FreeCAD

arhi

difference between sketches and drafts

AFAIK just a philosophy nothing else. I kinda always use sketch and never draft so I might be wrong but they say:

https://wiki.freecadweb.org/Sketcher Workbench

Traditional Drafting

The traditional way of CAD drafting inherits from the old drawing board. Orthogonal (2D) views are drawn manually and intended for producing technical drawings (also known as blueprints). Objects are drawn precisely to the intended size or dimension. If you want to draw an horizontal line 100mm in length starting at (0,0), you activate the line tool, either click on the screen or input the (0,0) coordinates for the first point, then make a second click or input the second point coordinates at (100,0). Or you will draw your line without regard to its position, and move it afterwards. When you've finished drawing your geometries, you add dimensions to them.

Constraint Sketching

The Sketcher moves away from this logic. Objects do not need to be drawn exactly as you intend to, because they will be defined later on by constraints. Objects can be drawn loosely, and as long as they are unconstrained, can be modified. They are in effect "floating" and can be moved, stretched, rotated, scaled, and so on. This gives great flexibility in the design process.

Kolbi

@oliof said in FreeCAD:

JoKo Engineering FreeCAD tutorial

Thanks @oliof, those tutorials will be helpful - I just opened FreeCad and realized it is much different then what I'm used to.

Link to the tutorials referenced: https://youtu.be/gbNg3mzm84s

oliof

Even though I never was able to do stuff in Fusion360, this video also was pretty good IMO: https://youtu.be/_GxJkB23ZHM

oliof

Here is a list of UI changes an acquaintance did to make FreeCAD less dated: https://pastebin.com/SkszvjqS

I only installed the glass UI and switched to a dark theme, which already made a huge difference to me.

droftarts

What is the mechanism for updating the latest 0.19-pre release from November 2019? It looks to me that it happens semi-automatically on Windows and Linux. But it looks like you have to compile on Mac? I looked at the compilation instructions on Mac, and they are out of date; make and homebrew don’t work, and looks like it’s currently compiled with Conda. There’s a thread with some detail here: https://forum.freecadweb.org/viewtopic.php?f=4&t=49769

native OS X build environment is kind of a trashfire.
(https://forum.freecadweb.org/viewtopic.php?f=4&t=49769&start=20#p431784)

... would seem to be the case!

Ian

arhi

@droftarts 0.19_pre looks like it's being compiled daily for macos too .. the release placeholder is old but windows, linux and macos binaries in assets are 22492, that's "current"

droftarts

@arhi ah, now I understand! Thanks! Not going to bother with the hassle of compiling, just get on and try it...

Ian

arhi

@droftarts yes, I too seen that 0.19 pre release was put there year ago and assumed assests are same but looks like they just made system to replace assets every day (or every few days) so the install images are recent hence no need to compile unless you wanna modify the code.. and tbh compilation takes time 12 core ryzen9 with super fast m2 ssd's and 128g of super fast ram and it takes a loooong time to compile (I prepare and eat lunch and it's not done)

oliof

@arhi some people say the realthunder fork is a better UX than FreeCAD with some modules, but I don't have a machine to compile it and it does not come with binaries ... but you should get by with your Ryzen box.

oliof

Also, the Mechatronic Workbench looks like it could be useful for people building 3d printers and similar machines.

arhi

@oliof I don't mind UX in the freeCAD, took a day to figure out the basics and so far so good ... as for the mechatronic - noticed, installed, didn't try it .. I see there is really a lot of wb's available, had no time to try them all

droftarts

Had a brief play around with FreeCAD last night, and was pleasantly surprised! Last version I tried was 0.16, 2 or 3 years ago, and couldn’t get on with it. Used the video @oliof linked. One other change to the UI I made was to change input method from ‘OpenInventor’ to ‘CAD’, as otherwise you have to use a modifier key to place a point.

Mostly moving from Fusion to FreeCAD feels like moving from Adobe Illustrator to Inkscape; a bit clunky and not as polished, but quickly useable, and with more familiarity, should do everything I need.

Ian

oliof

For beginners, this short series of intro tutorials by DrVax could be useful

zapta

@droftarts said in FreeCAD:

I tried was 0.16, 2 or 3 years ago, and couldn’t get on with it.

The recent Fusion license changes gave FreeCad a lot of visibility (I see in other forums as well), which will most likely be translated to a critical mass and increased development velocity.

JoergS5

@zapta I tried Freecad 2 years ago and abandoned due to instability. It would be great news if Freecad is better now and gets momentum.

arhi

@JoergS5 just the difference 6 months ago and today is huge and compared to last year release it's huuuuge improvement... IMHO it moved from "I cannot use this no matter how much I want to" to "I can use this, it's not ideal, polished, perfect... but it is very usable"

JoergS5

@arhi I saw it's implemented with C++, so it should be possible to change code if necessary by some of us. I'll give FreeCAD a try again.

droftarts

Off topic, but relevant and not sure where else to post it: AutoDesk announces that STEP export will remain in Fusion 360 personal licence: https://www.autodesk.com/products/fusion-360/blog/changes-to-fusion-360-for-personal-use/

However, now I’ve started using FreeCAD I’m going to persist; I like having my documents on my machine, and I realise the cloud part of F360 always bothered me. And AutoDesk could always change their mind again!

Ian

zapta

@droftarts, thanks for the update.

Yesterday I spent a hour or two downloading STEP and STL files of my Fusion 360, as I saw it the main problem with the new license model.

However, it clicked with me that I need to move to something more stable than a free Autodesk and FreeCad seems to be a good choice, especially now that it's gaining momentum.

They also have a donation page https://liberapay.com/FreeCAD/income/

jens55

I decided to give FreeCad another shot as well but was stopped in my tracks when I tried to work on an object from thingiverse and edit it.
I used this method:

You can convert a mesh to a solid model that FreeCAD can work with with a few easy steps:

Note: an object needs to be selected before starting the command. Starting from step 2 you need to select the last object in the tree.

menu Part --> Create shape from mesh
menu Part --> Convert to solid
Optional: menu Part --> Refine shape

The STL from your link has many, many facets and the created solid is massive. Step 3 takes a long time to complete and does not work fully. You may be able to work with it, but things might be slow.

Step one worked ok but step two threw an error saying the shape is not a shell.
I have not been able to get past that error.
Has anyone managed to do that conversion - a fairly important feature!