Onto-line duct parts

An onto-line part attaches onto the outer or the inner surface of a straight duct piece, a duct shape, or a duct component. If the host part is moved or resized, the onto-line part is automatically moved or resized accordingly.

Typical onto-line components include duct valves and clamps.

When defining an onto-line component in Component Modeller, the following conventions apply:

  • Geometry type must be DM_GT_TEE. See DM_GT_TEE (7).

  • Nodes 1, 2 and 3 must be of type DM_CT_AUXPNT.

  • Node 4 must define a rectangular DM_CT_AIRDUCT connection.

  • Parameters "CsOhW" and "CsOhH" can be used to pass the cross-section half-dimension of the target part to the GDL object of the onto-line component.

When a designer is inserting the duct part in the model:

  • node 3 is expected to reside on the outer surface of the target part

  • the direction of node 4 is parallel to the perpendicular of the cross-section of the target part

  • the width direction of node 4 is parallel to the cross-section width or height (if rotated) of the target part

  • if the target part is a non-vertical duct, the direction from node 4 to node 3 defines the local "down" direction

You can use instance parameters to make the onto-line part match the target part both nominally (to enable search from specification) and physically (to fit the onto-line part to the outside dimensions of the target part’s cross-section where the onto-line part will have its connecting node 4).

The insertion command locates the cross-section of the target duct part, adds a branch anchor node and connects it to node 4 of the onto-line part, obtains nominal size from the target part node closest to the cross-section, and uses the nominal size to find a matching onto-line part from specification or from out-of-spec part. If the designer selected an onto-line part that uses instance parameters, then the dimensions of the target part are passed as instance parameters to the onto-line part.

When an onto-line part is connected to a duct part:

  • Selecting the duct part also selects the connected onto-line parts.

  • Changing the size of the duct part with Size tries to adjust the onto-line parts accordingly. If onto-line part is not using instance parameters, then a matching size might not be found.

  • Collision detection does not check onto-line parts against the duct part they are connected to.

Related Topics

Insert Part