hi all
i am trying to design a golf ball as part of my engg project.
aim is to divide a sphere into icosahedron to make that possible.
but i am getting a projection like screenshot (attached), and that is expected also.
so how to get a proper division? i need like this image
http://www.grandunification.com/jpgs/PlatonicSpheres/Icosahedral.jpg
planar projections wont get you what you are looking for - you would need radial projections, which are not directly a feature in SW. here is one way to get around that.
Thank you Jeremy. Every time I think I'm getting the hang of this someone like you comes around. Guess that's what makes this so much fun.
hi dennis, were you able to open the sldprt file which is there inside zip? i am trying to open and getting an error encountered while trying to open. i am using solidworks 2014 btw. is that file made in solidworks 2015? can you please make same in 2014 and upload?
hey thanks for reply
i am trying to open and getting an error encountered while trying to open. i am using solidworks 2014 btw. is that file made in solidworks 2015? can you please make same in 2014 and upload? or maybe just give me a screenshot with all features expanded
Thanks Deepak, I was just getting around to working on this (modeling in 2014) but you beat me to it. Pratham, I know you will have fun with this. It is much simpler than I thought it might be. I don't quite understand what Jeremy did with sketch1. Interesting to say the least. I did find a equation that will give me the width of that rectangle. r is the radius of the sphere and a is the edge length. I solved for the edge length to verify what Jeremy did.
jeremy can you please explain how the last 3d sketch was made? i tried to understand but couldnt.
arcs have been used, but how?! please tell
I just mage the ends of the arcs coincident with the vertices and the centers of the arcs coincident with the origin.
I also had some difficulty with the last 3d sketch. There may have been some inference issues going on. I suppose I could have turned off "automatic references". I ended up placing the 3d arc in space then attached the end points and center point. That worked.
I will have to do some research on the "golden rectangle". So far I see it has been around since the beginning of time. Thanks for the tip.
dennis can you elaborate on procedure you are taking?
i made the whole icosahedron in one go in 3d sketch.
but then i couldnt loft the surfaces by choosing each of the lines and the centre of icosahedron.
so i built whole thing again by project curve using 2d, and finally made icosahedron using lofted surfaces.
i am sure there must be an easier way
Does this help? Make sure "Close loft" is not checked. Only pick the one line and the origin for each surface loft. It does take some time since there are a bunch of lofts required. Looks like 31 total. The diameter of the ball and the and the extent of the surface lofts can be easily changed for any size you would like. The lofts must extend beyond the ball in order to create the split lines.
yes i finally got it!!
thanks
my aim is to make golf ball with dimples and then do drag test.
i will surely bug you with further problems ok
reading out all the different dimple pattern related patents is such a mess though, because the dimples in most patterns are random in size and placement
the rectangle in sketch1 is a "golden rectangle"
Jeremy pretty clearly has a more elegant answer. But if you wanted to project a platonic solid onto an arbitrary shape, you could do this:
Draw 3d Sketch the solid
Surface loft the edges to the origin
Place the solid to be projected on inside
Split the solid using the lofted surfaces.
Knit to taste
i found one way to make that, that is by making planes inside 3d sketch, and then joining different points by using arcs. lengthy process it was.wish you would have posted solution one hour back
your way is superb! thanks!
well, i tried to make things using your way, i made icosahedron in 3d sketch, but then cant make solid out of it.
can you just tell how you made the solid?
I think what Mike did was to make lofted surfaces from edge to vertex (origin) all around then placed (or created) a solid sphere centered on the origin. Then used split line by selecting all the surfaces (at once). Then hide the surface lofts.. Works for me. I think you may be having too much fun.
Correct. I actually made the sphere a surface because I had planned to do an intersection curve (hence the knitting). But I wound up just splitting it, so it could/should have been a solid.
One advantage of doing it with a surface is that you can knit it into a single solid body with multiple faces, rather than leaving yourself with multiple solid bodies.
Jeremy pretty clearly has a more elegant answer. But if you wanted to project a platonic solid onto an arbitrary shape, you could do this:
Draw 3d Sketch the solid
Surface loft the edges to the origin
Place the solid to be projected on inside
Split the solid using the lofted surfaces.
Knit to taste