Attached is an image with green lines I did in Photoshop that shows what
kind of Fillet I need but I don't know how to do.
Anyone here know how or got any ideas?
I'm stumped.
How to do a Fillet like this ?
Not clear exactly from your picture, but did you try the "Variable Radius" option in the Fillet dialog?
The fillet is going in the wrong direction. The start and end are reversed.
I need it to go the other way. From the sharp edge on the left to the curved edge on the right
How do you change that?
Several things:
1. The file you attached is probably an older version, there was no "Body18", but I think I figured it out.
2. I think you are thinking about the filet in the wrong direction. The rounded sketch profile (endneck) side already has a radius, so you do not need to apply a filet to that side. But still, because its a loft, Fusion 360 can behave weirdly.
3. The problem with the weird behavior gets solved if you create the loft as a separate body, instead of merging it with the rectangular neck behind it.
4. See attached. I edited the loft to be "New Body" instead of join (this created a Body18). Then played around with the filet on the lofted body until it looked right. Then set the filet/radius on the body behind it to match. Then you can combine the bodies back together.
one thing to keep in mind is that it's not general a god idea to use fillets like this. it is intended as a finishing tool, not a modeling tool.
a few thoughts on your model-
-why is the profile of the very first sketch (top) moved off it's sketch plane into 3d space? this is practice will probably give you grief down the road, and isn't a great idea.
-then there is this gem in the end neck sketch
that tangent constrain is pulling the end of that spline to be tangent with the vertical line. there is a microscopic bend there that is wrecking havoc on any surfacing tools you might be trying with that profile. here is the curvature map of a loft using that profile-
anyway, I said something about it not being a good idea to use fillet as a modeling tool. Of course now I'm going to turn around and use it as a modeling tool. I guess there are exceptions to every rule. I'm not sure what your envisioning for that transition, but here is a possibility. adding a fillet to the edge of the extruded block makes the transition to the curve of the neck go smoother. still not great, I would prefer to add some rails to either side of the fillet and smooth out the fade, but it's a start.
Why? Because I'm a noobie .
I checked out your file and that's pretty good.
Couple things tho...
There is a problem area where an edge didn't stay inline on the top of the Heel.
There are a bunch of purple lines in there and I don't really understand how you did that.
I get that you would use Loft and Rails but not how to get them in the right spots.
Also I am not able to move the curvature handles around to change the shape of the curves.
Here are some images I took of a real guitar neck I have
so you can better see the shapes.
@jda70az wrote:
Why? Because I'm a noobie .
check. There are of course perfectly good reasons why you might have a sketch off in 3d space, so I wanted to ask. rule of thumb. have a reason, or keep it 2d.
I checked out your file and that's pretty good.
Couple things tho...
There is a problem area where an edge didn't stay inline on the top of the Heel.
oops, got lazy. when combining flat straight sections with curves in a single loft you have to be careful with your rails. (well, gotta be careful any way, but extra careful). The attached has a few added, hopefully it's better.
There are a bunch of purple lines in there and I don't really understand how you did that.
I get that you would use Loft and Rails but not how to get them in the right spots.
the purple lines are projections. in this case fusion added them automatically when I added the rails. The rails are constrained to be tangent to the edges of the helper body I lofted in as a surface. (the body named "helper"). The procedure was
-to start a new sketch, select any plane (I selected the xz origin plane) for the sketch plane
-make sure 3d sketching was turned checked on
-draw a 2 point fit point spline between the vertexes
-apply a tangent coincident between the spline and each edge (this is the point where the purple line will appear. fusion does that automatically. don't care for it, but oh well)
Also I am not able to move the curvature handles around to change the shape of the curves.
once a curve is off the sketch plane and out in 3d space, it can only be manipulated with the move command. messing with 3d splines is quirky, requires patience. select a tangent line endpoint, right click, select move from the marking menu. since there is a tangent constraint it will only move along a line, but you can shorten and lengthen it.
Here are some images I took of a real guitar neck I have
so you can better see the shapes.
ahh yes, and the rest of the story.
so we need to step back and take a slightly different run at this if you want that well defined edge. the current approach won't get there with out some modification.
I have attached a simple file I did with just Sketches if you want to take a look?
As for your question about the real guitar neck heel ..well its edge has a slight bevel / chamfer to it.
Because it's been sanded with sand paper.
But I don't really need that per say in a CAD file. That would be something done by hand
after the machining process. So I wouldn't bother trying to model that.
Only reason I tried to model it was because I was having so much trouble trying to match up
the lofted parts and using Fillet I added that as a band-aid. Which didn't work out.
