RE: Rotation & angle of universal joint?
2021-08-22, 17:09 (This post was last modified: 2021-08-23, 19:50 by N. W. Perry.)
2021-08-22, 17:09 (This post was last modified: 2021-08-23, 19:50 by N. W. Perry.)
EDIT: Never mind. 
While reading through the script to figure out the necessary math, I noticed this line:
Commenting out that optional line made it unnecessary to rotate the end piece in the first place, so my question, while still of interest, now becomes purely academic.
(But why is the vector argument here 0, 0, 90 instead of 0, 0, 1 for the z-axis?)
Follow-up question: Let's say I've applied the script (the improved one that now comes with LDCad, naturally) as above, and now I want to rotate one of the U-joints 90 degrees longitudinally—for example, so that the slots align on the center link?
It's easy enough to rotate the ends, just by changing signs and moving 1's around in the matrix. But how about for the center piece? That seems like it should be just as easy, but I can't work out the right process.
Theoretically, you could rotate the ends and then re-apply the script to just that one joint, but this seems to introduce slight misalignments that weren't present when applying the script to both joints at once. I'd like to retain the calculations done by the script the first time and just manually type in the 90 degree rotation.
While reading through the script to figure out the necessary math, I noticed this line:Code:
endCPosOri:mulRotateBA(90, 0, 0, 90) --optionalCommenting out that optional line made it unnecessary to rotate the end piece in the first place, so my question, while still of interest, now becomes purely academic.
(But why is the vector argument here 0, 0, 90 instead of 0, 0, 1 for the z-axis?)
Follow-up question: Let's say I've applied the script (the improved one that now comes with LDCad, naturally) as above, and now I want to rotate one of the U-joints 90 degrees longitudinally—for example, so that the slots align on the center link?
It's easy enough to rotate the ends, just by changing signs and moving 1's around in the matrix. But how about for the center piece? That seems like it should be just as easy, but I can't work out the right process.
Theoretically, you could rotate the ends and then re-apply the script to just that one joint, but this seems to introduce slight misalignments that weren't present when applying the script to both joints at once. I'd like to retain the calculations done by the script the first time and just manually type in the 90 degree rotation.