A suggestion - when calibrating use a longer "line". In this case instead of using 1 cm on the ruler, use the 10 cm. This would reduce any error introduced in the clicking process by a factor of ten.
There is about 5% difference between 0-1 and 9-10cm on this ruler. So what you are saying It's 100% true if you are using scan, if you are using photo you need to be careful with that, there is always a fisheye effect. In case that is represented in this video, you will get better results by taking a shorter sample nearest the actual object.
@@kacperzawada2835I always use the highest zoom on my camera and stand back to make that possible. That way the fisheye effect is minimized. And I do find that the scaling is more accurate over a longer span of the ruler. It’s too easy to be off by a significant percentage if you use a span that is significantly shorter than the object that you are trying to model.
@@harrymagooslum5770 I like to take pictures from distance too. And yes, if you minimize fisheye effect then the longer sample the better. But in case represented in video the fisheye effect is so severe, that it's better to sample shorter distance closest to object, so both are affected similarly, going with longer span of the ruler gives you over 2% error just from fisheye, I think we can clip scaling tool much more accurately
This is great, but I would add a note. To improve accuracy, if at all possible use a scan rather than a photo. A simple document scanner will work with a lot of flat parts. Second, if you are using a photo, you should try to correct for lens distortion before using the photo for modelling. You would be surprised how much our photos are distorted by lens curvature. I use Darktable which is able to correct for a wide array of popular lenses, and is free-open-source.
This 1000%. Not only will a scan get rid of distortion from the lens and the angle, but it also gives you precise measurements. Generally if you set your scan to 600 dpi, each inch will be 600 dots. Setting your scale to pixels will give measurements accurate to about 0.01 inches. Check your scanner by scanning a ruler too.
Thanks a ton for your FreeCAD videos, I've been trying to get started with some 3D design projects and I've had a hard time getting oriented. Your last tutorial was excellent, would love to see more!
Don, this is a fantastic intro into some of the functionality of freecad. Looking forward to trying this out for some brackets. Loved the way you explained the process, very concise and mentally digestible. Again, thank you.
B spline is a good way for angles/curves. Allows for more fine tuning. I think constraint tangent would work as well but don’t quote me on that. Just some things I use. But I’m no pro by any means
I wonder if using Inkscape to trace the outline of a part then export that trace - with an appropriate scale element, might help? I gather FreeCAD can import svg, so perhaps it would save you from having to manually trace a part.
When I subscribed to your site a video of you explaining your cancer came up. I am devastated. This one video has informed me more than a dozen other videos on how to productively use Freecad. I would pay to have more of your clear and informative videos. Thank you.
Hey Don your videos have been helping me out alot, I am fairly new to CAD and I am having trouble with a arched line, the 2d piece I am sketching has 2 straight lines but the 4th being the top is curved and raised 2mm at the center how do I go about this?
Wow cool video, thanks! And, could you show us how to prepare model for the laser cut, if we need file like 2D blueprints in dxf or something like that format
I'm having trouble trying to add a pocket to the existing body. It won't let me do it and when i try to create a sketch, freecad brings up the axis selector vs going right to the sketch like yours. Any insight?
Cool video, however somewhere between creating the inner pockets and actually hitting the create pocket button, something doesn't work on my end. Instead of rectangles, I've drawn circles and no matter if I hit create pocket or create hole, it just doesn't do what I see in your video. I've even tried to follow every step by step and I get to this point and it just doesn't work. Any ideas?
This video should already have 10x the views. YT algorithm sucks unless you make jackarse content Notice how anything of any REAL educational quality doesn't blow-up but ignorant hack vids that have zero real life use get millions of views If you're here .. I hope you understand ... YOU, yes you .. are far few in-between on this planet of intelligence seeking more input (short circuit)
It's impossible to take a photo without perspective and lens distortions. Without some king of algorithm to deal with these distortions this method will be very inaccurate.
this vid is crap freecad no longer has image workbench soo nothing in this video applies to those of us who just downloaded it and thus i still cant crop a part from an image to manipulate or rework or 3d print my free cad has all different icon's also so maybe do another vid on the freecad the rest of us have. I tried to find that crap icon you clicked on to make part a 3d model but i don't see that either it must be from one of the 500 workbenches available freecad is boo &%@@!! ive spent a week trying to crop part out of pic i still cant even put measurements for the part dimensions boo sh !worst cad and worst teaching vid
A suggestion - when calibrating use a longer "line". In this case instead of using 1 cm on the ruler, use the 10 cm. This would reduce any error introduced in the clicking process by a factor of ten.
There is about 5% difference between 0-1 and 9-10cm on this ruler. So what you are saying It's 100% true if you are using scan, if you are using photo you need to be careful with that, there is always a fisheye effect. In case that is represented in this video, you will get better results by taking a shorter sample nearest the actual object.
@@kacperzawada2835I always use the highest zoom on my camera and stand back to make that possible. That way the fisheye effect is minimized. And I do find that the scaling is more accurate over a longer span of the ruler. It’s too easy to be off by a significant percentage if you use a span that is significantly shorter than the object that you are trying to model.
@@harrymagooslum5770 I like to take pictures from distance too. And yes, if you minimize fisheye effect then the longer sample the better. But in case represented in video the fisheye effect is so severe, that it's better to sample shorter distance closest to object, so both are affected similarly, going with longer span of the ruler gives you over 2% error just from fisheye, I think we can clip scaling tool much more accurately
This is great, but I would add a note. To improve accuracy, if at all possible use a scan rather than a photo. A simple document scanner will work with a lot of flat parts. Second, if you are using a photo, you should try to correct for lens distortion before using the photo for modelling. You would be surprised how much our photos are distorted by lens curvature. I use Darktable which is able to correct for a wide array of popular lenses, and is free-open-source.
This 1000%. Not only will a scan get rid of distortion from the lens and the angle, but it also gives you precise measurements. Generally if you set your scan to 600 dpi, each inch will be 600 dots. Setting your scale to pixels will give measurements accurate to about 0.01 inches. Check your scanner by scanning a ruler too.
@@senseisecurityschool9337great tutorial
What about using graph paper as the background.
Oh not a bad idea
You might consider drawing only half of it precisely and then mirror your drawing 😉
Thanks a ton for your FreeCAD videos, I've been trying to get started with some 3D design projects and I've had a hard time getting oriented. Your last tutorial was excellent, would love to see more!
Don, this is a fantastic intro into some of the functionality of freecad. Looking forward to trying this out for some brackets. Loved the way you explained the process, very concise and mentally digestible. Again, thank you.
Cool bro fast and to the point ☝️ thank you
This is an excellent how to, thank you!
B spline is a good way for angles/curves. Allows for more fine tuning. I think constraint tangent would work as well but don’t quote me on that. Just some things I use. But I’m no pro by any means
I wonder if using Inkscape to trace the outline of a part then export that trace - with an appropriate scale element, might help? I gather FreeCAD can import svg, so perhaps it would save you from having to manually trace a part.
When I subscribed to your site a video of you explaining your cancer came up. I am devastated. This one video has informed me more than a dozen other videos on how to productively use Freecad. I would pay to have more of your clear and informative videos. Thank you.
life saving. thank you. something like this in blender3d?
Great video. Shouldn't we ask freeCad makers to add more select functions like color/magic wand/area/ select in the next update ?
What to see how to use photogrammetry software to model an irregular object and get that model into freecad...
The part is symmetrical, so sketching one side is sufficient ;) Nice video.
I do laser engraving with Co2 laser and fiber laser. Would this program help with me making stuff
Great video, as always. I have 0.21.1, but the Import option under the File menu is not bold and not available. Does this feature require a plug-in?
Create a new file first, then import.
Hey Don your videos have been helping me out alot, I am fairly new to CAD and I am having trouble with a arched line, the 2d piece I am sketching has 2 straight lines but the 4th being the top is curved and raised 2mm at the center how do I go about this?
This was a great video. I too want to use freeCAD for 3D printing. Thanks!
Wow cool video, thanks! And, could you show us how to prepare model for the laser cut, if we need file like 2D blueprints in dxf or something like that format
I'm having trouble trying to add a pocket to the existing body. It won't let me do it and when i try to create a sketch, freecad brings up the axis selector vs going right to the sketch like yours. Any insight?
i cant find the calibrate option under version 1.0.0
You could also just change view mode to wireframe and you would see the image behind without changing transparancy
Cool video, however somewhere between creating the inner pockets and actually hitting the create pocket button, something doesn't work on my end. Instead of rectangles, I've drawn circles and no matter if I hit create pocket or create hole, it just doesn't do what I see in your video. I've even tried to follow every step by step and I get to this point and it just doesn't work. Any ideas?
I have the same problem...it won't create the hole/pocket no matter what I do. Is there an update to this video?
Helpful videos, thanks
let'ssss gooo, i'm learn a lot from this
For this video, I must subscribe. Thank you.
Thanks you for a great video. :)
ANy new free cad things/tips you've learned since this video came out ?
this was super helpful.
((( ABSOLUTELY ))) PERFECT TO MY NEEDS !!!!! AWSESOME !!!!!!!!!!!!!!!!!
Cheers bro!
Awsome!
This video should already have 10x the views. YT algorithm sucks unless you make jackarse content
Notice how anything of any REAL educational quality doesn't blow-up but ignorant hack vids that have zero real life use get millions of views
If you're here .. I hope you understand ... YOU, yes you .. are far few in-between on this planet of intelligence seeking more input (short circuit)
U r just awesome!!!
I know this is only a demo... But you probably could have tape down the paper part to make it flatter...
always do half and then mirror it :)
It's actually easier to put pen datum marks on a flat object before you photograph it ,rather than messing around with rulers and coins in the image
that assumes your marks are accurate/precise compared to the alternative.
for me it says "wire is not closed"
Great
Super.
👍❤️
It's impossible to take a photo without perspective and lens distortions. Without some king of algorithm to deal with these distortions this method will be very inaccurate.
Great video . K i s s
th-cam.com/video/wAPqMJYWCHI/w-d-xo.html
this vid is crap freecad no longer has image workbench soo nothing in this video applies to those of us who just downloaded it and thus i still cant crop a part from an image to manipulate or rework or 3d print my free cad has all different icon's also so maybe do another vid on the freecad the rest of us have. I tried to find that crap icon you clicked on to make part a 3d model but i don't see that either it must be from one of the 500 workbenches available freecad is boo &%@@!! ive spent a week trying to crop part out of pic i still cant even put measurements for the part dimensions boo sh !worst cad and worst teaching vid
import file > press your image
Search for Mango Jelly's video "Why has the Image Workbench been removed in FreeCAD 0.21 ?" if you're not figuring this out. It also works in 1.0 RC2.