Construct Circle between circle pattern

[[Mi...]]

Hello Everyone, I'm having trouble constructing a center circle between a circle pattern. I'm able to recall the circle points to construct a center circle but not with the center diameter I am looking for. If maybe theirs a way to recall edge points on a Radii to construct a circle? I've ran out of ideas. I hope someone can help, thanks.

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[[Ma...]]

I would construct two theoretical plane parallel to X and Z axis. Then get the intersection from the circles. Now use recall to create the inner circle.

[[Mi...]]

Great Idea Mark, ill try that. by the sound of it, I think that might just work. I'll let you know how it goes

Thank you

[[Ma...]]

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Be aware that doing this will be the intersection for the least squared circle and may not reflect the true dimension. A curve may be better.

[[Ma...]]

What about circle evaluated as max inscribed and recall those four cylinders? But i don't know what is more important - the center or diameter.

[[Mi...]]

The plane + cylinder intersecting point recall projected under the cylinder radius. @Martin Jansky the circle diameter is what I'm most concerned with

[[Da...]]

You are recalling Cylinders that have axis to the circle
you need to change that to circles or points
theoretical plane that intersect each cylinder axis then recall those 4 points in to the center circle.

[[Me...]]

Theoretical planes don't guarantee you're measuring to the apex of the circles. If you have curve I'd measure them as curves and use the max/min points in each axis to create my center diameter.

[[Ma...]]

If it will be measured by curve then you can recall all points and evaluate max inscribed too. But what purpose of it?
It looks like it is measured outside, so this recalling won't solve caliper usage.

Your method - recalling centers of cylinders can be used, but you must create another circle and paste nominals of center from recalled circle and then edit its radius ( so 1. circle recalled from cylinders / 2. theoretical circle with PCM/Formula for X,Y,Z from 1. circle )

[[Da...]]

That is true if you are concerned about the max min you can check with the plane at both points
But I'm not sure why the Diameter that is derived for the part matters it is not GD&T or GPS callout so envelop rule really doesn't apply. If it was called out correctly it would also need define the point that the diameter is derived at.

[[Mi...]]

Bingo, thanks for all the help. I ended up recalling the 4 cylinders as a circle, recalled the position and added the Caliper Min/Min distance in the X direction as the Diameter formula. I hope that was the right way 😕

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[[Ri...]]

There are a lot of different ways to skin the kitten. A lot of it depends on the tolerance.

You could have just directly measured it with points that self-centered into the bottom of the valley.

[[Da...]]

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You also could have used formulas to control that probing point to the center line of the circles.
But if your question is measured right per GD&T or GPS then the answer is "not defined"
So you are differently not wrong.

[[SH...]]

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That might be the functional requirements of the part.

[[SH...]]

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Why does your Y value shows 90,it should be zero??

[[SH...]]

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How does it crack gdnt rules can you explain??
Which rule you are talking about?.
I don't think it will be a rule number 1 and 2, so you are talking about either Taylor principle or the fundamental rule explain in the section 4 of y 14.5 2018.

[[Ma...]]

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Y value is representing depth value - look at XYZ arrow direction.

[[SH...]]

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IMG_20200920_205546.jpg

[[SH...]]

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How can I work with self centred probe?. This option is available for fixed head.

[[Da...]]

What is the tolerance on the derived circle ? ( diam., and loc. ?)

[[Da...]]

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I see you have 2019 version. I have no experience with it, but try to play around with recalling 4 cylinders into "parallel cylinder" (AFC, I think it's in the Features -> Special Geometries)