T-FLEX Parametric CAD. Fundamentals. 2D Design

Let's review hidden line removal on the example of a shaft drawing
and a ball bearing fragment.
We need to create a hatch in the shaft drawing for hidden line
removal. Upon inserting the fragment in the assembly, the ball
bearing fragment image will be overlapping the shaft image. For the
shaft image to cover the lines of the ball bearing, we need to set the
priority of the ball bearing fragment lower than the priority of the
hatch contour on the shaft. This can be done by the immediately at the
time of inserting the fragment, or later, when editing it.
Upon modifying the fragment priority, refresh the image by
calling the command “RD: Update Model Windows” (by
pressing ). As a result, the image will appear as shown
on the lower right diagram.
Basic Fundamentals and Concepts of Working with Assemblies
Snapping the Fragment Elements
Even though the lines and other elements of a fragment are not part of the assembly drawing that includes it,
those can be used as references for creating various elements of the assembly drawing. Ordinary lines of the
fragment image (arcs and circles) can be used at the time when the object snapping is turned on. In this way,
one can create new construction lines on top of the fragment graphic lines or dimension those, or attach any
other detailing elements.
Besides the graphic lines, one can use the fragment nodes as references. To engage use of fragment nodes,
you need to activate certain settings. The flag “Create Nodes on Fragment Nodes” must be set in the
command “SO: Set System Options” on the tab “Snap”. This setting allows creating assembly drawing
elements that rely on the named fragment nodes or end points of graphic lines. In this way, the new nodes
based on fragment nodes are created in the transparent mode.
If the image of the fragment is crowded with various elements, working in transparent mode may become
somewhat difficult. In this case, you can turn off the discussed setting and work in the mode of forcing
creation of necessary nodes based on a fragment:
1. The command “N: Construct Node” allows creating only the nodes that will later be actually
used in the assembly constructions (a detailed description is provided in the respective chapter).
2. Named fragment nodes can be created automatically when inserting the fragment, provided that the
flag “Create Named Nodes Automatically” is set in the system settings (the command “SO: Set
System Options”, the tab “Fragments”).
Assembly BOM Creation
Creation of a bill of materials is one of the important steps in handling an assembly model. Detailed
description of handling BOMs is provided in the chapter “Bills of Materials”.
For automatic filling of BOM records, you need to make sure, that the parts (fragments) of the assembly
drawing contain sets of the relevant data. BOM data can be defined in the fragment part document at any
stage of creation. You can specify the way of using the nested elements (other fragments) and their data
contribution in the BOM upon assembling the fragment. This allows including in the BOM the data about
nested fragments or append data with a BOM belonging to a fragment document. Defining an appropriate
mode simplifies building bills of materials of multi-layer assemblies.
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