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General Science / Re: [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 27/01/2012 20:37:08 »4
General Science / Re: [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 12/01/2012 23:31:11 »Anyone need to drill an (almost) square hole ? ...Hi RD,
Thank you for the youtube link. That's a good application of the Reuleaux triangle.
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General Science / Re: [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 12/01/2012 15:56:29 »Cute...Hi CliffordK,
Did I say pentagram earlier when I meant pentagon?
Anyway...
Have you looked at the Rotary (Wankel) Engine?
The method you mentioned can be used to make both pentagrams and pentagons.
Thank you for the information about the Rotary (Wankel) Engine.
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General Science / Re: [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 10/01/2012 03:19:33 »7
General Science / [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 13/12/2011 22:30:25 »Have you tried making it with paper?Hi CliffordK,
I have made a paper pentagram like this one.
And your idea encouraged me to make a 3D pentagram knot.
As far as your circle, I assume the sizes of the circles are critical. A little different, and you might end up with more sides on your star.Yes, you are correct.
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General Science / [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 11/12/2011 17:30:36 »
Hi CliffordK,
Thank you for your good idea. It seems that I need a 3D software tool for making a pentagram knot.
Merry christmas and happy new year 2012!
benice
Thank you for your good idea. It seems that I need a 3D software tool for making a pentagram knot.
Merry christmas and happy new year 2012!
benice
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General Science / [Dynamic Spirograph] Circle Rolling around Rolling Circle
« on: 11/12/2011 07:40:57 »10
General Science / Re: [Funny Math Art] Guess what's inside? (answers included)
« on: 06/02/2011 21:05:10 »
Hint:
Consider the intersection of a horizontal plane with the surface.
The intersection consists of a family of funny curves.
(An example curve is shown below. It has nothing to do with the answer.)
Cut off the upper surface above the horizontal plane to get a funny 3D image.
(This curve is obtained from another surface.)
Consider the intersection of a horizontal plane with the surface.
The intersection consists of a family of funny curves.
(An example curve is shown below. It has nothing to do with the answer.)
Cut off the upper surface above the horizontal plane to get a funny 3D image.
(This curve is obtained from another surface.)
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General Science / [Funny Math Art] Guess what's inside? (answers included)
« on: 04/02/2011 19:03:15 »The surface in above image is a portion of the graph of
some mathematical equation.
Let's do some brainstorming:
Can you guess what's inside the surface?
Answers:
A funny 3D image:
A funny curve:
The above graphics were created completely using math formulas and math softwares.
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