Define what the machine axis needs
When buying ball screws in Chennai, a diameter and length are useful starting dimensions, but the requirement also needs an accuracy specification. Keep the machine drawing and original assembly reference with the enquiry. For a CNC machine, identify the axis and machine model. For a new positioning system, provide the design requirement rather than selecting a screw solely from its external dimensions.
Lead accuracy and backlash answer different questions
Lead accuracy concerns the relationship between screw rotation and linear travel. Axial clearance concerns movement between the screw and nut. THK’s selection guidance considers accuracy and axial clearance separately. A low-clearance assembly does not, by itself, establish the positioning accuracy of the complete machine. Record the specified accuracy grade and clearance or preload requirement as separate enquiry details.
What does a preloaded ball screw do?
THK describes preload as a way to reduce axial clearance and increase rigidity. It also accounts for preload in service-life calculations. More preload is not automatically the correct choice for every axis. Use the assembly specification and the manufacturer’s selection method when comparing options for the machine duty.
Include the ball screw support bearings
The screw, nut and support arrangement work together. THK’s rigidity guidance includes the support bearings as part of the system. If the maintenance requirement includes ball screw support bearings or complete end supports, list those as separate items with their markings and quantities. Avoid treating a bearing, a housing and a complete support unit as the same purchase item.
Rolled or ground: compare the complete specification
Keep the specified rolled or ground construction, accuracy grade and preload in the enquiry. Also attach the nut mounting drawing and the details of both shaft ends. Our replacement ball screw ordering checklist covers diameter, lead and end machining in more detail. When comparing quotations, check that each quote includes the same scope: the complete screw-and-nut assembly, a nut alone, or additional supports.
Request a ball screw quotation from South India Bearing Co.
For THK or HIWIN ball screw requirements in Chennai, send the preferred make, original reference, shaft drawing and quantity to South India Bearing Co. Include the delivery location and required date. If a drawing or specification is missing, identify the gap and attach clear photographs of the assembly and labels. Contact contact@southindiabearing.com or 044 2522 2165 for an enquiry.
Related products and catalogues
Browse the relevant South India Bearing Co. product pages for range details, manufacturer catalogues and quotation enquiries.