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drafting on feature. - Drawing interpretation. 3

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Alberto Ramirez

Alberto Ramirez

Automotive
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Nov 6, 2018
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Good Day,

I have this question that is confusing me.
On the following drawing there is this CC - 15 ± 0.1 (Datum C)
According with the designer, this part has a draft, he make reference to a "Drafting standards - ASME Y14.5"
Where he indicates that the feature doesn't control size and form, this mean, part can be out of spec, dimension and tolerances not apply on draft part.
For more explanation see ppt attached.

According with the drawing there is not a draft tolerance and because "Drafting standards" allow to be out of spec.
On cad there is not draft specified either.

In your experience, how this should be interpreted.
Thanks!


Drawing_review_tvv4vg.jpg
 
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The implied angles have no effect on measuring the width.

The feature is controlled by the dimension and the dimension controls the size and the maximum form limit

There are other things wrong with the drawing.

Also - the drawing was made with PTC Pro/E or Creo. Not that it makes a difference, but I know these things.
 
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Two questions:
1.) If a draft is allowed then why it is not specified with” +DFT”, ”–DFT” or “DFT INCL” as per ASME Y14.8?
2.)Why you have to fit the part in a perfect square gage? Why not only within an envelope or perfect two parallel plane 15.1 apart?

And one observation: datum C is the middle plane driven from datum feature C and not one of the sides (right side as shown in your power point presentation)
 
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