Tapered Extrude Problem
The command that you need to use is modify-draft.
But because of the complexity of your imported sketch it has created countless faces, so I think you will struggle too much with the command.
I would try a couple of things first. Instead of importing the sketch in from Rhino, rather extrude the profile as a surface in Rhino, and then open it directly in Fusion. Hopefully this will give you a smoother profile.
Or use your imported sketch as a reference only and re-draw the profile in Fusion. This might take you 1/2 hour. But it will save you much time and frustration when it comes to using the profile and you will get a much better end result.
Rhinos interpretation of DXFs when it exports them is in my opinion very poor.
These setting will give you quite good exports from Rhino as a DXF. These setting seem to export splines quite well , Note the setting to explode polycurves and split curves at kinks. Can you share the original Rhino file? You'll need to ZIP it to upload to this forum.
Mark
Mark Hughes
Owner, Hughes Tooling
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Not sure the curve tessellation options do anything if you have Simplify unchecked. I found I needed explode polycurves checked because a mix of lines, arcs and splines in one curve caused problems, think it was multi spline curves that caused the most problems.
Mark
Mark Hughes
Owner, Hughes Tooling
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This refinement to the export characteristics of Rhino looks really promising. I used your settings and brought in my image. The sketch information looks really clean and it appears to be a closed profile. However, I got the attached warning when I imported it and can't seem to generate an extrude from the result. Any thoughts are appreciated.
The file link is here: https://a360.co/3ev5LlH
I have also attached a simplified Rhino file. You will notice there are two closely spaced and parallel polylines that indicated the top and the bottom of the drafted surface. As per our discussion, I am working with the outer one and trying to create a tapered extruded void. Strangely, the polylines in the other rows above have functioned fine. Thank you for all your help. Invaluable.
The original curves don't look too bad but the offset ones are not good (these are the ones giving the error in Fusion). This is always a problem with offsetting splines especially in a polly curve.
The exturde from the original curves look a lot better using the export setting I show above. It still doesn't work with a taper though. What do you need the taper for. Are you going to machine the part, if so does it actually need the taper?
Mark Hughes
Owner, Hughes Tooling
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The mill produced will be used to cast a polyurethane rubber mold for some concrete work. See attached images of a sample prototype.
Yes, the offset profile is problematic for extrudes. I'm not planning on using that for any extrude operations. Instead, this inner line will be the path for a trace command during manufacturing. I am using a tapered bit to perform the milling around the perimeter of all the pockets. Right now, I am simply trying to define the model and this one extrude command is being problematic.
Looks like you were able to accomplish an extrude command with that problematic polyline. That is great! I wasn't able to accomplish even that. I wonder what you did differently than me? Thank you for all the help thus far.
Looking at what you're doing you don't need to model the tapered extrude. If you use 2d contoured and setup a cutter with the correct angle the offset for the taper will be calculated for each depth. You could even use a parallel cutter, I seem to remember 2d pocket and contour have options for taper pocket if you use multiple depths.
Mark
Mark Hughes
Owner, Hughes Tooling
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