Frame function

  • Hello everybody,


    I would like to replicate the function "Frame" on other robots, like Kuka.


    SET pallet = FRAME(loc.origin, loc.x.axis, loc.pos.y, loc.origin)

    The new frame pallet has a different orientation than loc.origin, loc.x,axis and loc.pos.y (let's suppose these 3 points has the same orientation Rx,Ry,Rz)


    This difference can be calculated as: SET dif = INVERSE(pallet) :loc.origin


    Then, I can move on the pallet:

    SET pick = pallet:TRANS(0*x.distance, 2*y.distance):dif


    What I don't understand is why the frame pallet comes out with a different orientation, even though the 3 points have the same orientation between them.


    Do you have any idea?


    Thanks

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  • Hi,

    you can find very good and sipmle explanation of FRAME function by Kawasaki Youtube Channel:

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    The AS language is very similar to V+. Just consider instead of "SET" in V+ it is "POINT" in AS, instead of ":" in V+ it is "+" in AS and instead of "INVERSE" it is "-" (MINUS) in AS.

  • It has been many years since I was deep into V+ language, but something doesn't seem correct with your code. Perhaps. Maybe. Possibly.


    Your method of calculating and using the INVERSE transform dif bothers me for some reason, and I cannot discern why (too many years ago). :sleeping_face:


    Establish a frame (user coord sys) in space with


    SET pallet = FRAME(loc.origin, loc.x.axis, loc.y.axis, loc.origin)


    This assumes that you taught the three frame locations properly (and taught with an accurate tool):

    • loc.origin is at the ORIGIN of the new frame
    • loc.x.axis is ON the X-AXIS of the new frame
    • loc.y.axis is somewhere in the positive X-Y plane of the new frame (not required to be ON the Y-AXIS of the frame, but is nice if it is)
    • fourth argument defines the location of the new frame origin
    • orientation of the three frame location points is irrelevant, only X, Y, Z are used to calculate the frame

    Do all of that, then your command to calculate a point relative to the new frame pallet is:


    SET pick = pallet:TRANS(x_offset, y_offset, z_offset)


    BUT it is critical to recognize that the new point pick has the orientation of the new frame pallet. That is, if your frame pallet Z-AXIS is pointing UP (e.g., towards the ceiling) and you desire to have your gripper Tool Coord Sys Z-AXIS pointing DOWN to the workpiece (e.g, towards the floor), then you must reverse the orientation.


    SET pick = pallet:TRANS(x_offset, y_offset, z_offset):TRANS( <either RX = 180, or RY = 180> )


    If frame pallet is taught with foresight, then the pallet Z-AXIS is pointed the direction you need for the tool Z-AXIS, you just have to adapt the X, Y, Z offsets to match your physical position.

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