UPDATED

6. With the two parts in the drawing, you can attach them to each other. This is done by employing 3D constraints.
Working in 3D takes pre-planning, and so let’s think through what is needed:
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You want the pin to stay inside the piston head
The pin must be free to rotate, but it cannot slide in and out of the piston
To accomplish this goal, you need to apply two 3D constraints:
Concentric constraint keeps the pin centered inside the hole of the piston (but allows the pin to slide
out of the piston)
Tangent constraint keeps the pin from leaving the piston
a. Open the 3D Constraints toolbar by right-clicking any toolbar and then choosing BRICSCAD | 3D Constraints.
3D Constraints toolbar for attaching components
b. Click Concentric:
: dmconcentric3d
c. And then pick a curved face (a.k.a. subentities) from the piston and the pin:
Select a pair of subentities: (Pick the curved face of the pin, highlighted in blue on the
yellow part shown in the figure below)
Entities/subentities in set: 1
Select a pair of subentities: (Pick the curved inside face of the piston, also highlighted
in but on the pink part)
Selecting curved surface to make components concentric
TIP Should you have difficulty picking the correct face with the cursor, press the Tab key to cycle through all
possible surfaces under the cursor.
The command ends automatically after you pick the second subentity. Notice that the pin jumps over to
the opening of the piston. The pin is inside the piston; now you use the Tangent constraint to keep the
pin from sliding out of the piston.
Concentric constraint lines pin up with piston’s opening
6 Working in 3D 209