How to create a "shear" transformation in Fusion 360

[paulDQP25]

Hello,

I'm new to Fusion 360 and trying to find a way to shear a body.  I see that there isn't a shear command, but I imagine there is another way to do the same thing.  I just haven't figured it out yet.  We currently use Rhino 3D to model profiled rotary milling cutters, such as ones that would be used to make wood mouldings.   A simple example is shown below.  The profile requires clearance on 2 planes.  Our current workflow is to do a tapered extrusion of a planar curve. Then the resulting solid is "sheared" by an angle calculated to give the right relief angle on the cutting edge when combined with the taper angle from the previous operation.

It seems like I should be able to select the top plane and shift it an amount that would produce the right angle, but the tapered extrusion constrains the sides to 6 degrees, so the top face can be moved up or down, but not left-right or forward-backward.

Thanks for having a look.  Any suggestions are appreciated.

-Paul

[davebYYPCU]

Create a second sketch at plate thickness above the first.  Copy the original sketch articles to the new sketch, position / edit as desired.  Loft both sketches.

You may also get there with normal extrusion, and Draft command, or chamfer, 

Your request is not so clear.

Might help...

[paulDQP25]

Thanks for your suggestions Dave,

I'm going to pay around with the draft command and see if I can make that work.   Copying the base sketch to the height of the upper face and lofting wouldn't really work because the upper profile is not the same due to the tapered extrusion.    If there is away to extract the seams of the top face and make them a sketch, then I think lofting would give me the correct geometry.

Thanks again.

Paul

[davebYYPCU]

Sorry?

Loft will create a solid from the 2 different profiles. (Top sketch anything you create)

I take it that the plate could have 3 faces that are not cutting vertical, and a bevel is required on the cutting face

More like Draft to me, set an angle, effects just the faces selected

Might help.

[paulDQP25]

Thanks for the suggestions and to all who had a look at this. 

I haven't found a good solution yet, and starting to believe that there may not be an efficient way to accomplish this.  Drafting doesn't work with curved faces because it applies the draft angle in the normal direction  all along the contour.  If I can reduce this to an even simpler case and illustrate, I'll come back.  The only way I've found to get the correct geometry in Fusion 360 is to work with surfaces and lofting. After about about a dozen steps for a very simple profile, I can end up with the right shape.  This "shearing" transformation I've been trying to solve with Fusion 360 is a frequent part of our workflow, and takes a couple seconds to accomplish in other CAD drawing applications even with complex form tool profiles.    I design cutting tools and it is typical to have different clearance angles in the axial and radial directions.  Where there are tangent curves the different angles need to blend seamlessly.     

You might be thinking that I should just loft between two sketches, but the exact geometry of one sketch is not known.  It could be calculated but it has always bee much faster for me to generated the profile for the second plane by using a tapered extrusion and shearing.  Ultimately the two profiles become toolpaths for a 4-axis wire EDM program cutting carbide or HSS inserts.   I'm excited about using Fusion 360  for other operations like turning cutter bodies and various milling operations.   It just might not be the right design application for cutting tool edge geometry.  

Thank you again.

Paul

[g-andresen]

Hi,

is it that what your are looking for?

günther

günther

[paulDQP25]

Thank you Gunther,

That's the correct result.  I'd like to experiment with that on a more complex profile.  Did you use draft on the two straight elements only and then sweep the radius portion along an angled line?

Paul

[g-andresen]

Hi Paul,

here´s my way:

günther

[paulDQP25]

Hey Guenther,  Thanks so much. Your procedure definitely works on that profile.  I'm going to test some more complicated ones but I see no reason the same sequence can't be used.   I'm going to "accept" that answer (if I see the accept button again - this is the first time I've posted on this forum so not yet sure how it all works).

Thanks also to others who gave me good ideas and/or spent time thinking about this for me.

Paul

[g-andresen]

Hi Paul,

here is an alternative in creating the bevel:

günther