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How to model round corner of a slot with various chamfer length?

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How to model round corner of a slot with various chamfer length?

I am trying to make the model of the attached images. My main problem is the two end round corners. In Solidworks, I lofted cut this with two variable sections and two variable guides, however, apparently in Creo I cannot have multiple sections and multiple trajectories, as I tried to blend top section of the slot with the second below section on an angled plane and it didn't work.

I also tried chamfering with two various variables and used transition point somewhere at the middle of the round end part of the slot, and it didn't work either.

Anyone has an idea how can I do this?

13 REPLIES 13

Re: How to model round corner of a slot with various chamfer length?

In looking at this, I'm not certain you need multiple trajectories. My first guess would be that a single trajectory with multiple sections should do the trick (Swept Blend).

Re: How to model round corner of a slot with various chamfer length?

It looks like the slot is offset from the chamfer. Maybe make the chamfer to a small slot and then extrude the offset slot.

I think this is an artifact of the toolmaker where the chamfer was made first (boss) and the slot was added afterward and came out off center.

Re: How to model round corner of a slot with various chamfer length?

Yes you shouldn't need two trajectories and a swept blend should do it. A boundary blend surface is also another avenue with the top and bottom of the race track as your first direction curves and the different slopes between them at each tangency of the ends as your second direction curves should do it too. If I can't create the feature with a simple function I tend to create boundary blends so I have good control of the geometry and I can also create all my curves in individual features ahead of time then just select them as needed in the surface creation. It might be over kill, but works for me.

Re: How to model round corner of a slot with various chamfer length?

You could just do the individual chamfers on the two straight edges (you can stop the chamfers at the vertices at the end of the straight lines) and sweep to connect the two on the 180 degree half circles.

Re: How to model round corner of a slot with various chamfer length?

Does this look right?

cham1.JPGcham2.JPG

Re: How to model round corner of a slot with various chamfer length?

It does actually. Is it possible for you to upload the cad model?

Thanks everyone else, I worked with Solidworks all the time and recently started Creo, that's why I don't have lots of experience. I understand what you say in words, my only problem is when I start trying them, it won't work.

Re: How to model round corner of a slot with various chamfer length?

The model is basically what Antonius described above.

Re: How to model round corner of a slot with various chamfer length?

It seems there's a transition between radius and chamfer.

Cattura.PNG

Re: How to model round corner of a slot with various chamfer length?

Just wanted to say thanks everyone. I got it done last night.

Cheers,