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Author Topic: 3-axes slanted notches  (Read 3134 times)
rolly_wood
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« Reply #75 on: August 20, 2009, 03:53:10 AM »

.. at the first sight values of angle remain the same but either change the order of wedges or the sign of the angle (which means rotation of wedge) .... or both. I must think about it...
Often the answer is simpler than one would expect. It seems it is enough to take the "mirror" jig  Grin

PS sorry for mirror "numbers": this sketch is even worse now!


* horrible drawing mirror.gif (9 KB, 700x928 - viewed 37 times.)
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rolly_wood
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« Reply #76 on: August 20, 2009, 06:57:59 AM »

last post, sorry to annoy those who are not interested...
You noticed that angles are rather narrow... (not so many degrees). In this case one can assume the three angles as independent each other and try to guess their values...
From the figure it is evident that 1+2+90 degrees must be 108, the internal angle of the pentangle, and the same for 3+90 ... then 3 = 1+2 = 18 degrees.
Furthermore if one start from a piece and construct the pentangle, considering just the 'twist' applied to the following piece, (angle 1), it can be concluded that 5 twist operations must give 90 because the last piece is rotated like that. Then the first guess is angle 1=18. Since in this case 1 and 3 (which are the wider) combine together more than the previous case, this estimate is the weakest.

Then, without any computer or math tool, one could infer that angle 3 = 18 degrees, angle 1 + angle 2 = 18 degrees as well and that angle 2 is much smaller than angle 1.
I would bet that if I used 15,3,18 or even 11,7,18 puzzle got assembled as well...
But, in that case, you had not spent so many kind words at me and .... that's why  I chose the complicate way  Grin

PS kidding... but at the end, when things look a bit clearer, one often recognizes that there were shortcuts...  Wink


* thumb.jpg (15.04 KB, 476x373 - viewed 32 times.)
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Chinnomotto
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« Reply #77 on: August 20, 2009, 08:51:38 AM »

Very, very impressive Rolly, and you say I talk funny, I will have to read this 10 times

And I will give 007 a race to see who makes it first, 1, 2 ,3,,,,,,, OK you win

I assume all the sticks are same, so what size is your square sticks

Once I have finish our top secret project, i will work on this ,

Thanks for sharing
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I Have Such Sights To Show You

Chinny from  Sydney, Japan
rolly_wood
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« Reply #78 on: August 20, 2009, 03:40:24 PM »

Yes pieces are all identical, size is about 8x8x70 mm look back in the topic.
I've just sent you a sketch: your method is definitely better than my previous 'how-to-cut' proposal...  Wink
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rolly_wood
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« Reply #79 on: August 23, 2009, 06:47:34 PM »

just to help restarting discussion, not about this, in general.
Trying to find out the optimal colours pattern (within the available woods), this is: guatambu', doussie' padouk, wenge', jatoba' ...
I would subsitute the latter with an homogenous-grain wood like holly in a way to have the spectrum white, yellow, orange, red, black...
I removed brown wood that I initially chose (cabreuva). I would exclude purple-like woods (amarant, bubinga)...
 Wink



* Dscf5721.jpg (45.63 KB, 992x1032 - viewed 41 times.)
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