targets on workobject and quaternions space

k_schmid

hi,

I am failing to understand what the rotation targets on workobject mean?

Docs say  "The orientation is specified in relation to the current object coordinate system including
program displacement." Can i query that space somehow?

What does that mean for a rotating positioner?

Can i query the space somehow?

TASK PERS wobjdata Workobject_1:=[FALSE,FALSE,"PartMoverSim",[[0,0,0],[1,0,0,0]],[[0,0,0],[1,0,0,0]]];

I seem to not follow the second quaternion example in the docs either

https://forums.robotstudio.com/discussion/12072/manual-quaternion-example-gives-me-a-different-result-what-am-i-missing#latest

graemepaulin

For a rotating positioner the user frame of the workobject follows the rotation of the positioner (so any definition in the user frame fields are overwritten by the system).
As the object frame sits on top of the user frame it also rotates with the positioner but you can have linear and rotational displacements from the user frame defined here - they will not be over-written by the system.

k_schmid

Thanks so much . Can i query the parent frame somehow? Or visualize the axes?

k_schmid

Just to clarify the parent frame is the user frame then?

graemepaulin

Yes the parent frame is the user frame (it ultimately is related back to the base frame of the robot).
If by Query you mean obtain the value in RAPID then yes you can for both frames:
user frame

num_variable:=wobjTest.uframe.trans.x; (x,y,or z)
num_variable:=wobjTest.uframe.rot.q1;  (q1,q2,q3,or q4)

object frame

num_variable:=wobjTest.oframe.trans.x;

num_variable:=wobjTest.oframe.rot.q1;

k_schmid

So in my workobject neither oframe nor uframe is rotated still targets orient different from wobj0.

I am surprised. Is there any more magic?

2 axis Positoner holds the workobject

    num_variable_orx :=EulerZYX(\X, Workobject_1.oframe.rot);
    num_variable_ory :=EulerZYX(\y, Workobject_1.oframe.rot);
    num_variable_orz :=EulerZYX(\z, Workobject_1.oframe.rot);
   
    num_variable_urx :=EulerZYX(\X, Workobject_1.uframe.rot);
    num_variable_ury :=EulerZYX(\y, Workobject_1.uframe.rot);
    num_variable_urz :=EulerZYX(\z, Workobject_1.uframe.rot);

k_schmid

Can i query in world space somehow?

graemepaulin

You might be able to use the PoseMult function to do this?

k_schmid

I dont see a rotation in either frames maybe its the axis direction in the positioner?

graemepaulin

The axis direction and where the zero angle is of the positioner will be determined by the base frame calibration for the positioner.

k_schmid

then it makes more sense

k_schmid

So here is a target with a unit quaternion in world space, can i get these gui values (x -180) from code?

graemepaulin

num_variable:=test_1111_IO.trans.x; (x,y,or z)
num_variable:=test_1111_IO.rot.q1;  (q1,q2,q3,or q4)
If you want the Euler angles you will need to use the above Euler function