How do I create this geometry? I have tried all the arc options but I cant seem to get smooth edges.
Hello Justin,.. not sure what you mean by smooth?... tangent or contiguous?
Indeed, what Paul shows is a Fit Spline upon the arcs in the sketch.
Tangent is what I was referring to. The geometry I keep getting is really funky and looks more like several partial circles with sharp coincident angles. When I try to select the tangent option, I get over defined geometry.
Thanks for the solution. To be more specific, how do I know where to set the center of the arc in order to make the correct connection with another arc?
That will take care of itself.
End arcs are fully constrained (assuming on same vertical line from base arc center). Middle arc positions will be fully defined by radius and tangent.
1-9SFYI5Y wrote: Thanks for the solution. To be more specific, how do I know where to set the center of the arc in order to make the correct connection with another arc?
Simply use only the dimensions that are given.
The only centers that are specified are for the R3 and the R6 arcs.
The rest will all be dependent on you Tangent relations. (Geometry 101)
I strongly recommend that you Attach your *.sldprt file for help or ask your instructor to join this discussion.
use tangent constraints??
Tangent constraints will not be smooth, and create an edge when extruded. This is a use of Fit spline to remove them.
Paul has illustrated this.
Tom Gagnon wrote: Tangent constraints will not be smooth, and create an edge when extruded. This is a use of Fit spline to remove them.
Tom Gagnon wrote:
Are you sure about that? I thought that by definition there wouldn't be an edge if they're tangent. I will agree that there will be a line in the model if you have tangent edges set to show (I don't).
Yes. A tangent edge is still an edge. You can select it, and can apply edge functions upon it, including mates.
I had one component modeled all smooth, which I had to undo its fit spline so that I could have an edge (and maybe cylinder face) back to mate upon.
Edit: tangent edges are shown as phantom in this image. You can see one at its bottom where I broke its smooth appearance.
I guess it was the "will not be smooth" part of your statement I was disagreeing with.
I understand the semantics, so I'll be more specific. It will not be one single smooth face. It will be several tangent faces w/o fit spline.
I'd always go for geometric arcs, in my experience these tend be easier/smoother to machine on milling machines or CNC routers.
On some CNC controllers spline curves tend to be hard to cut as the radii is forever changing. this allows the dwell between each line of code to show in the finished surface. So by having as few tangent edges as possible will reduce the reduce the amount of these dwell points.
After messing around with arcs some more and deleting coincident relations and adding tangent relations, I figured it out. Thanks for the input everyone.
1-9SFYI5Y wrote: After messing around ....
After messing around ....
Rather than using a trial and error approach - you should pay attention to the geometry relations and develop predictable, robust modeling techniques.
SolidWorks Relations - Geometrically Solving Tangent Arc Centerpoints - YouTube
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