How to assemble/animate barrel cam

[ANilsson50]

See screenshot below for reference.

I have a situation where I need to move vertically and rotate at the same time and I cannot find the correct joint combinations to make this work.  As seen in screenshot, the 2 rods move up and down in the barrels.  As they move, there is s pin in each rod that follows a cam slot in the barrels.  Moving down, the 2 rods should rotate 180 degrees in opposite directions as they each follow their own cam slot.

There are rotational joints at the interface between each rod and the rod cap and they work correctly.  I cannot work out how to make the pins follow the multidirectional cams and there is no rotation of the rods as they move.

The slots in the barrels were made by embossing a sketch on the cylinders if that matters.

Help appreciated!

[MADCannon0077]

... and swipe with a twist surface method also working as shown in the attached video.

I am clueless as to what was wrong in the previous failed tries. Nevertheless I should say that, joint movement is still not as smooth as one would desire, specially when slot changes direction.

Big thanks to everyone for troubleshooting and contribution.

[jhackney1972]

Could you post the model you used in the last video, I would like to compare a few things with the other model. Thanks.

[MADCannon0077]

Sure thing!

Although I believe the slot angles are a bit different.

Let me know if you find anything.

[jeff_strater]

@MADCannon0077 - I think that the "jerkiness" is actually that these 4 faces are somehow not playing nicely with the tangent relationship:

I thought (and maybe still think) it might because the pin is exactly the same width as the slot, and it is getting pinched in these areas.  But, when I tried to make the pin smaller, then I couldn't get the tangent to work at all...  I will have the dev team take a look at this.  Thanks for sharing the model