Understanding FreeCAD: Lesson 4 Auto Scale Features with Formula | Part Design | Beginners Tutorial
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- เผยแพร่เมื่อ 31 พ.ค. 2024
- Lesson 4 We will be learning about how to create and use formulas in FreeCAD to reference features such as pads and pockets to other features so we can, for example scale one pad in the part design workbench and other pads and pockets will adjust themselves automatically. We will create a simple object where each feature (pads, pockets etc) will be linked together via a formula so, for example when we come into a pad and change the thickness and / or length, all of the other features will automatically update with the new thickness and length even if we want features such as pockets that are set, for example, half way through a wall, we can automatically update these to reflect the new depth when other features are updated. We will even look at references geometry in FreeCAD's sketcher workbench and reference this to a pad in the partdesign wb.
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Another useful tutorial. I prefer using spreadsheets. When using sketches or pads to reference the 'base' dimension it is important choose the correct one. i.e. 001 or 002 or the original.
Yes agree, I can't remember how many times I have made that mistake of referencing the wrong one and sat wondering why everything is looking odd.
Thanks you😀😀
Thank you for making it simple.
When you typed in "/2" then clicked on OK, it was so fast that I missed it the first several times through. I had to slow the video down to .5 to even see it, and even then it flew off the screen fairly quickly. It might help the visual if you could freeze-frame the screen in the video editor you use, so that the "/2" portion of what you first typed into the Formula Editor shows up for an extra 2 seconds or so, beyond what it does at normal speed. Anyway, this resizing thing is really cool! Thanks for showing this to us all!
Sorry about that I will make sure I slow down next time. Glad you liked the video and thank you for the feedback.
Very useful thanks!
May I say that while your videos of a few years back were good, from what I have seen of this new series so far they are a lot better. I think this is mainly because the early videos in the last series tended to focus on a specific command/commands. This caused some issues for me.
Firstly, in isolation, there was little that could be done with each command, and it wasn't always obvious to me how useful they in fact were. There wasn't a sense I was learning very much at all. Secondly, once a command had been learnt, I found it was easily forgotten - partly because it wasn't being used again in the following videos. Thirdly, the videos I saw in that series, being very simple, didn't show mistakes - common input errors, or the foibles of Freecad; and therefore didn't show how to spot or correct them. I thought every 'error' was due entirely to my own stupidity, when in fact some, at least, were just inconsistences in FC or easily made and simple mistakes. As an example - the earlier version of FC did have an option for Sketch Validation; but it wasn't clear to me - or from posts elsewhere, to many others - how to activate it as under many circumstances it was greyed out... Here, we are shown exactly how to use it.
This new series of videos, because they go straight in with full model creation - together with some improvements to FC itself - have solved those issues and made the whole thing more understandable, easier to remember, and progress much faster for my simple and ageing mind! Well done and thankyou for your excellent work.
Thank you for the feedback, what you highlighted about how the videos changed was from me sitting down for a few weeks, back tracking through all the comments and changing the delivery and this was the first series that came from that overhaul. The learning freecad series is another one but there was a change in my setup which cause a the volume to be a little low in the early parts of the series found through the comments. Again I had a small overhaul and purchased a decent microphone and boom to help. I am always keeping an eye on the comments as its the only way to get better content that the community wants. Thank you for taking the time to write. Really appreciate the feedback.
04:00 - there is a special command for drawing a square - create a square with the center.
The rest is very informative. Thank you.
(sorry, translation DeepL Translate)
That was introduced in 0.20.
Better with spreadsheet! ;-)
😁
This looks like a good option, in some cases. I tend to get lost with using a split screen and going back and forth between the two documents. Just out of curiosity what version of FreeCad are you using here?
I'm using freecad 0.19
I'm following through these and just wonder, do we have to do them in number order or can we jump around say do lesson 2 then 15 then 6 etc.?
same with can we flit between understanding freeCAD and Learn freeCAD or should we do one 'course' then the other
You can do then in what order you like. I have planned then as individual videos so you can dive in where you want. Even the formula 1 themed tutorials I am planning so you can say start from the tyre and work backwards rather than the wheel nut and work forwards. I found if I release long tutorials not many will sit through the whole hour or so and end up missing things. Subject or tool based seemed to be more attractive. This way you can pick and choose.
Thanks, good to know I can jump around on them if I wish. yes I think 1+ would be a tad too long esp. if you think we are possibly watching, pausing, rewinding then doing the things you are so that 1 hour could take us 1:30-2:00 to complete, not including when we don't get the same results and have to backtrack LOL
It is possible to create features based on equations? For example in other parametric softwares you can say that if the part it is 100mm in length to have two holes, if the length of the part is 200mm to have three holes, etc.
Just compiling a video now to answer your question with an example. I started typing the answer then I realised it will be easier to create a video. Just waiting on the output and will post shortly.
th-cam.com/video/wnV6kpPbNtg/w-d-xo.html
Hi, could you please share your settings? I end up getting different results some times. Thanks.
Hi, the settings I use are standard freecad settings. What different results are you getting?
Why not just use mirror for the 2nd hole?
You can but the lessons was concented on understanding formulas. I don't like to put too many techniques in one tutorial otherwise it can make the learning too steep.