Login

Recent searches

No recent searches

Search options

Only available when logged in.
social.coop is one of the many independent Mastodon servers you can use to participate in the fediverse.
A Fediverse instance for people interested in cooperative and collective projects. If you are interested in joining our community, please apply at https://join.social.coop/registration-form.html.

Administered by:

Server stats:

489
active users

social.coop: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.4

#onshape

1 post1 participant0 posts today
Public
jcreed

Huh, making a custom servo horn wasn't all that hard! Just counted the teeth (21) from a photo, estimated the inner/outer diameter ratio (about 0.95), drew some curves by vibes, made one test fixture with OD values from 4.8mm to 5.2mm in steps of 0.05mm, and 5.0mm worked great. #onshape #cad

A servo with 3d-printed horn attachment and mount
CAD model of custom servo horn
Public *
jcreed

Ok, so I've realized belatedly that #onshape #cad does in fact support functional abstractions of parts over dimensions, which is neat.

You just gotta make a part, go into the "configurations" panel, "create a configuration variable", use that variable in your part, then in another part studio you can do a Derived feature referring to the first part, and then you get to specify a value for the "configuration variable", i.e. pass argument to the function.

Four cylinders, which are four different invocations ("derivations") of the same function ("part") inside a for loop ("linear pattern feature where a local variable is imperatively updated")
Continued thread
Public *
Aaron EB

We now have a pentagonal section of a dodecahedron with a sphere as its face. This can be propagated back to a full sphere with a combination of circular patterns on 3 and mirrors, your call. (1-4)

In onshape at least, you can union the whole thing back into a sphere without error since we've defined the faces NOT (believe me, I tried this way first) as fractional degree angle to angle measures but with stepwise precise operations.

I figured since I spent most of my morning figuring this out, I'd share the process with other folks and hopefully keep it somewhat software agnostic.

<3

#cad #onshape #design #polyhedra

[5/5, end]

Continued thread
Public *
Aaron EB

Perform an intersect boolean on both the revolves. this leaves a airfoil/kayak shaped piece, the edge away from the origin is one of the true edges of the (not yet spherical) dodecahedron. (1)

Create a three point construction plane on two vertices from the wedge and one vertex of the cube. This plane defines your first face. (2)

Draw a pentagon on that plane and stick it to the same points you used to create the plane. (3)

Create another plane on three points, this time for the two points of the wedge and the origin. This defines a midplane between two of the pentagonal faces. (4)

#CAD #onshape #polyhedra

[2/5]

Public *
Aaron EB

HOW TO: Projecting an accurate (i.e. no chance for floating point errors to stack up and ruin your day) dodecahedron onto a sphere in CAD. This is possible because a cube shares some vertices with a dodecahedron as explained in archive.bridgesmathart.org/200, img 1).

[NOTE: this took me 10x as long to figure out this process as I initially expected. The face to face angle way using arctan & fractional degree angles is -profoundly- cursed. There be dragons.]

Extrude a cube around the origin. (2)

On one square face, draw two pentagons so that the opposite edges of the square face match up with the longest vertices across a pentagon with the bulk of the pentagon sticking out into space. (3)

Separately, revolve (as "NEW" bodies) two of the larger trapezoidal sides of the pentagons on opposite sides of the square (4)

[1/5]

#cad#onshape#polyhedra
Public
Aaron EB

weird little CAD sketch constraint trick I like using occasionally: use equality-constrained circles to define ratios between two distances. 1:2 is shown here but others are possible.

I was trying here to make a single leg of a sinusoid before realizing that sweeps don't like (i.e. won't compute) on sharp corners. Might take a different tack.

I'd love to see a book/list/post of this style of geometric trick usable in a variety of cad software. Is there a software agnostic CAD/sketch-constraint design manual?

and yes, this isn't great design and would be hard to troubleshoot, I was mostly just seeing what I could with a single bezier with some nice symmetry.

a black on white sketch from a CAD program defining a curve. The main curve starts on the left and arcs up and over to the right with a pair of circles in the middle defining a 2:1 ratio between three points (A:B is 2:1 that of B:C)
similar to the first image but a bit taller-- the curve starts and ends at a 60 degree angle instead of a 45 degree angle.
#CAD#onshape
Public
Mᴀʀᴋ VᴀɴᴅᴇWᴇᴛᴛᴇʀɪɴɢ

I uploaded the tiny but functional monitor stand that I designed in #onshape to #thingiverse. Feel free to use it if it seems useful, or suggest improvements.

thingiverse.com/thing:6923657

ThingiverseStand for a travel screen portable monitor.. by brainwagonA couple months ago I bought a "Yodoit" portable travel monitor https://www.amazon.com/gp/product/B0C77WJ6F5 which is essentially just a laptop screen with the necessary HDMI + power cabling to act like a 15.6 monitor. It was cheap ($50) and I'm quite pleased with it, but it comes with a cover which is supposed to act like a stand, but which really didn't cut it for me when I wanted to set it up for more than the odd moment of casual use. It has VESA mounting screws on the back, which are 4 M4 x 10mm, so I went ahead and designed it with OnShape and printed this little bracket to hold it at a 15 degree angle. I printed it in PLA with "extra fast" settings, and even on my Elegoo Neptune 3 it took only a little over how to print. It could definitely be made more sturdy and less easy to tip, but I found it to be better than the conventional stand. If I get some time I may work on creating a version that folds down and has space to store the allen wrench and screws that I use to assemble it, but it might be useful even in its current state.
#3dprinting
Public
Tobi Weh · NDS

Moin #PhysikEdu,

ich habe endlich mein Isotopentafel-Puzzle fertig modelliert und gedruckt. Damit kann man die Isotope zusammenpuzzelnd und anschließend Zerfallsreihen ermitteln, wobei ein „Zerfallsrahmen“ auch nur auf die Isotope passt, die diesen Zerfall „können“.

- Makerworld: makerworld.com/en/models/99822 freue mich über Boost/Likes

- GitHub: github.com/tweh/Table-of-Isoto

Auf einem Schreibtisch liegen 3D-gedruckte Teile, die zusammen eine Isotopentafel ergeben. Die einzelnen isotope sind weiße oder schwarze Puzzleteile. Darauf liegen Rahmen mit Pfeilen, um Zerfallsreihen darzustellen. Ebenfalls im Bild sind verschiedene Schreibutensilien und mehr Dekoration.
Detailansicht aus dem vorherigen Bild für die Zerfallsreihe von po-206.
Detailansicht aus dem vorherigen Bild für die Zerfallsreihe von Pb-212.
#FediLZ#Physik#Atomphysik
Public *
jcreed

A thing that is not necessarily unambiguously positive, but which on balance I like about #onshape is that it forces you to make files public for free accounts... so kind of like the early web, I can learn a lot by paying attention to how other people solve problems.

Continued thread
Public
jcreed

this is because I think judging from forum posts I can safely conclude that #onshape 's notion of tangency constraints don't support intermittent contact, but in the mechanism I'm trying to think about, there's a cam follower with two faces such that the cam is always in contact with one face or the other, but not any single one for the entire time.

Continued thread
Public
JonnyJest

So, so close to being done... I've revised the bottom of the keyboard tray a couple times again. I realized the Z axis of my K1C is 250mm not 220mm, so I'm taking advantage of that extra space for the width of the tray.

I'm gonna step away from it for a bit, but I think I just want to fill in those back corners with more tray for better stability when in a lap... It just won't look as cool :S

#steamdeck
#3dprinting
#cyberdeck
#onshape

ExploreLive feeds
About