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Flat pattern of a sphere?

23 REPLIES 23
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Message 1 of 24
jmartzig
2419 Views, 23 Replies

Flat pattern of a sphere?

has anyone done this? i would expect the pattern to look like one of those world maps thats all laid out flat. -Joe
23 REPLIES 23
Message 2 of 24
Anonymous
in reply to: jmartzig

A joke right?


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
has
anyone done this? i would expect the pattern to look like one of those world
maps thats all laid out flat. -Joe
Message 3 of 24
jmartzig
in reply to: jmartzig

ha ha - no. i know it sounds pretty funny. but a customer of ours (a jeweler) is looking for ways to make a piece of jewelery cheaper. a way to do this (he thinks) would for us to be able to lay out a flat pattern of a sphere, and have it welded about all seams. i thought i could do it in halves, but that dog wasn't hunting either. i thought it may be un-producible in inventor. i could probably get close using regular ol' autocad, using a that flat pattern of the earth like i mentioned above. -Joe
Message 4 of 24
Anonymous
in reply to: jmartzig

The 'flat patterns' of the Earth you see on world maps are distorted, even the
funny shaped ones.

Duncan


"jmartzig" wrote in message
news:f19b332.1@WebX.maYIadrTaRb...
ha ha - no. i know it sounds pretty funny. but a customer of ours (a jeweler) is
looking for ways to make a piece of jewelery cheaper. a way to do this (he
thinks) would for us to be able to lay out a flat pattern of a sphere, and have
it welded about all seams. i thought i could do it in halves, but that dog
wasn't hunting either. i thought it may be un-producible in inventor. i could
probably get close using regular ol' autocad, using a that flat pattern of the
earth like i mentioned above. -Joe
Message 5 of 24
mcreeder
in reply to: jmartzig

I would have thought the only way to do it would be to make it out of sections, like a beach ball, but then it is not going to be a sphere, as it will just be made of flat sections
Message 6 of 24
Anonymous
in reply to: jmartzig

Ceiling fan chains are formed spheres, I
think. See if you can find out how they are done.

 

Matt

 
Message 7 of 24
jmartzig
in reply to: jmartzig

ceiling fan chains? you through me on that one matt. got a jpg link? -Joe
Message 8 of 24
Anonymous
in reply to: jmartzig

There madeby stretchng and compressing the material, like other pressed shapes.

Inv. Flat Pattern doesn't do distortion, only bends etc.

Duncan
ps. I'd like to see InvRx do a flat pattern of a Cortina MkIII bonnet.


"Matt Hendey" wrote in message
news:B02C86A616D73EB997C7B77A76033861@in.WebX.maYIadrTaRb...
Ceiling fan chains are formed spheres, I think. See if you can find out how they
are done.

Matt
Message 9 of 24
mcreeder
in reply to: jmartzig

Well its a case of producing blanks for the press tool. It could be worked out with inventor somewhere along the line. Maybe you should but in a request to Autodesk and see what they say. I think that if it was added, then it would be a module for IV Pro one day if at all.

Martin
Message 10 of 24
Anonymous
in reply to: jmartzig

Get somebody that spins metal.

Do  a search on metal spinning.

 

They can make 2 halves of a sphere that you can
weld together.

 
Message 11 of 24
mcreeder
in reply to: jmartzig

The flat pattern for a hemisphere is a circle. But to get the correct size needed u will need to speak to the experts. Spinning is a bit of a black art. Its a very old method of working metal, and requires lots of knowledge. You might find that they are unwilling to part with this knowledge, and would rather just have the model of the finished item and work it out for you.

Martin
Message 12 of 24
Anonymous
in reply to: jmartzig

Use a drawn part. One company I worked for had to make extinguishers
that were a sphere. We made 2 drawn halves and welded together. Just
draw the shape and let someone like Hudson Tool or Zero Manufacturing
draw the part and worry about how much material is required.


jmartzig wrote:
> has anyone done this? i would expect the pattern to look like one of
> those world maps thats all laid out flat. -Joe

--
Hal Gwin
Mechanical Designer
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Message 13 of 24
glabah
in reply to: jmartzig

We've had to have several parts spun for us. To make the inventor model we simply use a revolve of a profile. We then send the metal spinning company drawings of what we would like. It is up to them to make the result.

We've never had to make a spere, but we have had to make several types of circular fan venturi this way. It isn't that difficult to get this done in Aluminum, but getting a precious metal to do it in a very small size is probably a different story.
Message 14 of 24
Anonymous
in reply to: jmartzig

"Duncan Anderson" wrote
in message news:7B7DFF51E6AEFED227E38E77328698E5@in.WebX.maYIadrTaRb...
> There madeby stretchng and compressing the material, like other pressed
shapes.
>
> Inv. Flat Pattern doesn't do distortion, only bends etc.
>
> Duncan
> ps. I'd like to see InvRx do a flat pattern of a Cortina MkIII bonnet.


The Cortina would be easy - Nice and boxy... 😉

Rory
Message 15 of 24
rllthomas
in reply to: jmartzig

Maybe if they would stop using cheap material and go with GOLD (very ductile) the could make the part - LOL.
Message 16 of 24
Anonymous
in reply to: jmartzig

See ivCF "Segmented hemisphere".

===========================

"jmartzig" wrote in message
news:f19b332.-1@WebX.maYIadrTaRb...
> has anyone done this? i would expect the pattern to look like one of those
world maps thats all laid out flat. -Joe
>
Message 17 of 24
jmartzig
in reply to: jmartzig

"impressive luke" (jeff). that may just be the thing they are looking for. thanks. -Joe
Message 18 of 24
Anonymous
in reply to: jmartzig

In general, this is a difficult problem to solve. The best solutions to this
problem seem to come from ball manufacturers. Baseballs only use two pieces
of leather, although the resulting seam is pretty complicated. The ends wrap
around, so it would either take multiple forming operations or some
interesting tooling.

I have seen tip shapers for pool cues that looks like a hemisphere with a
large lip.
http://store5.yimg.com/I/welovepool-inc_1766_5035054
You could probably get tooling to stamp a shape like that and then trim the
edge.

No matter how you make it, you would need tooling to hold the pieces while
they are being soldered. Even so, it would be difficult to get a good seam.

I worked my way through college as a silversmith, and I thought that shapes
like spheres, etc., were available through the wholesale jewelry supply
houses.

Loren Jahraus
Autodesk Inventor Workflow Team

"jmartzig" wrote in message
news:f19b332.1@WebX.maYIadrTaRb...
> ha ha - no. i know it sounds pretty funny. but a customer of ours (a
jeweler) is looking for ways to make a piece of jewelery cheaper. a way to
do this (he thinks) would for us to be able to lay out a flat pattern of a
sphere, and have it welded about all seams. i thought i could do it in
halves, but that dog wasn't hunting either. i thought it may be
un-producible in inventor. i could probably get close using regular ol'
autocad, using a that flat pattern of the earth like i mentioned above. -Joe
Message 19 of 24
Anonymous
in reply to: jmartzig

Very Cool....!!


"Jeff Howard" wrote in message
news:A3813704443D7265CEC12505FED17B61@in.WebX.maYIadrTaRb...
> See ivCF "Segmented hemisphere".
>
> ===========================
>
> "jmartzig" wrote in message
> news:f19b332.-1@WebX.maYIadrTaRb...
> > has anyone done this? i would expect the pattern to look like one of
those
> world maps thats all laid out flat. -Joe
> >
>
>
Message 20 of 24
Anonymous
in reply to: jmartzig

How big does this sphere have to be? 
What is the material?

 

I have been involved in jewelry manufacturing for
over 25 years and can probably give you an idea of the available
approaches.

 

Roger

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