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Eivind_Hansen1-Visitor
1-Visitor
May 9, 2014
Question

Datum features & datum frames/targets

  • May 9, 2014
  • 1 reply
  • 5734 views

Hi, I can't get Creo to show the datum feature the way I like, I have a single datum frame/target on a part and will like to simplify the indication as shown in the picture below (ref, ISO 5459). Anybody know if this is possible?

1.jpg

The only way I can achieve a result that comply with ISO 5459 in my situation is if I show the datum feature indication in another view/projection, attached to the surface, then uses a datum frame/target. The issue I have with this is that I can not find a god solution regarding adding the datum target name/number (A1) close to the datum feature indicator, as shown below. Sure I can add a note, but since I can not relate this note to the datum feature, it is not a robust metode....

2.jpg

Any good ideas?


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    1 reply

    S
    ScottWyatt1-Visitor
    1-Visitor
    May 12, 2014

    I don't think what you want to do is the proper representation of datum targets.

    http://www.roymech.co.uk/images/Geom_DT_3.gif

    This is an image from the this link. He uses the 5459 standard and you can see that for datum target area you use the datum target symbol with a leader to the perimeter of the area and no arrow. For the side view of the part you would use the datum.

    E
    Eivind_Hansen1-VisitorAuthor
    1-Visitor
    May 13, 2014

    Hi, thanks for the reply...

    I don't know if you have read the ISO 5459:2011 standard, but this clearly states that the representation I want (first pic. in original post) is a correct simplification of the drawing indicator whenever there is only one datum target. This is the way I want it to show, but I can not achieve this in any good and robust way in Creo (the picture is actually a copy from the ISO 5459:2011 standard). So in the pic you are refereeing to, this method would only be valid for datum target C1, but they have chosen to show the drawing indicator in the traditional way.

    Regarding the leader with or without dot/arrow and termination of this;

    • When it is a datum target point or line (on a not hidden surface) you can terminate the solid leader with or without an arrow, if datum target is on a hidden surface the leader should be dashed and terminated with no arrow
    • When it is a datum target area (on a not hidden surface) it should be a solid leader terminated with a dot, if the datum target is on a hidden surface the leader should be dashed and terminated with an open circle.

    Also, in the pic, and link you are referring to do not comply with Rule 4 of ISO 5459:2011;

    If a single datum feature is established from one or more datum targets belonging to only one surface, then

    the datum feature identifier identifying the surface shall be repeated close to the datum indicator, followed by

    the list of numbers (separated by commas) identifying the targets (see Figure 20). Each individual datum

    target shall be identified by a datum target indicator, indicating the datum feature identifier, the number of the

    datum target and, if applicable, the dimensions of the datum target.13-05-2014+07-30-58.jpg

    This is actually my other issue, since I can't figure out a way do the simplified drawing indication, I am left with the traditional way, but I can not find any good and robust way of complying with Rule 4, the only way I can see is by adding the datum feature identifiers in a note, and placing this close to the datum indicator... which is not a good practice, especially since I can not relate this note to the datum indicator.

    However, I see that the web page was last updated in 2010, and the latest version of ISO 5459 is from 2011, so the info on the web page may be a former practices.

    I am quite sure that the representation I want is complying with ISO 5459 as stated above, but please feel free to bring inputs regarding this.

    But first and moast I am looking for ways to actually show and do this in a Creo drawing, in a robust and easy way, which I am at the moment strouggeling to find...

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    dschenken1-Visitor
    1-Visitor
    May 13, 2014

    If this is created as a datum curve feature in the model, then it would at least be robust. Being parametric, the height of the leader and the location could be adjusted easily, unlike a symbol.

    I hope someone has a better suggestion.

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