Hi Toby, Many thanks for a USEFUL video. In my case the application was not 3D but was very helpful in my application. I own a Hobie Pro Angler 14 Kayak. It used dodecahedron rails for mounting it accessories. I designed and made several different styles of adapters to mount other accessories, on my HAAS CNC machine, to adapt this shape from the Hobie Kayak rails allowing use of many other T Slot accessories to my Hobie Kayak. Most of my mounted items are done with a T Slot system. Being able to mate one system to another has proven to be VERY useful. I have made everything from a custom tail light bracket that mounts to the rear rail on the Hobie kayak to mounting brackets that allow me to mount my Anchor Wizard kayak anchoring system, GPS, tool rack and many other things to the Hobie rail system.🙂
Wow that's awesome and a great idea! Mounting lights and GPS would be so clutch for nigh time adventures on the river!! Great job and thanks for sharing!!
I assume that magic angle is not mathematically exact, but more like "close enough". How did the resulting body end up watertight? Is there some automatic merging or alignment of the points of those neighboring pentagons going on?
I think so - and this is an EXCELLENT observation @schm4704 😀 I was wondering that too - both in Onshape and in other 3D CAD packages I've seen this happen where when you do some kind of "knit", to combine surfaces together, there is a "tolerance zone" where if it's "close enough" they get "pulled" together. I know that's a lot of quotation marks, but I'm just going from experience here - I don't know the technical range that we need to be within, to get this merging to happen.
@@TooTallToby Thanks, that's what I thought. In polygon-based modelling, as in Blender, you often have issues with duplicate vertices on top of each other which need to be merged, so I think something like that is going on here.
@@TooTallToby yep, it's true. Start off by inscribing a cube [CU] within a dodecahedron [DO]--this can be done by first making an arbitrary selection of one of the DO's vertices. Notice that this vertex is the termination of three of the DO's edges, and that each edge could be seen as the "bottom" of two coinciding pentagonal faces. To construct a cube interior to the DO, take a V-1 line from your selected vertex across the face of each of the three coincident DO faces. (A "V-1" line is one that is co-planar to the face, and drawn between two vertices, where one vertex is skipped such that the line originates at one vertex and terminates at the vertex following the neighboring vertex. (making 5 consecutive lines like this within a pentagon yields a pentagram.)) Now you have three lines across three coincident faces of the DO, and they share a single vertex. You might notice that these new lines are each orthogonal with respect to the other two. You might also see that you have the corner of what will become the cube. To get there, draw more lines across more faces, starting from the vertex in which the previous lines terminated. You'll know which vertex to aim for next because you know you're building a cube, so just make sure each new line is orthogonal to the one before it, such that the faces of the cube are created. When you have the inscribed cube, take notice of a particular geometry: with one of CU's faces as the bottom plane, when joined with DO's coincident edges "above", you have a shape that looks like a little rooftop. There are six of these rooftops present, given the six faces of the cube. Now imagine an axis of rotation whereby each of the rooftops is swung around 180 degrees along one of the edges of its cubic bottom face. The resulting form is a cube, with all the little rooftops nested inside, fitting together perfectly..
@@alquranalkarim6312 Parametric CAD regenerates the feature tree "sequentially" so you need to make sure the information you need is "above" the current sketch you need to use it in. A common technique is to create a "layout" sketch at the top with all the information you need and then use it for multiple other sketches/features.
Hi Toby, I got a lowes utility knife i disassembled and can't figure out how to measure and create a drawing of this part, if i could mail you this part could you maybe create a utube or at lease give me a clue? Maybe even just send you a picture that i scanned on my printer?
I'm going to be modeling a bunch of parts this year over on my channel - some will be in youtube - and I'll try to work a utility knife into the roster. Great idea thanks! Is it a folding utility knife or a standard (blade slides in and out) one ?
My interest is the modeling of the complete disassemble of each part for bringing into assembly , i count 22 parts including blade. it's a IRWIN MODEL # IWHT10577. Also my main interest is how to measure out these parts especially the small arcs and radius
Hi Toby,
Many thanks for a USEFUL video.
In my case the application was not 3D but was very helpful in my application.
I own a Hobie Pro Angler 14 Kayak. It used dodecahedron rails for mounting it accessories.
I designed and made several different styles of adapters to mount other accessories, on my HAAS CNC machine, to adapt this shape from the Hobie Kayak rails allowing use of many other T Slot accessories to my Hobie Kayak. Most of my mounted items are done with a T Slot system. Being able to mate one system to another has proven to be VERY useful. I have made everything from a custom tail light bracket that mounts to the rear rail on the Hobie kayak to mounting brackets that allow me to mount my Anchor Wizard kayak anchoring system, GPS, tool rack and many other things to the Hobie rail system.🙂
Wow that's awesome and a great idea! Mounting lights and GPS would be so clutch for nigh time adventures on the river!! Great job and thanks for sharing!!
I assume that magic angle is not mathematically exact, but more like "close enough". How did the resulting body end up watertight? Is there some automatic merging or alignment of the points of those neighboring pentagons going on?
I think so - and this is an EXCELLENT observation @schm4704 😀
I was wondering that too - both in Onshape and in other 3D CAD packages I've seen this happen where when you do some kind of "knit", to combine surfaces together, there is a "tolerance zone" where if it's "close enough" they get "pulled" together. I know that's a lot of quotation marks, but I'm just going from experience here - I don't know the technical range that we need to be within, to get this merging to happen.
@@TooTallToby Thanks, that's what I thought. In polygon-based modelling, as in Blender, you often have issues with duplicate vertices on top of each other which need to be merged, so I think something like that is going on here.
Thanks a million, really nice tutorial, will use it in the future
Awww yeah! Glad this is helpful!
I design and build an micro sphere deliver system for road paint ......works great, thanks onshape, ....
Whoah! Nice!!
Great video Toby. I haven't had a reason to dive into surfaces yet, but I guess now is good a time as any.
Awww yeah Thanks Jamie!
Learned some cool stuff, thanks. I thought you were going to to do wireframe-esque one shown in the thumbnail, what would be involved in making that?
Thanks and glad this helped - Stay tuned! That one is coming soon!
Want your mind blown? The dodecahedron can be folded in on itself - with no interfering geometries - to become a cube..
Wait....what?????
@@TooTallToby yep, it's true. Start off by inscribing a cube [CU] within a dodecahedron [DO]--this can be done by first making an arbitrary selection of one of the DO's vertices. Notice that this vertex is the termination of three of the DO's edges, and that each edge could be seen as the "bottom" of two coinciding pentagonal faces.
To construct a cube interior to the DO, take a V-1 line from your selected vertex across the face of each of the three coincident DO faces. (A "V-1" line is one that is co-planar to the face, and drawn between two vertices, where one vertex is skipped such that the line originates at one vertex and terminates at the vertex following the neighboring vertex. (making 5 consecutive lines like this within a pentagon yields a pentagram.))
Now you have three lines across three coincident faces of the DO, and they share a single vertex. You might notice that these new lines are each orthogonal with respect to the other two. You might also see that you have the corner of what will become the cube. To get there, draw more lines across more faces, starting from the vertex in which the previous lines terminated. You'll know which vertex to aim for next because you know you're building a cube, so just make sure each new line is orthogonal to the one before it, such that the faces of the cube are created.
When you have the inscribed cube, take notice of a particular geometry: with one of CU's faces as the bottom plane, when joined with DO's coincident edges "above", you have a shape that looks like a little rooftop. There are six of these rooftops present, given the six faces of the cube. Now imagine an axis of rotation whereby each of the rooftops is swung around 180 degrees along one of the edges of its cubic bottom face. The resulting form is a cube, with all the little rooftops nested inside, fitting together perfectly..
Nice approach. Is it possible to make it without magic angle?
Thanks - I'm not sure - for me personally I always had to find that angle before I could get it to work. But there is probably a way 🙂
en.wikipedia.org/wiki/Table_of_polyhedron_dihedral_angles
WHOA!!@@kesor6 This is AWESOME!! Thanks so much for sharing!!
Totally, and I've found it beautiful. :)
ruclips.net/video/lqR2HiUYQrM/видео.htmlsi=pvI71uxI6n7pghiX
In Solidworks you have to create an axis for the circular pattern, right?
Hello, why when i edit the first sketch the other sketches hiding automatic?
There is any solution to make them visible
Drag the first sketch down in the tree -- the tree represents the chronology of how the model is being solved.
@@TooTallToby thank you, i tried it but i det error for the sketch
Enable the "final" button while editing the sketch.
@@airwick5083 yes , i tried it too it's show all other sketchs, but i cant select them like (dot, edges) , i can't take landmark from them.
@@alquranalkarim6312 Parametric CAD regenerates the feature tree "sequentially" so you need to make sure the information you need is "above" the current sketch you need to use it in. A common technique is to create a "layout" sketch at the top with all the information you need and then use it for multiple other sketches/features.
Hi Toby, I got a lowes utility knife i disassembled and can't figure out how to measure and create a drawing of this part, if i could mail you this part could you maybe create a utube or at lease give me a clue? Maybe even just send you a picture that i scanned on my printer?
I'm going to be modeling a bunch of parts this year over on my channel - some will be in youtube - and I'll try to work a utility knife into the roster. Great idea thanks! Is it a folding utility knife or a standard (blade slides in and out) one ?
Yes it's a folding utility knife with a plastic flip out two blade storage@@TooTallToby
My interest is the modeling of the complete disassemble of each part for bringing into assembly , i count 22 parts including blade. it's a IRWIN MODEL # IWHT10577. Also my main interest is how to measure out these parts especially the small arcs and radius
Love your videos! just learning as much as i can fit in this old grey matter
"Magic" 🪄 LOL - another great video Toby - buːliən is the word ;)
Thanks DebianDog! This was a fun one!