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- Creo (Previous to May 2018)
- Creo Modeling Questions
- model a rectangular to round transition

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Dec 09, 2009
05:43 PM

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Dec 09, 2009
05:43 PM

model a rectangular to round transition

I thought I could model a transition with a straight blend. It's complaining about having unequal number of segments in the two sketches. ?????

David Haigh

Phone: 925-424-3931

Fax: 925-423-7496

Lawrence Livermore National Lab

7000 East Ave, L-362

Livermore, CA 94550

David Haigh

Phone: 925-424-3931

Fax: 925-423-7496

Lawrence Livermore National Lab

7000 East Ave, L-362

Livermore, CA 94550

5 REPLIES 5

Dec 09, 2009
06:01 PM

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Dec 09, 2009
06:01 PM

Thanks, I can now get a transition, but it's not correct.

A sheet metal transition has 4 triangular flat sides with triangular folds in between to conform to the circle. I don't need to show all the folds, but I do want the edges hi-lited in red on the attached image.

David Haigh

Phone: 925-424-3931

Fax: 925-423-7496

Lawrence Livermore National Lab

7000 East Ave, L-362

Livermore, CA 94550

A sheet metal transition has 4 triangular flat sides with triangular folds in between to conform to the circle. I don't need to show all the folds, but I do want the edges hi-lited in red on the attached image.

David Haigh

Phone: 925-424-3931

Fax: 925-423-7496

Lawrence Livermore National Lab

7000 East Ave, L-362

Livermore, CA 94550

Dec 10, 2009
08:51 AM

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Dec 10, 2009
08:51 AM

Yes. This is one of the constrains of this feature.

The blend needs to have sections comprised of the same number of segments.

So, if you have a circle and a square for example. You "divide" the circle

in 4 segments to have the same number of segments as the square.

It is also important the starting point. (RMC "Start Point"), if not

chosen right the blend is twisted.

You can divide a sketched feature with "Divide an entity at the point of

selection"

See snapshot, hope it goes thru.

Hope it helps.

The blend needs to have sections comprised of the same number of segments.

So, if you have a circle and a square for example. You "divide" the circle

in 4 segments to have the same number of segments as the square.

It is also important the starting point. (RMC "Start Point"), if not

chosen right the blend is twisted.

You can divide a sketched feature with "Divide an entity at the point of

selection"

See snapshot, hope it goes thru.

Hope it helps.

Dec 10, 2009
10:01 AM

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Dec 10, 2009
10:01 AM

That is not quite how the resulting surface looks like - it does not have these edges, but smooth transitions.

To get something like that, You have to use

- either true surfaces and create the solid from those

- or add very small radii to the rectangle corners and split the circle into 8 arcs of different lengths.

Dec 10, 2009
10:15 AM

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Dec 10, 2009
10:15 AM

If you are blinding a circle to a square the circle needs to be split into

four arcs. The shape will be blended from the vertices of the square to

the vertices on the circle. I would recommend that you experiment with

this to see how this effects your blend by changing the included angle of

the arc segments, and toy with the other blend options to see how this

feature works.

Bob Frindt

Sr. Designer

Parker Hannifin Corporation

Parker Aerospace

Gas Turbine Fuel Systems Division

9200 Tyler Boulevard

Mentor, OH 44060 USA

direct (440) 954-8159

four arcs. The shape will be blended from the vertices of the square to

the vertices on the circle. I would recommend that you experiment with

this to see how this effects your blend by changing the included angle of

the arc segments, and toy with the other blend options to see how this

feature works.

Bob Frindt

Sr. Designer

Parker Hannifin Corporation

Parker Aerospace

Gas Turbine Fuel Systems Division

9200 Tyler Boulevard

Mentor, OH 44060 USA

direct (440) 954-8159

Dec 10, 2009
11:26 AM

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Dec 10, 2009
11:26 AM

It looks like you have lots of help on how to create it, but here is the

link to how sheet metal people will want it created. If you plan to have

this be a true sheet metal part I would suggest you create it in

pro/sheetmetal and make sure it will flatten for you so you can send it out

to a vendor with confidence.

link to how sheet metal people will want it created. If you plan to have

this be a true sheet metal part I would suggest you create it in

pro/sheetmetal and make sure it will flatten for you so you can send it out

to a vendor with confidence.