can somebody check my thinking here please?

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Antenociti
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can somebody check my thinking here please?

Post by Antenociti »

brain isnt firing on all cylinders atm (heck ANY i think)

with ref to this thread: viewtopic.php?t=66054

i'm going to mke some of the small pods as shown on the models page here: http://www.iwarpapermodels.org/content/index.htm

http://209.85.50.70/~iwarpm/pics/models/pods.jpg
(yellow 'octagonal' thingies - or cubes with the corners cut-off as i call them)

i.m going to make a single face and then cast that up 6 times with each face being the same size.

I then just chamfer the rear edge of each piece at 45degrees and they will all slot together snug...won't they? (I dont need to alter any of the side pieces measurement)

i just then need to make the tri-angular bits, chamfer their edges again and they should sit in place perfectly.....?? :?
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Brandlin
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Post by Brandlin »

HI Jed - If you are making octagonal prisms, then you need to chamfer the edges of your side panels to 22.5 degrees, then they will mate into the correct 45 degree angle at the corner.

Octogons do strike me as daft though as they wont tesellate. Any shipping company is going to want to pack stuff in tight rather than ship loads of empty space. Hexagonal would be better , and rectangular best. (but maybe not as cool looking)

edit : just noticed you said you'd cast the side 6 times... so are you making hexagons or octogons.

If hexagons, then you need to chamfer the edges to 30 degrees.

The easy way to work this out is to divide 360 degrees by the number of faces, and then half it so that your corners mitre properly...

Hope some of that rambling helps...
Last edited by Brandlin on Sun Sep 21, 2008 5:29 pm, edited 1 time in total.
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Brandlin
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Post by Brandlin »

just had a doh! moment...

i see you mean the "cubes with the corners cut off"...

so, yes, 45 degrees, six faces and 8 small triangles....

:blush: sorry
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Antenociti
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Post by Antenociti »

Brandlin wrote:just had a doh! moment...

i see you mean the "cubes with the corners cut off"...

so, yes, 45 degrees, six faces and 8 small triangles....

:blush: sorry
hehe - see, that's what i was doing?! :oops:

might leave it till the morning lol
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Chacal
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Post by Chacal »

Where octagon meets octagon, yes, 45º is the ticket. Between triangles and octagons, however, the angle will be different. It will be 55.35º (trig is the modelbuilder's best friend)
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Post by Antenociti »

Chacal wrote:Where octagon meets octagon, yes, 45º is the ticket. Between triangles and octagons, however, the angle will be different. It will be 55.35º (trig is the modelbuilder's best friend)
thx chacal - that saved me one set of cockups at least :)
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