Autodesk Inventor

[#1]

Hello All,

In Autodesk Inventor 2013. I have a simple cylinder extrusion with a rectangle attached to the cylinder. Drawing file attached(extrusion 1). Whenever I apply a chamfer to one of the straight edges, Inventor generates negative taper on the cylinder wall (if you zoom in with a window, you can clearly see that their are two lines on the cylinder wall where the chamfer edges was applied).

Is there anyway to prevent this from happening? This gives me all sorts of problem in my CAM software because the tool is trying to machine in an area it cannot get to.

As a work around I have to create a new part file with a small gap between the cylinder and the chamfered edges. This keeps the cylinder edges nice and straight with no taper. The work around is attached as well. Since the tool can't go that far into the corner given the radius of the tool, the gap has no affect on me generating code. I have tried many different ways on creating this part with chamfers with no luck. Once the chamfer is generated, it should match the profile of the cylinder. This is absurd.

[#2]

CAn you post a screen grab of the problem. I'm not seeing it.

[#3]

Set your view to wireframe and zoom in or scroll in to where the cylinder and chamfered edge meets. You can see it clear as day.

[#4]

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dcmorgan wrote:

 You can see it clear as day.

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I don't see it.  Furthermore I don't understand how the "workaround" solves the "problem".

Can you attach screen shot of what you are seeing?

OK, I finally found it.  You could have included the information to look at it from Front view.

Edit:  well now I'm not sure I'm seeing anything other than a graphics artifact.

[#5]

In wireframe, show me where the taper starts. If the entire surface tapers, why is the intersection of the retangle and cylinder 90° to the base?

[#6]

I would normally palm it off to graphics, but since your CAM software complains, try the following.

Edit Extrusion9 and set it to a new solid.

It appears to graphically solve the issue, but I am not sure what your CAM software will do?

[#7]

ok thanks, I will try that

[#8]

You might try modeling it as a multipart model, do your chamfers on the appropriate solid and then combine the two solids when done. Could not open yours, am using 2011, but you should be able to open my sample if you are running a later version.