How to trim an extruded boss?

[tt_raptor_90]

Hi,

I am going to attach the tail portion of a plane that I am designing. I made the rudder airfoil by extruding the sketches. Now, I want to trim the part that is sticking out due to the straight extrusion but I cannot figure it out. I tried trimming surface but that does not work. Any help will be appreciated.

Thanks

Sebastian

[canadamaxxer]

I have a simple solution for you, there may be fancier ways, but this how I have trimmed many drawings simply: click on the triangular area you wish to remove (I would do this from between the horizontal ribs so I could select the proper face) this will become the plane you will draw on, and open a 2D drawing. Draw a polygon that follows the angle of the vertical spar and encompasses all of the areas you wish to remove. Use the extruded cut tool and select "through all" for direction 1 and a distance dimension that will remove the desired material, for direction 2. All things being equal, you have removed all of the offending material

[JFettig]

Usually whaat I do is similar to what he described but I click the little triangular area, hit extruded cut, then hit convert geometry and check, you can do it for all on one side at once then mirror, or just extrude through both ways.

Jon

[tt_raptor_90]

Hey,

Thanks a lot for the help. That was exactly what I was looking for. Instead of drawing a surface to cut of the excess, I made that extruded cut and it trimmed everything.

Cheers

Sebastian

[tt_raptor_90]

Hey,

A new problem. This time I need to trim something that changes shape on 2 axis. From the pictures, the airfoil gets thinner towards the rear of the rudder, but also, the airfoil get's thinner as you go higher up the rudder. Now my problem is that I draw a line that goes from the base to the top of the rudder, and then I can't get the extrude cut surface to angle inward towards the end of the rudder, it just goes straight back. I thought that the angle option would work, but it does not seem to make any difference to the shape of the surface that is previewed. Thanks for the help.

Sebastian

[canadamaxxer]

You may have to change the way you draw the spars to incorporate a taper or offset. The "loft" feature will work for you for this problem. After having created a plane parallel to the 2d object and having drawn a new 2d object either offset or smaller in dimension to create a taper on the new plane, use the loft command to create the new 3d object. You can use the current drawing to measure the offset or taper required, and then let the software rebuild the assembly with the new lofted parts.

I can't think of any other way to accomplish your goal....