Giving users substantial enhanced precision during hard whirling of ball screw spindles over the entire machining length with a maximum ± 7µm pitch diameter tolerance, is the WM 250 – 8000 whirling machine. A third prism-jaw self-centring steady rest with user-selectable position fixes and centres the free end of the bar stock, while the spindle axis is kept free so that the bars can be pushed through it. The 90-deg. chip conveyor removes the chips from the spindle axis and additionally facilitates through-loading of material in order to whirl spindles of any length using the repositioning process. Integrated measuring systems monitor the fitting in the already whirled thread during repositioning. In addition, the whirling attachments can be equipped with a controlled A axis (inclination adjustment), so that the angle of inclination of the whirling attachment follows the changing pitch angle during the machining process.
