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about the kinematics_msgs::GetPositionIK::Request and response

Hi everyone, I am using kinematics_msgs::GetPositionIK::Request and response to get the ik of my 6 dof arm.But I usually can not get a response. When i use position(.235,-.2996,-.3011) and quaternions(.674056,-.73868,0,0) , I can get the IK solution. If the position is (.235,-.3,-.3) and quaternions are the same are (.674056,-.73868,0,0) , I can not get the IK solution. The data nearly is the same. How to solve such problem? Thanks advance

about the kinematics_msgs::GetPositionIK::Request and response

Hi everyone, I am using kinematics_msgs::GetPositionIK::Request and response to get the ik of my 6 dof arm.But I usually can not get a response. When i use position(.235,-.2996,-.3011) and quaternions(.674056,-.73868,0,0) , I can get the IK solution. If the position is (.235,-.3,-.3) and quaternions are the same are (.674056,-.73868,0,0) , I can not get the IK solution. The data nearly is the same. How to solve such problem? Thanks advance

about the kinematics_msgs::GetPositionIK::Request and response

Hi everyone, I am planning the trajectory of 6dof robot arm to move arm from a initial position to a new position. First I have to get the ik solution and then plan in joint space. When using kinematics_msgs::GetPositionIK::Request and response to get the ik of my 6 dof arm.But I ik, usually can not get a response. IK solution. Such as: When i use position(.235,-.2996,-.3011) and quaternions(.674056,-.73868,0,0) , I can get the IK solution. If the position is (.235,-.3,-.3) and quaternions are the same are (.674056,-.73868,0,0) , I can not get the IK solution. The data nearly is the same. How to solve such problem? I am using ros fuerte on Ubuntu12.04 Thanks advance