Test bidirectional repeatability by repeatedly approaching the same target positions from both directions under controlled load, speed and temperature conditions. Report the spread within each approach direction and the difference between directions separately. A motor encoder count or command incr

Effective stroke is the travel available for the intended task. Overall length is the physical envelope of the selected module and its specified accessories. A 400 mm required move therefore does not imply a 400 mm-long module. Carriage length, end structures, drive hardware and operating clearance

To measure ball screw backlash at the nut, prevent the screw from rotating or moving axially, reverse a defined axial load on the nut, and measure the nut’s movement relative to the shaft. A reading taken only at the machine table can also include support-bearing movement, coupling effects, housing

Replacing only a ball nut can be appropriate when the manufacturer confirms compatibility with the retained shaft and the shaft remains serviceable. Nominal diameter and lead are necessary identification details, but they do not establish raceway, ball-size, preload or return-system compatibility.

In common ball-screw naming, 1605 identifies a nominal 16 mm screw with 5 mm travel per revolution, while 1610 identifies a 16 mm screw with 10 mm travel per revolution. Confirm the supplier’s full code. At the same screw rpm, a 10 mm lead moves twice as fast; at the same axial force, it needs appr

The DN limit and shaft critical speed address different restrictions. DN relates screw speed to the nut’s rolling-element circulation system using a manufacturer-defined diameter. Critical speed concerns the rotating shaft’s tendency to resonate. The permissible operating speed must satisfy both, a

Fixed-fixed ball screws restrain the shaft axially at both ends. Fixed-supported arrangements establish axial location at one end while the other support primarily provides radial guidance and accommodates the intended axial movement. Fixed-fixed support can improve shaft restraint, but it requires

A ball screw end-machining drawing should define the bearing seats, locating shoulders, locknut thread, drive extension and their relationships to the screw axis. Overall length alone is not enough. The drawing must show how the screw fits the support bearings and coupling without trapping an unint

Linear guide blocks can be interchanged only when the manufacturer permits the particular rail, block, accuracy and preload combination. Matching rail width or bolt spacing does not prove raceway compatibility. When the system is supplied as a matched assembly, treat its rail and blocks as a set un