I'm trying to design a nose cone for a project boat that I am doing, and was wondering what the best way would be to design this cone?
Something that looks like this:
It's a 25" diameter at the bottom, 48" long from floor to tip and the radius of the knife edge is obviously compound.
I'm just trying to figure out the best way to model something like this so I can get a sheet layout off of it.
Thanks in advance!
Hi
I have had the same problem try using a lofted boss /base and finish with a swept boss/base think that how I got around it.
hope this helps
Regards
Paul
Paul,
You had trouble while doing surfacing or solid?
solid
Can you post the part which you had trouble with?
Please download the 3d model from Tony Cantrell
it's excellent demo about the loft feature you guys mentioned here
Can't see clearly from your image, How about this?
Looks close, but the issue is that it's not cylindrical all the way. It's only a cylinder at the extreme bottom in this image (25" diameter.)
From this point up to the tip it becomes a teardrop shape because the edge that's in the water is more of a knife edge.
Better image for description:
It seems to me that if you were to take that point at the tip and bring a line to the 90 and 180 degree points at the side of the diameter at the bottom then everything above that point (top of the tube) should be a nice even arc, while everything below should be straight.
I'm just having a hard time trying to decide how to MODEL that in solidworks.
My plan was to get a stencil of this shape as a layout for sheet work, cut them on my plasma table, and then form them myself.
Check this out
..yep... it has a tear sect ..
Ah, my bad. Now that I got it to open I can see that.
That's the basic shape that I am going for right there.
That's the shape I'd need to get a flat layout in DXF of real size.
It would be rolled in a plate roll and then the circumference end tacked, then the knife edge is pinch formed.
I've done it before at places I worked that made them, but I didn't have a layout. The parts came to me to weld up. (I'm a welder/machinist by trade.)
Jamal,.. yeah, if you have access to the actual cone, (as you probably know).. as a reference template, you can tape a large sheet of paper on the outside trim it at the base spine,.. that should give you something at least? (I update ( - b) the above file with another side guide curve to get a smoother/sharper transition)..
..btw,.. I did a Squish in Rhino3D for the flatten.. it's close but not exact (as with most non-developed flatten interpolations)..
Paul, Youdaman !!!
Here's one way
Here is my version. Solidworks. 2015 SP5
Tom
Tom,.. NICE!... "sketch2" is very forgiving by messing around with the bow length,.. the surfaces blend the surface very well!
Can't open. I have 2014, so I'm assuming it's a compatibilty issue.
Backwards compatability is a right pain I made a bit of a mess but really enjoyed having a go at modelling it, if you were to attach a part in 2014 with sketches showing your exact requirements on the standard views we could all open it.
Id be interested to see how close I could squeeze my sketches to what you want
Jamal that's a nice project you got going there.
I downloaded all those models and had a look, sweet work.
I tried getting a flat pattern out using face curves and lofted bends
but that gave me 10 flat patterns that either crashed Solidworks or didnt work at all!!!
So I just converted entities on the face of each flat pattern and pasted into a new part.
Best I could do was this Swiss Cheese Plant
edit: Sketch 14's got an unwanted vertical rel needs deleting
is this more the shape you want?
Jamal, hard to tell, but it looks like this figure has circular cross sections throughout?
I would probably sketch a side profile first, then do several perpendicular circular sketches (you will probably need to create several reference planes) that represent the cross sections at different spots, with the final cross section being just a point. You can then use a loft feature to join these together.
If there is a remaining cylindrical portion, just use an extrude or revolve for that.