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andy Member Posts: 17 ✭✭
Hi, Apologies if I have missed something simple, but I haven't seen a loft feature. A search of the help files didn't find anything and likewise couldn't find anything in the forum about it.
If its not there already I'm sure it must be in the works. Any timeframe for this?
JonnyJ Member Posts: 1 ✭Just realized there is no loft feature. Hopefully that changes soon. As it is, I can't use this program for design. Looking forward to updates.6
And here is a shoe sole that used alot of trimmed surface extrudes to give complex 3D curves to loft between.
That one I made using box modeling and subdivision surfaces in Blender.
Constructing an outline like this in Onshape is easy enough as is, but the cross-section of the wings is what I haven't been able to create yet. As far as I understand, in parametric CAD one could either use a loft between the top and bottom outlines, or sweep various kind of edge profiles around the perimeter.
One of the hardest things to loft is the bow of a sailboat.
(Lofting by conventional means is almost impossible, unless you're dealing with a cutoff bow, like an Optimist dinghy)
Here's another challenging shape, also to do with boats (The underside, which we cannot see, is significantly shaped in a way which is difficult to model, and the side flukes are twisted in a way which is not evident here, and difficult even to measure):
Creo has a feature called a Variable Section Sweep, and goes something like this:
1. Create a starting cross section.
2. Create guide curves which pierce the initial cross section.
3. Create the ending cross section, and any other intermediary cross sections, which also pierce through the guide curves.
4. Create the VSS feature, by referencing the sketches.
It's hard to explain, but it is more powerful than SW's loft with guide curves or sweep with guide curves. In addition, you can use it with the "trajpar" (trajectory parameter) command which is extremely powerful, and allows for the cross section to change driven by an equation. An example of this is when you want to create a braided wire through a 3D trajectory. In SW, you need to create swept surfaces (with z rotation), then sweep through the curves. In Creo, it is all in one single feature.
Just like all things Creo, however, it is anything but intuitive to learn how to do. Here is an example of the geometry:
This was one of the most underutilised features of the Solidworks Sweep command, because in addition to allowing a sweep section (such as a bunch of wires) to twist along curved paths, when applied to a straight path it was a much easier way of modelling springs and screw threads than the rather laborious Helix-based method. It could be further improved (especially in the screw thread case) by including a "Pitch" option for driving the rate of twist.
I would like to have any system to act like spinning router to create grooves and shapes. It's frustrating to create dozens of planes and revolves to replicate spinning router grooving the top of panel with different depths. And to make it even better, act like 5-ax router where router shape grooves in different angles.
They call it a "Solid sweep"; I presume it produces a number of solids along the sweep path, then produces a smooth solid through their silhouettes, then boolean subtracts that solid from the target.
BTW - @3dcad: all sweeps are lofts. Sweep is a way of automating the production of a loft for the special case where all the loft sections (profiles) share the same character. The process of allocating loft planes and placing sections on them happens "behind the curtains", although some packages allow you to preview these, to help with troubleshooting if the section cannot be produced at some point along the path, or if successive sections intersect with each other because the path curves too tightly.
But Solidworks certainly had problems respecting edge tangency accurately for lofts with guide curves, at least it used to. And I think that's why most users switched so enthusiastically to boundary surfaces...
Lofting from 1 profile to another, circle to square, oval to hexagon etc.
Eva Mechanica Ltd
This example I loft cut my part to go from an oval that mounts to an cylinder head, to a circle that is the internal profile of individual throttle bodies.
Eva Mechanica Ltd
I know much more now than I did then and could make it much better, but I still like it.
Eva Mechanica Ltd
SolidWorks? Looks like SolidEdge.
Whatever. Lofts or Bending from circular to rectangular would be necessary for my work. hopefully this will be possible soon with OnShape.
I leased Solidedge for 3 months, but found it too resource hungry on my computer vs Solidworks, but I wanted to lease my software rather than buy a license as I am a contractor.
I bit the bullet bought Solidworks 6 months ago, and my contracting has taken me into CNC/CAM programming and Teaching so I haven't touched it since....
Its a shame OnShape wasnt 7 months earlier
Eva Mechanica Ltd
Other paths I was struggling to recreate in Onshape were a v-groove path and a flat end tool with a 45° sloping lead-out.