Iterative alignment

[dagrpa123]

Hi everyone,
Is there an advantage using an iterative as opposed to say a 3-2-1 alignment when using customer models?
Thanks in advance.

[mrollings53]

Probably depends most on the actual model. If the datums are nice easy to define shapes, ie. planes, cylinders, lines etc. 3-2-1 should be fine. If datum A is a 12 foot diameter cylinder, and the part is about .5 degrees of that circumference and shaped like a helix, then an iterative alignment is better.

Also, can be useful when using a Readpoint alignment. Iterate the rough alignment, then measure datums for a datum alignment.

[Schlag]

Any time you have specific DATUM TARGETS its a must.

[brian.freeman]

Iterative is alos better when you have complex surfaces as datums. or target points defined by engineering.
Otherwise, I use a readpoint alignment.

[dwade]

Depends on what your drawing specifies. For a part drawing with datum target points it is pretty much a must. Most of our parts (medical implants and instruments) are datum features are pretty much suited for a 3-2-1 alignment such as plane-line-line or plane/cylinder-circle-circle and such.

Just my .02 on the subject

[Schrocknroll]

I'd give you a whole nickel for that.