Ordinate Dimensioning - When to use 1

[cpdpeckh]

When is ordinate dimensioning appropriate and when is it inappropriate?

My initial throughts are:

APPROPRIATE USE:
-Flat plate
-Single horizontal origin and single vertical origin
-?

INNAPROPRIATE USE:
-Hole patterns
-?

Please offer your thoughts.

Don

 

[ewh]

ringman,
I apologize for not stating my position better. It was Fri afternoon, and my mind was already out of here.
When I suggested that ordinate dimensions and GD&T could work together, I had assumed that any ordinate dimensions used would be basic.

 

[cpdpeckh]

I've reached the following conclusion based on (and paraphrasing) the above comments:

-It is acceptable but not necessarily desirable to mix ordinate and other types of dimensioning. This requires judgment on the part of the designer/drafter.

In order to guide the designers/drafters where I work my thoughts are to provide examples of appropriate and inappropriate use of ordinate dimensioning.

Thanks,
Don

 

[ringman]

cpdpeckh,

I hope you were able to glean something from this.

It is my opinions that Y14.5 in general, advocates the strict usage of GD&T, in-as-much as there is no standard for the strict interpretation of +/- tolerancing. That is to say you don't know which end to start for your measurement.

Opinion ONLY.