The ball screw is one of the most expensive parts in a CNC machine — a new screw often costs tens to hundreds of thousands of crowns. Yet in the vast majority of cases the whole screw is not worn: the wear concentrates in the nut and the balls, while the screw itself stays in good condition. Refurbishment takes advantage of this — we replace the balls, preload the nut or adjust its geometry, dress out irregularities on the screw and return the screw to the machine fully functional.

The result: the machine regains its original positioning accuracy and backlash (often measurable in thousandths of a millimetre) for 20–40% of the price of a new screw.

1. Receipt and diagnostics

   We receive the screw and the nut together with information about the machine and a description of the problem. We measure the nut wear, the backlash and the screw geometry.

2. Quotation

   A detailed price quote with the scope of work — ball replacement, nut adjustment if needed, screw grinding if required.

3. Refurbishment (after approval)

   Disassembly of the nut, replacing the balls with a new size class (to remove backlash), and preloading the nut if needed. The screw is inspected and, if necessary, straightened and reground.

4. Accuracy measurement

   Checking screw straightness, nut backlash, dynamic tests.

5. Return shipment with report and warranty

   We send the screw and the nut back with a measurement report and a warranty on the refurbishment performed.

• Standard ball screws from all common manufacturers (THK, NSK, INA, HIWIN, Rexroth, KSS)
• Diameters typically 16 to 80 mm
• Standard leads (5, 10, 16, 20, 25, 32 mm and others)
• Single and double nuts (with preload)
• Screws with milled or turned ends

• The screw and the nut — the nut cannot be refurbished without the screw and vice versa, always as a set
• Machine type and axis + a description of the problem
• Drawing documentation of the screw and nut, if you have it
• For larger screws we recommend shipping in the original packaging or a wooden crate, so the precision threads are not damaged during transport