Servomech S.p.A.
01.05.TR.E - Rev. 02 DD (M/Y) 12/19
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DO NOT SET THE LENGTH OF THE SCREW JACK OVER ITS EXTREME VALUES:
“Lc” = retracted screw jack length
“La” = extended screw jack length
Figure 6.17 – “Lc” and “La” dimensions for Mod.B screw jacks
Dimensions “Lc” and “La” are indicated on the check sheet supplied with the screw jack.
Fit the screw jack to the plant in order to have ONLY AXIAL LOAD applied to the acme screw.
Provide RADIAL support to the CYLINDRICAL ROTATING END (N) of the acme screw with a bearing.
The cylindrical end (N) must be free to move in axial direction: DO NOT FIX IT.
Check the axis of the acme screw and the screw jack fixing surface are perpendicular.
Check the supporting surfaces of the screw jack and the load are parallel.
In case of screw jack with TRUNNION MOUNT (SC): the pins on the housing and the pins on the acme
nut must be PARALLEL.
Figure 6.18 – Mounting of Mod.B screw jacks
RIGHT WORKING OF THE SCREW JACK AND PLANT CANNOT BE GUARANTED IF SIDE OR NOT AXIAL
LOAD ARE APPLIED TO THE ACME SCREW.
