how to know robot configuration from robot axes

Hi all,

I need to know how to get de robot configuration (RST) when i have all the robot axis (j1=-160/j2=52/j3=0/j4=-36/j5=-118.5/j6=-56 for example).

is it possible to make a macro in excel?

thank you so much

Quote from panic mode

sure... you need to have DH parameters for the robot (from robot geometry) and then use series of calculations (one for each joint) using homogeneous transform. Kuka uses Rz(A)*Ry(B)*Rx(C) as transform convention.

Do you know where can i find the formula needed to do it? (convert robot joints (j1,j2,j3,j4,j5,j6) to robot configuration)

I know the robot tcp (x,y,z,rx,ry,rz), locations (x,y,z,rx,ry,rz) and work frame. they are all welding robots

EDIT: i already have robot joints

Quote from Fubini

Or you could call the built-in FORWARD function on your robot controller.

Fubini

Thanks, but we have to configurate 79 robots with several trayectories each, we need to do it offline, do u know another way to do it offline with the data i have written before?.

Thanks

Quote from SkyeFire

If you have the axis angles for the robot joints, S&T should be nearly trivial to determine. If all you have is Cartesian coordinates, you will pretty much have to do the full DH kinematic model -- I ended up running into this exact problem about a year ago.

S&T are both Integer variables, representing a binary pattern where each bit reflects the position of a given axis. The Least Significant Bit (Bit 0) is always A1, and Bit 5 is always A6.

The T values simply indicate if an axis is above or below 0. The T bit is False if the associated axis is >=0, and True if the associated axis is <0. So for example, if $AXIS_ACT={91,-45,37,1,-1,0}, the T value would be 'b010010', which works out to an integer Base-10 value of 18.

S disambiguates axis positions when a given Cartesian position can be reached with multiple different axis configurations. S only has 3 bits. Bit 0 indicates if the robot is working in the Basic Area (False) or Overhead Area (True). Bit 1 indicates if A3 is higher or lower than Phi, but Phi is dependent on particular robot models. Bit 2 indicates A5, and is False if ((($AXIS_ACT.A5 >=0) AND ($AXIS_ACT.A5 < 180)) OR ($AXIS_ACT.A5 < -180)), and True if (($AXIS_ACT.A5 >=-180) AND ($AXIS_ACT.A5 < 0)) OR ($AXIS_ACT.A5 >= 180)).

The granular details are explained in the KUKA manual -- search for "status and turn".

One thing I notice that doesn't appear to be documented is where one might find the value of Phi in the MADA for a particular robot.

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Thanks, i´m going to try this.

Regards