To　investigate　the　Rotation　effects　of　the　force　transducer　on　the　output　of　the　build-up　system,　a　common　model　about　the　output　of　the　column　type　force　transducer　affected　by　the　parasitic　components,　including　the　side　force　and　additional　moment,　was　proposed.　Based　on　the　model,　the　indication　error　and　position　error　of　the　build-up　system,　which　was　calibrated　following　different　procedures　with　and　without　rotating　the　position　of　the　force　transducer,　were　discussed.　The　verification　experiments　were　carried　out　using　three　300　kN　build-up　systems　of　common　build-up　structure　with　various　thicknesses　of　the　upper　platen　as　well　as　a　300　kN　and　a　60　MN　build-up　system　of　a　special　build-up　structure.　The　results　showed　that　the　force　transducer　loaded　in　a　build-up　system　had　strong　rotation　effects　especially　when　the　stiffness　of　the　build-up　structure　was　low.　The　rotation　effects　would　cause　large　uncertainty　to　the　output　of　the　build-up　system.　The　build-up　system　should　be　calibrated　with　testing　the　force　transducers　in　three　uniformly　distributed　positions　over　360　degrees　to　eliminate　the　effect　and　reduce　the　indication　error　of　the　build-up　system.　The　rotation　effects　of　the　force　transducer　had　little　effect　on　the　position　error　of　the　build-up　system,　which　verified　that　the　position　error　of　the　build-up　system　was　often　much　smaller　than　that　of　single　force　transducer.　Besides,　the　stiffness　of　the　build-up　structure　should　be　enhanced　in　the　design　of　the　build-up　system.　The　special　build-up　structure　was　a　proper　design　to　eliminate　the　rotation　effects.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.