1504105 Eccentric shaft for spindle drum indexing on Gildemeister DMG Mori AS20, GS20, GM20, GM20AC multi-spindle lathe is a precision technical component of the spindle drum rotation and indexing system on Gildemeister DMG Mori AS20, GS20, GM20, GM20AC multi-spindle lathes. The eccentric shaft is installed in the fork 1504102 which, rotating with the camshaft 3104114, engages the Geneva cross 1504101 and transmits rotation to the spindle drum, to engage correctly with the Geneva cross, the shaft also rotates on its own axis because it carries the wheel 1504104 acting as a planetary wheel on wheel 1504103. Within the drive kinematics, this item should not be considered a generic mechanical spare part, but a functional element of the synchronism between camshaft 3104114, fork 1504102, eccentric shaft 1504105, wheel for eccentric shaft 1504104, wheel 1504103, Geneva cross 1504101, roller 1504106 and bushing 1504114. wear, scoring, incorrect eccentricity, clearance in the bushing 1504114, bearing or roller 1504106 can create indexing malfunctions and compromise machine precision and reliability. The timing and synchronism of drum rotation, positioning and stop movements depend on the correct condition of this kinematic assembly. Periodic inspection should verify clearance, impact marks, sliding, rolling, centering, lubrication and the consistency of the coupling between fork 1504102, eccentric shaft 1504105, wheel 1504104, wheel 1504103, Geneva cross 1504101, roller 1504106 and bushing 1504114. During extraordinary maintenance it is advisable to assess coordinated replacement of the wear components, including bearing, eccentric shaft, bushing and roller, because partial repair can leave residual clearance and compromise final accuracy. The operation requires technical personnel with advanced knowledge of the multi-spindle lathe and indexing kinematics, as incorrect assembly can generate impacts, phase loss, non-repeatable positioning, overload of connected mechanisms and reduced machine reliability. Tadaah offers this spare part for maintenance technicians, quality control departments, machine tool builders and users working in turned metal small parts, automotive and precision engineering. Correct identification of the code and kinematic function helps optimize spare part selection, reduce purchasing mistakes and support targeted repairs on Gildemeister DMG Mori AS20, GS20, GM20 and GM20AC machines.