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A
AK_1136252210-Marble
10-Marble
August 29, 2024
Solved

How do I Line up specific points on copies after pasting

  • August 29, 2024
  • 3 replies
  • 2876 views

Using Creo Parametric 10.0.2.0 Commercial.

 

I have created one quarter of a sketch that I want perfectly to my specifications.

 

The other three quarters should simply be a copy and rotate of 90, 180, and 270 degrees of the first quarter. The final sketch should then just be joining them together in a circle to close the sketch. Then, I want to create the part by extruding this sketch.

 

I successfully copy and paste my construction lines, my center point reference, and my actual lines.

I successfully rotate it 90 degrees.

 

The issue is, I can't get the end points to snap to each other to create a closed sketch!

 

My sketch is essentially a 90 degree arc with radius of 62.5 mm, but the first part of the arc is removed for a slot that goes into the circle.

 

I have tried clicking and dragging, but the point is the center point of the sketch which won't snap to where I need that center point to be.

 

I tried setting the vertical and horizontal dimensions going from center point to center point to 0 and 62.5..

 

I have tried using the Paste Tab in the ribbon and setting the parallel translation to 0 and the Normal translation to 62.5 (with rotation at -90/270 degrees). This should place it exactly where I need it, but it's always just a little bit off and won't complete the line. 

 

Finally, I set center points at (31.25, -31.25), (31.25, 31.25), (-31.25, 31.25), and (-31.25, -31.25) prior to copying and pasting and rotating, then clicking and dragging to these points I placed. This one LOOKED perfect... the lines were lined up exactly the way I expected. However, the sketch still has the red boxes indicating that the sketch is not closed. I tried adding a coincident constraint on the points to close the loop, but it said "invalid selection". 

 

How do I get these to line up and close my sketch?

 

I attached a copy of the failed model (NOTE: During the process, after I failed a couple times, I made a 1/4 version and connected it with lines to the center point and extruded that. Then I went back to the sketch and tried to do the copy/paste again. that's why there's an extrude with a failed regeneration in the model)

Best answer by tbraxton

Creo is not built to pattern within the sketch environment but there is a hack for an axial pattern. I am not suggesting that this is a good practice to use in Creo. IMO this is not a good way to use Creo to make this geometry.  See the below video on how to copy and rotate axisymmetric geometry within sketcher and use this to create solid geometry.

 

(view in My Videos)

3 replies

S
23-Emerald III
StephenW23-Emerald III
23-Emerald III
August 29, 2024

I don't know how to do it the way you are doing it.

The way I would do it is I would just do a simple round extrude to your overall diameter. Then I would sketch one of the slots, extrude to remove that material. Then using AXIS pattern, pattern that slot 4 times at 90 degrees.

You may have other reasons for doing it differently so if I am way off on my suggestion, sorry.

StephenW_0-1724963660370.png

 

    A
    AK_1136252210-MarbleAuthor
    10-Marble
    August 29, 2024

    Thank you for the suggestion. You are not "way off". I tried patterning (but incorrectly) also. This helps, I will give it a try but it may not work for everything I need to do.

     

    I have another part that will pair with this, but it will need to be slightly asymmetric so I don't think patterning will work for that one. However, I'll start a separate question for that one.

     

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire IIAnswer
    22-Sapphire II
    August 29, 2024

    Creo is not built to pattern within the sketch environment but there is a hack for an axial pattern. I am not suggesting that this is a good practice to use in Creo. IMO this is not a good way to use Creo to make this geometry.  See the below video on how to copy and rotate axisymmetric geometry within sketcher and use this to create solid geometry.

     

    (view in My Videos)

    A
    AK_1136252210-MarbleAuthor
    10-Marble
    August 29, 2024

    One of the things I tried was close to this. What did you do at 0:18 in the video to move the focal point of the pasted version to the center point of the arc? I can't tell from the video.

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire II
    22-Sapphire II
    August 29, 2024

    Select the target icon with and hold down the right mouse button to drag it to a new location.

    M
    mashton-215-Moonstone
    15-Moonstone
    September 4, 2024

    One way would be to mirror in the sketch your first quadrant then mirror again (in the sketch) the semi circle from the first mirror. You would probably need to use the corner tool to join the geometry up. Then extrude.

     

    However I think Stephen W's method would be how I would do it. The pattern can give you down the line advantages when you assemble parts in the slots.

     

    There are usually several ways of achieving the same result in CREO some better than others..

     

    Mirror in sketch is an oft overlooked sketch function that can be really useful and all you need is a centreline to mirror about. 

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire II
    22-Sapphire II
    September 4, 2024

    I fail to see how mirror planes/lines can be used to mirror quadrant 1 of the sketch to generate the remaining quadrants. If you know how to do this using the mirror function within sketcher, please post details.

    M
    mashton-215-Moonstone
    15-Moonstone
    September 4, 2024

    Yeah point taken you would need to be able to copy rotate the slot. 

    Pattern the slot after extruding the disc is the way to do it.

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