Dynamic Profile in Calypso???

[[Pa...]]

Has anyone had to report against a dynamic profile yet (ASME y14.5 2018)?

In the case of my drawing, the "dynamic" is invoked only for form evaluation; no datums.

I'm inclined to use line profiles in this case.  Curious how y'all are handling these.

 

[[Ma...]]

I am curious - but i think it's just profile without datum and without dimension - so i would use FORM instead of surface profile. Never saw that on ISO and yet it's from ASME 2018?

Very curious.

[[Er...]]

In ISO its called Offset Zone, or unspecified linear tolerance zone offset (something like that). OZ -Modifier. I have not read what ASME says, since none of our Aeroderivative parts use this, but you can't use form in ISO, since the shape is still constrained by the tolerance band. (ASME is usually a better standard, so I asume it's the same, since ISO is logical here.) Instead use the offset function in 2d/3d-curve. If I recall correct, ISO calls for a average offset, gauss.

[[Ri...]]

There are three ways to achieve this for your current situation:

1. You could use Form on the Torus, and just make sure you are using the Minimum Zone evaluation method. 
2. You could measure this as a Torus. Then create a copy of that same Torus, use Recall Feature Points from the original Torus, and then use a formula to pull the actual size of the  original Torus into the nominal of the Recall Feature Points Torus. This should get you what you are looking for. 
3. If you want to use individual Curves to measure the Profile, then just report the individual Profiles. Since it is an open curve, for the most part, the Line Profile with no Datum should net you the result you are looking for as well. 

Edited November 14, 2025

[[Pa...]]

Agreed on all points.

ASME calls this "dynamic" profile.  It's usually a little better defined than this (new engineers like to just put profile on everything rather than take the time to dimension their drawings.

This dynamic profile with no DRF controls the form of the surface, but allows the zone to "float" based on the missing definition.  Here, we have engaged the customer and are asked to interpret this form control zone to "float" along with the adjacent diameter.

This area is super difficult to reach.  I can't share more of the pic but suffice it to say I'm coming in through a hole that barely fits a stylus which will reach the larger bores within.  Once I can reach the bore, I can only touch 30degrees of the surfaces.  So I use 3 seperate systems oriented 120° from one another, go in three times for each feature, and touch my 30°.

As such, I'll be using line profiles; form only.

[[Pa...]]

And actually there is a section for "dynamic profile applied to surfaces of revolution", which applies here.  I'm now thinking the discussion with the customer was unnecessary because it is fully defined.