Broken Dia and callout?
Broken Dia and callout?
(OP)
There seems to be some confusion here as to the correct callout for a broken diameter. We have a round plate with a ID diameter going through the center. This ID diameter is broken by 4 slots.
Is it correct to show the dimensions as "4X Ø5.00" or if its a radius as "4X R2.25"? Or can you just show the dimension without the "4X" and it is assumed the same diameter and feature?
Thanks
Is it correct to show the dimensions as "4X Ø5.00" or if its a radius as "4X R2.25"? Or can you just show the dimension without the "4X" and it is assumed the same diameter and feature?
Thanks





RE: Broken Dia and callout?
RE: Broken Dia and callout?
I would dim as one dia.
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
To show that they share the same center (if you wish), reflect them in a positional tolerance using MMC but without a datum. This would reflect 4 holes in alignment.
If you wish to have the pattern of 4 holes relative to a datum(s), you could reflect them in positional to the datums.
Hope this helps.
DD
RE: Broken Dia and callout?
RyanCR, can you show us a pic of the part?
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
If one does not want the 4 features in the pattern to A & B (bottom section of the feature control frame),look at the top of page 149 showing the 2 holes (different sizes here) relative to each other without a reference datum.
DD
RE: Broken Dia and callout?
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RE: Broken Dia and callout?
So now i'm confused. Which is it RyanCR? I think we really need some kind of a picture here.
RE: Broken Dia and callout?
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
Image a washer, with 4 evenly spaced ID slots, which break the ID diameter into 4 equal segments (The segments don't need to be equal).
I believe that the ID diameter needs to have a "4X" associated to it, but a coworker does not.
I do disagree that the way the part is manufactured should have anything to do with the dimension call-out. Two different shops may create the part in different ways. It seems to me that there should be a standard on how this callout is shown. I always believed that if the dia or radius was broken, that a number went in front of the dimension.
Thanks,
RE: Broken Dia and callout?
See FAQ on how to do it.
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
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RE: Broken Dia and callout?
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
RE: Broken Dia and callout?
thanks,
RE: Broken Dia and callout?
The purpose of a drawing is to CONCISELY define a part. A single diameter dimension (with extension segments through the slots, if they aren't too small) will define this clearly, more so than 4X R, and will be easier to control with GD&T.
RE: Broken Dia and callout?
This is all I could find.
RE: Broken Dia and callout?
The second example is Fig 5-18. The diameter is not complete, being broken by the tab, but it is still called out as a diameter, although it is technically a radius.
RE: Broken Dia and callout?
It is similar to the ID and OD of a part similar to a washer. You don't always see control frames controlling there relationship to one another. If there are no control frames, then technically the two diameters do not have to be concentric. Many people I have talked to seem to think there is a default positional relationship, but there isn't. I just wanted to know if the diameter/radius are assumed one, if not otherwise specified.
Thanks again for the responses
RE: Broken Dia and callout?
I agree with ewh.
Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716
RE: Broken Dia and callout?
If the arcs are not meant to be equal and concentric then label them each with a radius. If they are concentric and equal (and in this case with a full circle that is concentric to the inner circle), use a single dia. callout and by not telling them otherwise, you HAVE told them that they are equal and concentric. Don't try to confuse the issue by putting 6x in front and opening it up to a debate just like we are having here.