In a tire‑building machine, the rotating drum that forms the carcass is mounted on a spindle that uses an angular contact ball bearing with a double ball crown. The bearing absorbs the heavy radial forces generated by layers of rubber and fabric while simultaneously coping with the axial thrust created by the drum’s compression pressure. By maintaining precise alignment of the drum’s axis, it enables smooth, high‑speed rotation and minimizes vibration, which is essential for achieving consistent tire dimensions and surface quality. The same bearing type is often found in the turntable of a curing press, where it supports the platform that rotates the green tire during vulcanisation, guaranteeing uniform heat exposure and preventing warpage. A secondary application appears in high‑speed rubber extrusion lines, where the bearing’s ability to handle combined loads keeps the extruder rollers running reliably. This bearing keeps the drum’s rotation precise, allowing the plant to meet tight dimensional tolerances for every tire produced.