ACCEPTED SOLUTION
Accepted Solutions
You have some good recommendations from the previous posts. I agree in general keeping sketches simple is a good rule to live by as Steve mentioned.
Having said that you can generate complex shapes with simple sketches by using construction geometry to manage design intent within sketcher. This geneva cam is a good example of how to exploit the part symmetry by using a simple sketch (3 arcs and two straight lines in this example) and constraining them using construction geometry.
Here is a video illustrating how to exploit the part symmetry and create the solid model from the single sketch above as the starting point. I am not asserting that this is the best way to model this cam (it depends on your design intent) but it is illustrative of the application of construction geometry to use a simple sketch to create a more complex one and it be robust for modification of the model. The construction geometry for the sketch is indicated at the beginning of the video upon entering the sketcher.
That message typically means you have two lines on top of each other. You can use the overlapping geometry tool in sketcher to highlight the overlap. I am using 4.0 and it doesn't always highlight just the overlap and some trial and error is usually needed.
The other useful tool is to turn on Highlight Open Ends (next button down). This highlights ends of entities that are not paired with another end.
I am unable to open your file as it was created in a student version of CREO.
Pressing the Overlapping geometry button will highlight lines that are overlapping. In this case I intentionally created an extra line on top of the top line. The tool highlights the overlapping line and the lines on either side. If I select the top line and delete it the error should be resolved. and the sketch area will shade to show a closed loop.
Since I can not open your model I am not sure this is the issue. If the issue is sketcher symmetry then this applies, if the picture you posted represents your desired shape then this does not apply.
I strongly suggest gaining an understanding for the use of construction geometry in sketcher. This will save you a lot of difficulty once you employ it.
I would suggest using construction geometry in the sketch (centerline). I would sketch 1/8 of the cam rather than 1/4 as you have shown. Once you have that done you can mirror the sketch entities to get 1/4 of the CAM and impose symmetry on the sketch.
You have some good recommendations from the previous posts. I agree in general keeping sketches simple is a good rule to live by as Steve mentioned.
Having said that you can generate complex shapes with simple sketches by using construction geometry to manage design intent within sketcher. This geneva cam is a good example of how to exploit the part symmetry by using a simple sketch (3 arcs and two straight lines in this example) and constraining them using construction geometry.
Here is a video illustrating how to exploit the part symmetry and create the solid model from the single sketch above as the starting point. I am not asserting that this is the best way to model this cam (it depends on your design intent) but it is illustrative of the application of construction geometry to use a simple sketch to create a more complex one and it be robust for modification of the model. The construction geometry for the sketch is indicated at the beginning of the video upon entering the sketcher.
