Download Working Model 3D

3.4 Adjusting the Joints
3-21
Currently, the connecting rod and the crank assembly move together like
a single rigid body. In this step, you will adjust the joints to give each the
appropriate degrees of freedom.
Adjust the Joints on the Connecting Rod
The connecting rod has been given too many constraints by Working
Model 3D. In this step, you will remove two rigid joints that are currently
preventing the true motion between the connecting rod and other
assembly parts from occurring.
A1. Select “CON_ROD_1/COMP1_1” in the Object List.
The Connections List displays the constraints and Coords attached
to the connecting rod.
A2. Select “constraint[69]”, the first rigid joint, in the Connections
List.
The Connections list displays the bodies and Coords attached to the
rigid joint.
A3. Hold down the Control key and click on “coord[29]” and
“coord[31]”, the two Coords attached to the rigid joint, in the
Connections list.
The rigid joint, “constraint[69]”, as well as the two Coords,
“coord[29]” and “coord[31]” should be selected when you are
done.
A4. Press the Delete key.
The rigid joint and the two Coords are removed from the model.
A5. Repeat steps A1 thru A4 to remove “constraint[73]”, the other
rigid joint, and “coord[37]” and “coord[39]” from the connecting
rod.
Adjust the Joints on the Crank Pin
The crank pin has been given the right number of constraints by Working
Model 3D, but the joints have been given too much freedom. In this step,
you will change two revolute joint on slots (which can slide along an