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2016-01-07 06:21:40 -0500 asked a question Single actuator for two moving linkages in a gripper

Hi, I have a custom robotic gripper, that has two moving finger links actuated via single servo, similar to this one. So the first link joint is actuated directly from a servo and passes the torque to the second via 1:1 gear. My question is, what is the proper way to model such gripper in urdf/gazebo/ros_control? Is it possible to use a single interface like JointPositionController to move both finger links in simulation? I would appreciate any advice.

2016-01-04 13:00:34 -0500 commented answer xacro: parametrable constants?

One more question, do you recall what you meant by "The macros can be called dynamically with a single parameter." ? I don't see it in your repo, but calling a macro by dynamic names would be a solution. I see it in jade possible by xacro:call, unfortunatelly Im bound to previous releases

2016-01-04 12:30:46 -0500 commented answer xacro: parametrable constants?

Thanks for help. I see that u extracted inertias and joints to macros in separate file. This makes the code more readable, but it still requires copy-pasting of all the arm_id stuff and modifying the ids everywhere manually. Not exactly what I was looking for, but it seems that theres no better way.

2015-12-30 16:16:00 -0500 commented answer xacro: parametrable constants?

Hi, could you provide some example of your solution? I've tried using a macro that receives property id, and builds up property name while passing it as parameter to another macro. Unfortunately, it seems that the nested macro treats that param as a string and does not resolve it to a property.

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