What are FreeCAD's coordinate systems?
ฝัง
- เผยแพร่เมื่อ 31 พ.ค. 2024
- This video examines how FreeCAD's coordinate systems work and how they complement each other. FreeCAD's two coordinate systems work together to help you with your designs, but they can be a little confusing at times. I will explain the differences between the two coordinate systems in this video.
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Contents
🔹 00:00 Introduction
🔹 01:12 Explanation of 3D space
🔹 03:09 Simple explanation of planes
🔹 03:53 FreeCAD's basic planes
🔹 05:35 Local coordinates
🔹 06:37 Placement and Attachments points
Workbenches used:
🔹 General
🔹 Sketcher
🔹 Part Design
FreeCAD links
👉 FreeCAD website: www.freecadweb.org
👉 Downloads: freecadweb.org/downloads.php
Copyright
Copyright Glasson Design Studio 2021. All rights reserved.
Where to find us
👉 Website: www.glassondesignstudio.com.au
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👉 Instagram: / glassondesignstudio
Credits
Writer, Editor, Producer: Geoff Glasson
Music
The Best Way to Wander
Publisher: S.I. Publishing (SOCAN)
Available through AUDIOHERO
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Thank you for your video. It is very useful for me to understand displacement and attachment.
Thanks for your kind words. I'm glad that you found it useful
Thank you for the explanation. It is very important take that into account
Intrigued! Worked CAD in aerospace where the absolute datum was some predetermined point in space just ahead of the nose cone profile. All components were positioned relative to this datum although all design construction was carried out using local XYZ coordinates. The ‘Z’ coordinate always moved in and out of the screen………..and was used for ‘clipping’ whereby anything beyond a certain negative or positive ‘Z’ value would not be displayed if the component was zoomed in or out beyond these set values.
Thanks for your comment. I've never heard of anything like that before, but I find it interesting that different software systems attack the same problems quite differently.
Nice to get some theory. Helpful. Thanks.
You're welcome. Thanks for your feedback
Thanks. Useful information.
Thanks. I'm glad that you found it useful
I watched this video 3 times. My only fear now that I understand it, is that I'll wake up tomorrow and have to watch it three times again cause I'll forget 😂
Thanks for your comment Lewis. It did my head in for a while too.
How did you get the Local Coordinate System axes to show up at 8:22?
Is this available in FreeCAD or was it added post-production in video editing.
Very helpful video! Thank you!!
Thanks for your feedback and question. I'm glad that you found the video useful. I added the axes in post production because they were not visible in the original video.
Thank you for this video. I am just starting ( retired), and was looking for a ' beginning point' to get started in CAD. It does not seem to be 'my' starting point, but I think this is, somewhat, where it all begins. Do you have other videos to teach the FeeCAD environment? In my career, it was like, ' first' principles. So that is where I need to start. Regards
Hi David, thanks for your feedback. I don't really have "first" principles type videos. You should check out a channel called "MangoJelly" which has covered topics like that
Global and local body coordinate systems on 0.20 seem to be aligned.
I haven't looked at it TBH.Thanks for letting me know
bonjour et merci pour votre travail, dommage que vous n'utilisez pas le sous-tritrage
J'espère que Google translate aura raison. Je vous remercie pour vos aimables paroles. Je ne pense pas que quiconque ait mentionné des sous-titres auparavant, donc je n'avais pas pensé à les inclure. Je ne parle aucune autre langue que l'anglais mais je vais voir ce que je peux faire pour inclure des sous-titres à l'avenir. (I hope that Google translate gets this right. Thank you for your kind words. I don't think that anyone has mentioned sub-titles before so it hadn't occurred to me to include them. I don't speak any language other than English but I'll see what I can do about including sub-titles in the future.)
Very informative., can explain how to assign coordinate to different element of machine and make one as local and one as Global
Thanks for your question. I don't believe that it is possible to do what you want to do
wgat i don't understand and was not explained is what is the reason for the z axis to be in a different direction from global to local plane (does not seem to make sense to me) ?
Thanks for your feedback. The general purpose of a local plane is to simplify creating features that are not based on the three standard planes. Think of a local plane like a piece of paper. A local plane is typically used for sketching on and since sketching is a 2D operation, you can only draw in the X and Y coordinates. The local Z axis is different to the global Z axis because it is always perpendicular to the local plane. FreeCAD handles the maths involved in converting from local to global coordinates so that you don't have to worry about it.
@@GlassonDesignStudio thanks for the reply, makes it much clearer. I wonder, have you had any experience in designing BSP parallel and tapered threads in freeCAD ? I've used the fastners workbench but it does not support BSP threads. A video on BSP threads would be awesome ;-)
@@GlassonDesignStudio that's an awesome answer to an awesome question. this video is great BTW.
Ouch, my brain hurt and thanks for hurting it.
Here, two pills of Tylenol.
That's what I took, and now I feel a lot better.
Help please. When i import svg file, coordinate axes stay away from object
Thanks for your question. I don't really understand what you are trying to do. Can you give me a bit more detail please? How are you importing it - as a drawing or as geometry? Have you tried transforming the elements?
@@GlassonDesignStudio As geometry. Yes when I want to move object axes are not on him but far away. Coordinates show 0,0,0 but axes still not at the object
To be honest with you, I haven't done this before so I don't have good advice for you. The tests that I've done suggest that you can convert them into parts using the Upgrade tool in the Draft workbench. It looks like you can importing them into a sketch that is *NOT* part of a body (created in Part Design Workbench), but overall it seems to me that you'll need to do a fair bit of work once you've imported the SVG. I'm sorry that I can't be of more help. Have you tried on the forums?
@@GlassonDesignStudio Yes i convert them into part using upgrade tool in Draft. Then importing them into sketch. I tried search answer in internet but didin't find
@@GlassonDesignStudio I extruded imported svg file as sketch in part design as body but stil same problem with axes
You are knowlegdeable on the basics enough, but the video makes the subject look more confusing than it is. The video jumps from one topic to the next, skipping over some of the details while spending too much attention on others. If you feel it is neccessary to explain what a cartersian system is, the topic of datum planes and the topological naming problem might be better omitted for clarity.
You introduced two terms global and local systems, but you referred to then you use '3D coordinate space' (7:20) to refer to the global system(?). You also name it the 'global' system, but as I understood your explanation, you meant the coordinate system determined within the body. Yeah, I got confused by this video as well.
It's simple: you draw the sketch in the coordinate system of the sketch. The placement point is the point where the origin of the feature is placed within the body. The attachment point gives an offset. This could have been explained in less time than this videos runtime.
What happens if you use more than one body in a single project? Is it preferable to move features with their placement points or their attachment points?
Hi Jason, thanks for your feedback. I certainly didn't set out to make it confusing, but thank you for pointing out that I did. I will take your comments on board and look at making an improved video. I will also look into your other questions.
@@GlassonDesignStudio Thank you for taking it this way. Teaching a topic with so many ins and outs as CAD drawing is less straightforward than it first might appear. Kudos to you for taking it as a learning experience.
From the trainee's point of view: I have watched more than a few entry level videos made by people who meant well and did their best. On a few occasions I ran into issues (and lost quite some time) when the 'working solution' was not a proper solution (eg. not scalable).
I have learned a bit as well since my last post, and I think a better way to approach it would be to create a single part, with the bodies nested in there. But this might be another case of One Eye leading the blind as well.
There are many good resources on youtube.
th-cam.com/channels/7pokUsRb6q2B0FOzSqQLlw.html
I'm too old to think that I know it all :P. I appreciate people talking the time to give me constructive feedback even if I don't particularly like what they are saying. IMHO that's the way to learn and find better ways of doing things. I appreciate that you've taken the time to leave feedback when too many people would simply write me off as being a tosser. Thanks again.