ball screw is always machined from steel or stainless steel, but the ball nuts may be made from plastic or metal, depending on the application.
What is ball screw stroke?
Stroke: The linear distance in either direction that a ball screw or ball nut travels in moving the load. Temperature: Ball screw assemblies operate with normal efficiency between temperatures of -65 degrees F to 300 degrees F with suitable lubrication.
What is the difference between a lead screw and a ball screw?
The key difference between a ball screw and a lead screw is in the way the load is carried between the moving surfaces. A ball screw uses recirculating ball bearings to minimize friction and maximize efficiency while a lead screw depends on low coefficients of friction between sliding surfaces.
How do you calculate ball screw force?
So you can calculate the rotational vector component of force based on torque and the radius of the ballscrew. T = F1 x D/2, where: F1 is the vector component (tangent to the ballscrew) of the force applied by the screw onto the ball bearing. Linear force is produced because of the angle of the ballscrew thread.
What is the lead on a ball screw?
Lead is the linear travel the nut makes per one screw revolution and is how ball screws are typically specified. For multiple start screws the lead is the pitch multiplied by the number of starts. …
How fast can a ball screw move?
Maximum Speed In general, ball screws with small balls have somewhat lower speed limits than screws with larger balls. For Steinmeyer ball screws, speeds can range from 4,500 rpm for 3-mm balls) to about 1,050 rpm for 125-mm balls.
What are the four common types of ball screw mounting arrangements?
By ball circulation method, the Ball Screws are divided into return-pipe type, deflector type and end-cap type. And by preloading method, fixed-point preloading (double-nut method, offset preloading) and constant-pressure preloading are selectable.
