Editing Joints

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DMU Kinematics Simulator lets you easily edit joints. Editing joints means you can modify:

  • its name

  • deactivate the command if any

  • modify its specifications (curve joints specifications: point curve, slide curve, roll curve joints)

  • either editing the existing geometry joint or replacing the existing geometry with a new one. Inboth cases, the mechanism is updated accordingly. Read Editing Curve Joints - Introduction

This task shows you how to edit joints

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Open the  rods+4joints.CATProduct  document. 

  1. Double-click the joint to be edited in the specification tree. For instance Revolute.1. The Joint Edition: Revolute 1 dialog box appears:

    The parts which are not involved in this joint are low-lighted.

  2. In the name field enter a meaningful name: Revolute. 1-3 for instance.

  3. Select the Angle driven check box to assign an angle driven command to the revolute joint.

    You can check the command positive orientation and invert it if necessary (either during joint or command edition). Note though, for Roll curve and Point curve joints you can only check the command orientation but not change it.

    The command orientation is defined by a green arrow (or or a blue arrow when it is possible to determine the  absolute movement of the sense of motion ) in the geometry area 

    • The parts which are not involved in the joint creation are displayed in low light (to easily locate the joint you are working on):

    • Pass the cursor over the green arrow or blue arrow to launch a short animation 

    • Click the arrow to reverse the command orientation if necessary

    The positive orientation of a command indicates the absolute movement of the parts involved (in the joint which is assigned the command) if it is possible (for open chain mechanisms) if not it indicates the relative sense of motion (intrinsic movement of the second part with respect to the first part involved in the joint).

  4. Set joints limits if needed. Refer to Setting Joint Limits and Checking Joint Limits for more detailed information.

  5. Click OK to confirm your operation.
    The revolute joint is updated and identified in the specification under its new name. The angle command assigned to Revolute.1-3 is also identified.

ainfo.gif (980 bytes) Note: you can easily edit the mechanism name. All you need to do is right-click the mechanism in the specification tree and select Properties from the contextual menu displayed.