Limited Dimension Drawings and Profile callouts

[[Ja...]]

We are starting to see a lot of Limited Dimension Drawings with a note stating "ALL UNDIMENSIONED FEATURES SHALL LIE WITHIN A PROFILE TOLERANCE ZONE OF .010 RELATIVE TO DATUMS A, B, AND C." I would think you would use Profile or Line Profile, but those eliminate a lot of what I am measuring. The one part in question has a lot of radii on it, and I have to do Cylinders to use Profile as Circle is not an available option. Can True Position be used instead? If so, will the tolerance still be .010 or should it be 1/2 that, at .005? Some features require Profile of a flat surface, but it only is about .050" wide so I would have to create a Plane to use Profile, where a line would be better used.

How is everyone else handling these issues on LDD's?

[[Ia...]]

If you don't have freeform, just take a bunch of space points on all the features, using the alignment to ABC, and then report the point distance with plus/minus .005. You can use the min/max characteristic and mask the point distances to clean up the report.

[[Ch...]]

I've seen quite a few of these.
Very easy for Engineering, more challenging for us.

Once you have FreeForm, it will get a bit easier.

The issue I find, is if you give one of these prints to 3 Programmers, you'll get 3 different reports. They should clarify what *really* needs to be inspected, etc.

[[Je...]]

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I totally agree. Designers who include this type of generic control are usually not considering the cost of time required for this depth of inspection.


Jeff Frodermann
Meier Tool & Engineering
Anoka, Minnesota
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[[Pe...]]

One thing I do (no curve/no freeform):

For corners, still extract them as a cylinder, but just put a single scanning arc across them. As long as the point density is enough that it can theoretically try to calculate the cylinder, it will still profile.

You can do the same thing for narrow planes, extracting as plane but measuring it with a single scanned line, and it will still profile. You just can't use these features for any other characteristics since it will give some rather goofy actuals especially in regards to the A1 A2.

[[Ri...]]

Profile is based on Location, Size and Form.
True position will not include Size and or Form.
Back in the day, I've used True Position plus Deviation from Size and Form.
Use PCM to recall the highest value in a Result Element and report that as the profile.

[[Er...]]

I just do a General Surface in ABC. Pick random points where the process may vary. Then I just use Profile like the print is calling for.

[[Mi...]]

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Hi Ian,
I've come across your comment for limited dimension prints and tried the space point method you have mentioned here. I created a Min/Max characteristic to clean up the report as you said and for some reason even with the point characteristic masked it still shows up in the report. Should this be appearing in the report or did I do something incorrectly? We are still using the Calypso legacy reports so I'm not sure if that is the issue or not.

Regards,

FORUM QUESTION.gif

[[To...]]

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Are you generating this report through Multiple Reports? If so, the dimensions you don't want to see are marked in the Multiple Reports window (at upper right) and activated by clicking the Hide checkbox.

[[Ri...]]

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This is very typical in the defense/aerospace industry. Makes it easier on the drafter.

Most of these guys are doing single points.

Depending on the size of the part, you might be able to use either a laser 3d scanner (TSCAN Hawk) or 3d bluelight scanner (ATOS).