RDS CAA rotations clearance

[[Jo...]]

I am programming a part where the RDS head rotates to B90, then goes down inside of a part and does many many A angle rotations.  What is a good strategy for being able to do these rotations without causing a full clearance retraction between each minor rotational adjustment?

What I would really like to say is "If you are only moving the A angle and not the B angle, please dont move all the way up to the -Z probe rotation clearance plane and stay where you are".  Any advice for how to approach this?  I am programming with Patterns, RDSCAA automatically assigned angles, and the travel path planner. 

Previous experience shows that the RDS head is happy to rotate right into the table, and I need to avoid that at all costs. 

 

[[Wo...]]

I think you can use the same sub-clearance plane and the part will rotate on the spot, but I don't know how to separate rotations with "A" only angle. I've done rotations inside the part, but that was with XTR so it was much easier to control. Especially with patterns which automatically assign angles - in my experience, RDS will just rotate 345 degrees instead of 15 all of a sudden.

[[Ch...]]

It may take some playing around but I do like Wojciech Malig's CALYPSO: Sub-Clearance Planes idea. I can't recall if the the RDS will rotate near a sub-clearance plane or if it may want to clear up to the parent clearance plane first but maybe if you pair that idea with some CMM Position points in which you set the RC-CAA angle to rotate right after the Circle Path scan? Scan the Circle Path with A0 B90 and then right afterwards set the CMM Position point to different A value (i.e. 15) maybe you can control the rotations a bit more. 

 

Or if your program allows for it you could try placing a CALYPSO: Rotate/Swivel Position inside the part however if other areas of the program require rotations this may not be very practical. 

[[To...]]

Here's program I did where I measured 24 pairs of inline holes using a pattern. The stylus was an "L" stylus with 24 qualified positions.  Note: the "Auto2: Shaft along normal" stylus used in features.  I used sub-clearance planes to keep probe down to measure both inline holes, but because I couldn't rotate the "A" angle below the clearance plane, I had to use position points control all positions, including to move above +Z for indexing.  I also had to run via "Characteristics list" so the patterned group would force it to measure both inline holes before indexing.

pattern with RDS 2.zip

[[Jo...]]

Very interesting!  I appreciate the response so much!  I think using position points will get me where I need to go (and be a relatively safe way to get there).  

I am working on a similar problem, and it is the L probe not seeming to work well with Auto: shaft along normal".  I need to play around with that more because it should do what I am looking for, and I am ending up with a bunch of PCM to assign rotations id rather get rid of. 

 

 

[[To...]]

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 I forgot to mention.  I don't believe it works with RDS-CAA.  Someone please tell me I am wrong.