Three Deminsional Eight Pointed Srar
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- dusty
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Re: Three Deminsional Eight Pointed Srar
]Thanks for the challenge. Now that I can draw it maybe I can make it.
"Making Sawdust Safely"
Dusty
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Dusty
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- JPG
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Re: Three Deminsional Eight Pointed Srar
Ahhh - so it be a solid, not any of that other stuff?
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
Re: Three Deminsional Eight Pointed Srar
Impressive. I can't imagine how to go about making one.
BTW, a pyramid has four faces, but it isn't a "regular" tetrahedron, because its base is a square, not a triangle.
BTW, a pyramid has four faces, but it isn't a "regular" tetrahedron, because its base is a square, not a triangle.
Re: Three Deminsional Eight Pointed Srar
I know what you're trying to say. However, a pyramid with a square base is not any kind of tetrahedron because it has five sides, making it a pentahedron.
And it is extremely impressive work.
Ed from Rhode Island
510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
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1961 Goldie:1960 Sawsmith RAS:10ER
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1961 Goldie:1960 Sawsmith RAS:10ER
- dusty
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Re: Three Deminsional Eight Pointed Srar
It be a solid if you make it that way but that is not what I intended.
Whatever is wanted:
"Making Sawdust Safely"
Dusty
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Dusty
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- edflorence
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Re: Three Deminsional Eight Pointed Srar
Aha! Sometimes the old ways are the best ways! Thanks for the photo of your set up. Now I just have to figure out how to do the layout of those shapes... Very cool Moxon vise, by the way.
Ed
Idaho Panhandle
Mark 5 of various vintages, Mini with reversing motor, bs, dc3300, jointer, increaser, decreaser
Idaho Panhandle
Mark 5 of various vintages, Mini with reversing motor, bs, dc3300, jointer, increaser, decreaser
Re: Three Deminsional Eight Pointed Srar
Just to be clear a pyramid can have a square base, a triangular base, circular base or any other polygonal or otherwise shaped base. Triangular based pyramids are common, though I guess when I said I saw pyramids intersecting in the earlier picture, some may have assumed I meant a square based pyramid like an Egyptian pyramid as an example. That was NOT what I meant. FYI...a triangular based pyramid is ALSO known as a tetrahedron, but a tetrahedron is a special type of triangular based pyramid in which all edges are of equal length and all angles are equal, so it is a subset. IF Glenn's construction on this thread has equal angles and equal length edges (before merge of course), then it qualifies as a tetrahedron. Otherwise, it is the merging of two triangular based pyramids.
Last edited by RFGuy on Sat May 06, 2023 2:39 pm, edited 4 times in total.
RF Guy
Mark V 520 (Bought New '98) | 4" jointer | 6" beltsander | 12" planer | bandsaw | router table | speed reducer | univ. tool rest
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Mark V 520 (Bought New '98) | 4" jointer | 6" beltsander | 12" planer | bandsaw | router table | speed reducer | univ. tool rest
Porter Cable 12" Compound Miter Saw | Rikon 8" Low Speed Bench Grinder w/CBN wheels | Jessem Clear-Cut TS™ Stock Guides
Festool (Emerald): DF 500 Q | RO 150 FEQ | OF 1400 EQ | TS 55 REQ | CT 26 E
DC3300 | Shopvac w/ClearVue CV06 Mini Cyclone | JDS AirTech 2000 | Sundstrom PAPR | Dylos DC1100 Pro particulate monitor
- dusty
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Re: Three Deminsional Eight Pointed Srar
I'm running out of scrap wood (aka, cutoffs) trying to figure out how to cut one of these.
"Making Sawdust Safely"
Dusty
Sent from my Dell XPS using Firefox.
Dusty
Sent from my Dell XPS using Firefox.
Re: Three Deminsional Eight Pointed Srar
Re: Three Deminsional Eight Pointed Srar
I have half of one of these emerging from a block of pine. It's rough, I started with some unnecessary cuts, you can see that on the bottom corners. It's only material that would get removed later from other cuts, but it helped me solidify the concept in my head. Glenn provided enough hints on how to make this. If I make another one I'll take pix of each step. It's not that difficult, if I can work out the compound angles it should be workable on the bandsaw. If you do this with a handsaw make sure you have a good sharp one. Wish I had one right now. Some useful info about this shape: Glenn already pointed out that it can circumscribed by a cube. There's also a square formed by the points where the two tetrhedra intersect.
Ed from Rhode Island
510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
Super Sawsmith 2000:Scroll Saw w/Stand:Joint-Matic:Power Station:Power Stand:Bandsaw:Joiner:Jigsaw
1961 Goldie:1960 Sawsmith RAS:10ER
510 PowerPro Double Tilt:Greenie PowerPro Drill Press:500 Sanding Shorty w/Belt&Strip Sanders
Super Sawsmith 2000:Scroll Saw w/Stand:Joint-Matic:Power Station:Power Stand:Bandsaw:Joiner:Jigsaw
1961 Goldie:1960 Sawsmith RAS:10ER