Universal Robots UR3/CB3 User Manual page 183

14.24 Command: Force
a workpiece. Force mode also supports applying certain torques around predefined
axes. Note that if no obstacles are met in an axis where a non-zero force is set, the robot
arm will try to accelerate along/about that axis.
Although an axis has been selected to be compliant, the robot program will still try to
move the robot along/around that axis. However, the force control assures that the
robot arm will still approach the specified force.
Feature selection
The Feature menu is used to select the coordinate system (axes) the robot will use
while it is operating in force mode. The features in the menu are those which have
been defined in the installation, see 13.12.
Force mode type
The are four different types of force mode each determining the way in which the
selected feature will be interpreted.
Version 3.3.3
• Simple: Only one axis will be compliant in force mode. The force along this axis
is adjustable. The desired force will always be applied along the z-axis of the
selected feature. However, for Line features, it is along their y-axis.
• Frame: The Frame type allows for more advanced usage. Here, compliance and
forces in all six degrees of freedom can be independently selected.
• Point: When Point is selected, the task frame has the y-axis pointing from the
robot TCP towards the origin of the selected feature. The distance between the
II-99 CB3