Method for manufacturing a stator or machining the inner wall of a stator

A method for manufacturing a stator or for machining the inner wall of a stator for an eccentric screw or eccentric screw motor by milling of the stator tube (6), wherein at least one milling head (4) is fed in the tube interior to form the tube inner contour or the threads (10),

• characterised in that
• at least two milling heads (4, 4′) are used for machining the inner wall of the stator tube (6), wherein, at the start of the machining, one of the milling heads (4) is brought (6) to a predetermined position near the stator with respect to the end (I) of the stator tube (6),
• the milling head (4) is accelerated to machining speed with respect to its rotary axis (C) and with respect to its linear axis (Z1) and fed into the tube interior and along its linear axis (Z1) from this predetermined position, wherein a thread (10) is machined until the milling head reaches at least the longitudinal centre of the stator tube (6) or exceeds a predetermined value,
• depending on the course of the individual threads (10) and on the position of the milling head (4) and/or the location of its contact with the stator tube (6), the exit point or the exit contour of the thread (10) to be formed by this milling head (4) or another thread (10) to be formed at the other end (II) opposite the stator tube (6), is determined or calculated, wherein the second milling head (4′) starts its machining of the inner wall surface of the stator tube (6′) at this point, wherein the milling head (4′) is moved along its linear axis (Z2) and rotated about its rotary axis (C′) until the milling head (4′) reaches the centre of the stator tube (6) or exceeds a predetermined value, and
• the threads formed by the respective milling head (4, 4′) to the centre are continued by the other milling head (4′, 4) in the respective other half of the stator tube (6) or are milled from the centre to the respective other end (I, II).