Machining a Segment of a sphere
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- Vectric Wizard
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Machining a Segment of a sphere
Hi Everybody,
I wish to make a sphere, say about 6 inches in diameter.... the actual size is not really important.
I would like to construct it from segments, like an orange, of different coloured hardwoods.
I have a few ideas myself but would like to draw upon the expertise of some of our more experienced workers.
Thanks in anticipation.
Soapy
I wish to make a sphere, say about 6 inches in diameter.... the actual size is not really important.
I would like to construct it from segments, like an orange, of different coloured hardwoods.
I have a few ideas myself but would like to draw upon the expertise of some of our more experienced workers.
Thanks in anticipation.
Soapy
- adze_cnc
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Re: Machining a Segment of a sphere
- Machine two halves and glue them together?
- Use a lathe?
- Use a circular saw (search for Izzy Swan's video)?
- Machine six shallow domes and glue them to a cube core?
- Get a six-axis machine?
How about using a bandsaw to form tapered blanks then place them in a jig and use the CNC to round them over?
- Leo
- Vectric Wizard
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Re: Machining a Segment of a sphere
Like slices of an orange
Each slice a different wood.
Hmmmmm
First a cylinder of slices.
thin double sided tape the slices to make the cylinder
Second - a rotary axis turning to make the sphere.
Each slice a different wood.
Hmmmmm
First a cylinder of slices.
thin double sided tape the slices to make the cylinder
Second - a rotary axis turning to make the sphere.
Imagine the Possibilities of a Creative mind, combined with the functionality of CNC
- mezalick
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Re: Machining a Segment of a sphere
I'm thinking he's looking for something like this..
Given that it's in the V-Carve section....now if it was Aspire....a whole different story..
Michael
Given that it's in the V-Carve section....now if it was Aspire....a whole different story..
Michael
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- mezalick
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Re: Machining a Segment of a sphere
I found an easier way using the molding toolpath option..
Michael
Michael
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Re: Machining a Segment of a sphere
In fact, if you lay it out correctly you should get 2 slices from the same block of material..
Okay,,I'll stop now.....LOL
Michael
Okay,,I'll stop now.....LOL
Michael
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- FixitMike
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Re: Machining a Segment of a sphere
Post the file. Please? I possibly could figure out how to do this myself, but I'm lazy.mezalick wrote:In fact, if you lay it out correctly you should get 2 slices from the same block of material..
Okay,,I'll stop now.....LOL
Michael
Mike
Good judgement comes from experience.
Experience comes from bad judgement.
Experience comes from bad judgement.
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- Vectric Wizard
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Re: Machining a Segment of a sphere
Hi Everybody,
Yes, I wish to machine it with Aspire 9.
My idea is to make the sphere from many segments ....say 36 each with a 10 degree taper.
I was thinking of using 2 rail sweep.
Any other ideas would be appreciated.
Soapy
Yes, I wish to machine it with Aspire 9.
My idea is to make the sphere from many segments ....say 36 each with a 10 degree taper.
I was thinking of using 2 rail sweep.
Any other ideas would be appreciated.
Soapy
- mezalick
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Re: Machining a Segment of a sphere
The two rail sweep would be my first choice...just need to make sure all the mathematics add up..
Michael
Michael
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- Vectric Wizard
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Re: Machining a Segment of a sphere
It fairly easy to make 10 degree wedges. Both the moulding and fluting toolpaths could be used for that. There are even a couple of 3D toolpaths that could do that job. What has proven difficult for me to do is make those wedges with a perimeter that is a true 10 degree section/slice of a sphere skin.
It seems as though there should be a mathematical/logical way to subtract 170 degrees from a half sphere and be left with a 10 degree slice of that sphere as a component to carve.
It seems as though there should be a mathematical/logical way to subtract 170 degrees from a half sphere and be left with a 10 degree slice of that sphere as a component to carve.
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- Vectric Wizard
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Re: Machining a Segment of a sphere
Thank you for your interest in my posting.
I am not quite sure that I fully understand exactly what you mean by.....[wedges with a perimeter that is a true 10 degree section/slice of a sphere skin].
Do you mean that the wedges will have a flat on them ?
Soapy
I am not quite sure that I fully understand exactly what you mean by.....[wedges with a perimeter that is a true 10 degree section/slice of a sphere skin].
Do you mean that the wedges will have a flat on them ?
Soapy
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- Vectric Wizard
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Re: Machining a Segment of a sphere
If you want the 10 degree slices of a sphere to just be glued together without needing to be lathe turned/trimmed and sanded down until they look like a smooth sphere then the CNC could do that, if only you/I/anyone was smart enough to know how to make that 3D model for cutting out. If you just want 10 degree slices that are rectangular and can be glued up into a cylinder, then lathe turned down into a sphere then that is easy to do using the Moulding toolpath or the fluting toolpath and an array of parallel lines.Soapyjoe wrote:I am not quite sure that I fully understand exactly what you mean by.....[wedges with a perimeter that is a true 10 degree section/slice of a sphere skin].
Do you mean that the wedges will have a flat on them ? Soapy
If my explanation is still confusing I apologize. I am used to talking to college students who go blank when I'm trying to explain how we'll cut their creative creations out using a CNC.
4D
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- Vectric Craftsman
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Re: Machining a Segment of a sphere
Lots of good ideas in this thread but there is no need to create a process - -someone else already did all the hard work for us.
http://forum.vectric.com/viewtopic.php?f=29&t=18525
This post shows:
Perfect 4" sphere on a 3-axis Joe's Hybrid machine.
Board thickness needs to be about 25% of ball diameter.
1/4" RN to ruff; 1/8" RN finish. White pine.
---------------------------
I believe this will achieve your goal.
http://forum.vectric.com/viewtopic.php?f=29&t=18525
This post shows:
Perfect 4" sphere on a 3-axis Joe's Hybrid machine.
Board thickness needs to be about 25% of ball diameter.
1/4" RN to ruff; 1/8" RN finish. White pine.
---------------------------
I believe this will achieve your goal.
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- Vectric Wizard
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- Joined: Sun Sep 23, 2012 12:14 pm
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Re: Machining a Segment of a sphere
His goal was to create the sphere using 10 degree slices.Pete Cyr wrote:Lots of good ideas in this thread but there is no need to create a process - -someone else already did all the hard work for us.
http://forum.vectric.com/viewtopic.php?f=29&t=18525
Soapy wrote:"My idea is to make the sphere from many segments ....say 36 each with a 10 degree taper.
- Leo
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Re: Machining a Segment of a sphere
Here is a 10 degree slice from a sphere.
Done with a 2 rail sweep.
The outside radius is 3" and the spherical curve is 3" radius.
Because the sides are almost vertical it is going to be really difficult to machine
This is a toolpath preview
Material size is 7" x 4" x .6"
Tool used is 1/32 tapered ball nose - stepover is .003
I don't think there will be good definition on the spherical cut otherwise
Done with a 2 rail sweep.
The outside radius is 3" and the spherical curve is 3" radius.
Because the sides are almost vertical it is going to be really difficult to machine
This is a toolpath preview
Material size is 7" x 4" x .6"
Tool used is 1/32 tapered ball nose - stepover is .003
I don't think there will be good definition on the spherical cut otherwise
Imagine the Possibilities of a Creative mind, combined with the functionality of CNC