Controlling Radius Size Within a Profile
Controlling Radius Size Within a Profile
(OP)
What is the best way to control the size of a radius within the boundaries of a profile?
In the attached sketch, the nominal line in blue is flanked by the min and max profile boundaries. An undesirable condition is shown in pink. What controls are best utilized to ensure that the corner radius of the measured part does not exceed the min/max radius of the profile limits? Specifying a locational tolerance for the center of the radius seems logical, but presents it's own limitations when measuring a semi-circle less than 180°
I can't seem to attach the file, so here's a direct link:
http:/ /img.photo bucket.com /albums/v2 08/jszymko wski/web/P rofile.jpg
In the attached sketch, the nominal line in blue is flanked by the min and max profile boundaries. An undesirable condition is shown in pink. What controls are best utilized to ensure that the corner radius of the measured part does not exceed the min/max radius of the profile limits? Specifying a locational tolerance for the center of the radius seems logical, but presents it's own limitations when measuring a semi-circle less than 180°
I can't seem to attach the file, so here's a direct link:
http:/





RE: Controlling Radius Size Within a Profile
Why not just apply a tolerance on the radii that is tighter than the profile tolerance? The inspector would have to check both the profile tolerance and the radius value. A true position tolerance would not mean anything.
Alternately, you could apply a tighter profile tolerance to the radii. What are you trying to accomplish?
JHG
RE: Controlling Radius Size Within a Profile
The application of a tolerance to the radius in addition to the all-around profile should accomplish my goal. The goal being to prevent a large radius occuring at MMC or a very small radius occuring at LMC such as depicted in the picture.
I had thought of the solution you provided, but it seemed somehow unorthodox and perhaps invalid.
Thanks.
RE: Controlling Radius Size Within a Profile
RE: Controlling Radius Size Within a Profile
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Controlling Radius Size Within a Profile
RE: Controlling Radius Size Within a Profile
RE: Controlling Radius Size Within a Profile
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RE: Controlling Radius Size Within a Profile
A smaller profile tolerance on the radii allows a step between the radii and the straight sides. Does this matter?
What geometry are you trying to achieve?
JHG
RE: Controlling Radius Size Within a Profile
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RE: Controlling Radius Size Within a Profile
I think your concerns are slightly misguided, in applying the profile and additionally the radius.
Hope this might be of some help.
RE: Controlling Radius Size Within a Profile
RE: Controlling Radius Size Within a Profile
Remember that even though we all do what we can to adhere to the standard, there are times when a situation calls for a very acceptable option and this is a standard symbology supplement note (see para 3.2) to achieve what we need for functionality. Also another higher level example of further clarification or supplement is the GM/Chrysler auto industries addendum.
For your particular scenario I would use a Local NOTE on the drawing and a detail view pictorial depiction of the tolerance zone using basics and phantom lines as earlier stated. I believe if you have access to, and my description isn't clear enough, the aforementioned figure from the draft standard is a catalyst for you to get the idea on how to apply this.
As long as you are clear and unambiguous, it is perfectly acceptable to supplement or amend the standard to address your particular situation.
I hope this helps.
RE: Controlling Radius Size Within a Profile
What if the radius between D and E were controlled with a controlled radius rather than Profile?
RE: Controlling Radius Size Within a Profile
The controlled radius in my understanding, vaguely defines a refined surface finish on the radius feature itself. It does not in my opinion address the transitions at the two tangent surfaces. Now one could interpret it different then me and there in lies the problem it is not in its current state a clear enough spec and leads to ambiguity. Therefore, I suggested to the OP what I would do, to specify unambiguously the functional intent. We are always allowed this option for things that aren't clearly defined in the standard.
Which, by the way we don't really know what the actual function of this radii is. So as always with out all the info, this is purely speculation.
RE: Controlling Radius Size Within a Profile
I would suggest making the radius itself basic and rely solely on profiles if this is the concern. It also elimenates the apparent double dim'ing.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Controlling Radius Size Within a Profile
I believe that if you take a look at Par 2.15.2 of Y14.5 you will agree that CR will do task you are desiring.
RE: Controlling Radius Size Within a Profile
RE: Controlling Radius Size Within a Profile
What is there about the original profile tolerance that causes a problem?. Is it interference, your misgiving about the resultance appearance or concerns for the inspectors being able to verify?
RE: Controlling Radius Size Within a Profile
Again, hope this helps. Have nice memorial weekend.