1. This problem may be caused by the `PositionJointInterface` ([See this Gazebo Answer](http://answers.gazebosim.org/question/19287/friction-insufficient-in-grasping-simulation/?answer=20501#post-id-20501)).
What happens if you use an `EffortJointInterface` for the grippers?
2. Try giving your gripper contact links a small `<minDepth>` value of say 0.002-0.003 and a `<maxVel>` value of 0. This main provide more consistent contact between the gripper links and the object being grasped.
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<gazebo refrence="GRIPPER_LINK_NAME">
<minDepth>0.003</minDepth>
<maxVel>0</maxVel>
</gazebo>
However when I click Post Your Answer, I get the following message:
It’s interesting that both Gazebo Answers and Gazebo Community flagged your post as spam, I wonder what could be in it that’s triggering the automated spam detectors.
Unfortunately, I don’t have a good suggestion for you at the moment; I checked your Gazebo Answers account and everything seems to be in place. Maybe you can try posting part of your answer and then editing to add the rest to see how far it goes through? I’d be curious to know what part of the message is triggering spam.
Your link actually just reminded me that we have seen this issue before. On December 14th 2018, at around 10 am PST we noticed that all comments from a few of us, including me, were always being detected as spam. I ticketed an issue with Akismet, and before they could reply it looked like the issue solved itself, at around 2pm of the same day.
I’ll follow up with Akismet. Sorry it took me all this back-and-forth to remember that.
I am the one who posted that issue in gazebo answers, Ill try your suggestions during the following days. Ill continue the issue in Gazebo Answers, hopefully you don’t get more issues with the site.