Placing Datum Flags on Leader Lines / Attaching Datum Flags to FCFs - (WF5) 1

[random_guy]

Hi All,

I'm using WF5 and have always placed datums using the "old style" boxed callout or used the @[-A-@] technique. I'm trying to transition to the newer style (flags) and I keep hitting roadblocks. Here are the two main issues I've been having:

1. I can't get diametrical datums to attach to the leader lines of a dimension. i.e. datum -B- in this pic:

They will only attach to the opposite side of the dimension, on the circular feature.

2. I'm unable to get datums to attach to a feature control frame, as in -B- in this image:

If I create the gtol, attach it to the diameter, then attempt to attach the datum to the feature control frame, I get the following error: "Gtol is in a dimension. Must place in dimension"

This is very frustrating, as I have spent several hours trying to figure it out, to no avail. I've tried changing several drawing config options, as well as my config.pro options, and nothing is taking. Here are my current (what I assume relevant) config options:

asme_dtm_on_dia_dim_gtol - on dim
gtol_datum_placement_default - on bottom
gtol_datums - std asme
gtol_display_style - std
new_iso_set_datums - yes

Thanks in advance for any help you can give.



Wise men learn more from fools, than fools do from the wise.

 

[random_guy]

Some additional info for #2:

If I create the gtol as a free note, I can attach the datum to it. However, I cannot then attach the FCF to the diametrical dimension. I would have to relate the FCF to the dimension. It's an extra step and not a "clean" solution.

It seems that the GD&T within Pro/E is very poor. Perhaps someone here has some tricks they can throw my way.

Wise men learn more from fools, than fools do from the wise.

 

[random_guy]

Some additional info for #2:

If I create the gtol as a free note, I can attach the datum to it. However, I cannot then attach the FCF to the diametrical dimension. I would have to relate the FCF to the dimension. It's an extra step and not a "clean" solution.

It seems that the GD&T within Pro/E is very poor. Perhaps someone here has some tricks they can throw my way.

Wise men learn more from fools, than fools do from the wise.

 

[random_guy]

Figured out #2. The drawing config option:

asme_dtm_on_dia_dim_gtol - on dim

should be

asme_dtm_on_dia_dim_gtol - on gtol

Then the datum will attach to the FCF, and the FCF will attach to the dia.

Now if I can just figure out #1...

Wise men learn more from fools, than fools do from the wise.

 

[random_guy]

I was hoping someone would chime in... anyone?

Wise men learn more from fools, than fools do from the wise.

 

[giggity]

Number 1 is not possible unless you draw it in yourself. And it doesn't change with Creo 2.0.

You are right to be frustrated. PTC is still using the Datum tag methods from the ASME Y14.5-1994 standard and didn't change anything when 2009 came around. They a few other symbols and but they still haven't bothered with the rest of the standard. I am convinced they simply don't care about GD&T and are fine with the part of the user base that makes detailed drawings finding quick fixes and workarounds.

/rant over

 

[random_guy]

Thank you giggity.

Here is the thing though - #1 is not new to Y14.5-2009. That was included in Y14.5-1994. If you have the book handy, you can turn to p.92 for an example of it in the top drawing. It's also shown on p.141, fig. 5.10. I'm sure there are other instances, but those were two I ran across.

It's unacceptable, in my opinion, to not include GD&T features that were part of a standard that was released 15 years ago.

I suppose I will create a custom symbol as a workaround then. Thank you for your input.

Wise men learn more from fools, than fools do from the wise.

 

[giggity]

Thank you, nsgoldberg.

I would assume that the Pro/E designers didn't think to look through the standard for alternative methods. They only looked at page 43. This is probably the reason 2009 have a more in depth example section. Before you get to work on making your own symbols, check out this zip file some one made on the PTC forums.

File:
Forum Source

 

[random_guy]

Awesome, thanks. I'll check them out. I'm sure I'll still run across more issues, but at least now I know this is a universal problem, and it's not just me.

Wise men learn more from fools, than fools do from the wise.