To assign a linear spring in one or more degrees of freedom to a support, use the following procedure.

1. Select the nodes that will have the same support condition.
2. On the Specifications ribbon tab, select the Custom tool in the Supports group.
   
   The Create Supports dialog opens to the Fixed But tab.
3. In the Define Springs group, type the linear spring constant to use for each translational and rotational spring direction.
   • KFX - translation in the global x direction
   • KFY - translation in the global y direction
   • KFZ - translation in the global z direction
   • KMX - rotation about the global x axis
   • KMY - rotation about the global y axis
   • KMZ - rotation about the global z axis
   Note: If a spring constant is specified in a direction, then the corresponding degree of freedom cannot be released. A given support type can have a mix of releases and springs, but only in different degrees of freedom.
   For example, a fixed but support could have MX, MY, and MZ released as in a pinned support and also have spring constants defined in FX, FY, and FZ.
4. Either:

   To…	Do the following…
   add the support type to the model and assign to the current node selection	click Assign.
   add the support to the model for later assignment	click Add.

   The dialog closes.