Max rotation limit warning with Swarf

[MadPickinSkills]

Hello,

I was wondering if anyone else is getting a Large B-Axis move in operation warning when posting a swarf toolpath that uses multiple tilt lines? The toolpath itself looks fine, I just get this message when I post it. If I unselect all but one tilt line then it will post without the warning. Its the swarf toolpath that's in the Surface/Solid group of multiaxis toolpaths.

[Allan]

The warning is coming from your post processor.

Most likely that one or more of your tilt lines are pointing straight up in Z.

This causes an issue where the 2 rotary axis become co-linear http://en.wikipedia.org/wiki/Gimbal_lock

The solution would be choosing tilt lines that are not vertical.

 

HTH

 

Allan

[SpacePilotPro]

I would try an astro-physics forum about that singularity issue.

[MadPickinSkills]

The warning is coming from your post processor.

Most likely that one or more of your tilt lines are pointing straight up in Z.

This causes an issue where the 2 rotary axis become co-linear http://en.wikipedia.org/wiki/Gimbal_lock

The solution would be choosing tilt lines that are not vertical.

 

HTH

 

Allan

Allan,

  Thanks for the reply. It's been my experience that the tilt line has to be selected in a way that makes it point toward the spindle, otherwise the tool vector will be in the opposite direction. At least thats the case with Mastercam.

[Jim at Gentex]

Yes, the vector lines should all point toward the spindle.

However, Allan's point is that it causes a problem if any of the vector lines are absolutely vertical.

The post needs any angular value other than zero to be able to make the correct calculation.

 

I have encountered this exact same situation and Allan's solution definitely works.

[Reko]

At least it was caught at the post.

 

I have had this issue before... the solution is to make your fixture so that it holds the part on an angle (say 10 degrees) to the rotary platter... that way, the tilt lines you choose are not pointing straight up through the Z-axis.

 

This way, those pesky singularities are avoided.

[MadPickinSkills]

Yes, the vector lines should all point toward the spindle.

However, Allan's point is that it causes a problem if any of the vector lines are absolutely vertical.

The post needs any angular value other than zero to be able to make the correct calculation.

 

I have encountered this exact same situation and Allan's solution definitely works.

Ok I see. Thats a good tip. Thanks for the reply's all.