How would I go about obtaining this measurement???

[[Za...]]

It's me again 😃 😃


How would I go about getting this highlighted measurement (#2)? I have the 1.25 Radius measured as a cylinder as well as the .314 bore. I'm just trying to figure out how to project to the point to get that 1.549 measurement.

Any help is appreciated,

Zach

[[Cl...]]

Top surface plane spatial rotation & Z origin. 1.250 R XY zero, (constrain X&Y axis).
Planar rotate the .314 dia hole (Y+) Cartesian distance 1.250 radius to .314 hole.

[[De...]]

Make a new alignment from Menu -> Resources -> Utilities -> Alignment

Assuming the part is oriented as it is in the drawing.

Use the top face for a spatial alignment Z+.
Use the face that is parallel with dimension 5's extension line for planar rotation to Y-.
Use the 0.314 hole as your X Y Zero.
Use the top face for Z Zero.

Now set the alignment for the 1.250 Radius to be that alignment.

Now your Y value should be 1.549.

But why are you measuring a reference dimension?

[[Jo...]]

I hate prints like this. All the dimensions are alignment dependent, but don't specify what is the clocking feature. A hint to function would be nice. This would be a good candidate for Profile callout, and be done.

[[Ke...]]

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Requests for inspecting reference dimensions happen all of the time. It's usually for troubleshooting.

[[Jo...]]

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I have also "reported" those as a construction feature used to measure a controlled dimension. In this case you might reference Item 2 (and Item 6)as the fixed center and report the min/max radial distance of Item 3 .

[[Za...]]

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Sorry, I should have included how I have it oriented in Calypso. This is the way we had to fixture it to access all of the machined features

[[Za...]]

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I think this is calculating the distance from bore center to bore center. The cad keeps pulling the nominal in at 1.560 instead of 1.549.

[[De...]]

I believe that the method Clark gave would measure the distance between centers. My guess is he did not notice they were not in line with each other.

For the method I gave, based on how you have now shown the part aligned, the only thing you would have to change is make the face be X+ instead of Y- for planar rotation. Now that I see the 0.314 hole is through two walls though, I would probably use that as spatial.

And Keith, I guess I should have said something more like, "Do you have to measure this since it is a reference dimension?".

My thinking was not so much never measure a reference dimension, but - hey maybe you could avoid having to measure this since it is more of a pain to check than normal.

[[Cl...]]

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Yes sir you are correct, missed that. That's what happens when your in a hurry and assume you know what your looking at 😃

[[Za...]]

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Thanks Derek! I never even took your comment about the reference measurement in a negative manner since you offered the solution with it.

One thing I noticed is that the nominal automatically comes in as 1.548559 instead of 1.549. Is this due to not being able to scan the entire 1.250 Radius? And if so, is there a way to get around this?

EDIT: The feature is well within the +/- .005" tolerance either way so it's not super important, but if there is a way to do this correctly, I'd still love to hear it.

Thanks again,

Zach

[[Ia...]]

Some prints use rounded numbers for their dimensions.

[[Za...]]

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I've seen that before, but I figured .0005" was quite a bit to round up even with the .005" tolerance.

[[Me...]]

This dimension is fairly simple if you have that Ø .314 bore as your origin, a CAD model and an accurate Base Alignment. Yet another amazing use of Constraining... If said alignment is correct, then all you have to do is check the "Y" location box in the feature, inside the created characteristic for that location, then check the Radius constraint box. Easy Peasy.

[[Za...]]

What is the best way to go about obtaining #7? I'm trying to create an intersection between the radius/plane or radius/radius and take the distance from the intersection to the .314" circle, but Calypso is saying there's no intersection?

[[Za...]]

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Better yet, does anybody have any good resources for obtaining some of these crazy dimensions that are from tangents and intersections between radii? I work mostly with square and rectangle parts that are fairly simple. However, we're starting to get more of these cast parts and some other weird shaped parts. My novice level of CMM programming knowledge needs some work still, but I definitely do not mind reading up on something if someone has a recommendation. 😃

[[De...]]

The only resource I know of for things like that is this forum.

An intersection is the correct way to go about it.

You cannot make an intersection between a cylinder and a plane however.

You CAN make an intersection between a Circle and a plane though.

So recall the points from one of the scan paths into a cylinder to make your intersection.


If you want the line where the plane and the cylinder intersect, then make two circles top and bottom.

Create two circles and recall the points from each of your paths from your cylinder into them.

Then you can make two intersections from those two circles and the plane.

Then you can make a 3D line by using recall on those two intersections.

[[Da...]]

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I would consider that routine. We have some customers that will round .0049" on a ±.010" dimension. Drives me batty.

[[Za...]]

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Wow, that's crazy 🤣