Updated: Thread for screw tutorial
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Updated: Thread for screw tutorial
I updated the Thread for Screw Tutorial in the wiki for v0.19.
This tutorial was originally made with v0.14, and I think it assumed use of the Part Workbench only.
I added more information about the process using the PartDesign Workbench, and better images.
I did not touch significantly the methods 4 and 5 because the instructions they contain are a bit hard to follow in my opinion. So I would have to investigate exactly what they mean, and then re-write them.
I add in this post the files that I used to generate the models and the images. I will reference this post in the wiki as well.
This tutorial was originally made with v0.14, and I think it assumed use of the Part Workbench only.
I added more information about the process using the PartDesign Workbench, and better images.
I did not touch significantly the methods 4 and 5 because the instructions they contain are a bit hard to follow in my opinion. So I would have to investigate exactly what they mean, and then re-write them.
I add in this post the files that I used to generate the models and the images. I will reference this post in the wiki as well.
Always add the important information to your posts if you need help. Also see Tutorials and Video tutorials.
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To support the documentation effort, and code development, your donation is appreciated: liberapay.com/FreeCAD.
Re: Updated: Thread for screw tutorial
We often recommend to minimize the number of dimensional constraints, so I propose this sketch for the section: It has the additional advantage that it shows directly the important angle of 60° and omitting the obsolete construction line.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Re: Updated: Thread for screw tutorial
I think that in Thread for Screw Tutorial, the
Method 3. Sweeping a vertical profile
should be complemented explaining how to cut the thread so that no abrupt ends appears.
Furthermore, instead of using Part WB for creating the inner cylinder, Part Design WB should be used.
Method 3. Sweeping a vertical profile
should be complemented explaining how to cut the thread so that no abrupt ends appears.
Furthermore, instead of using Part WB for creating the inner cylinder, Part Design WB should be used.
I have uploaded many FreeCAD video tutorials to my YouTube channel
Re: Updated: Thread for screw tutorial
+1jruiz wrote: ↑Sat Apr 04, 2020 1:31 pm I think that in Thread for Screw Tutorial, the
Method 3. Sweeping a vertical profile
should be complemented explaining how to cut the thread so that no abrupt ends appears.
There is nothing said how threads have to be made using PartDesign. So either it has to be explained in full detail or only the principles should be shown; thats how it is now.
Furthermore, instead of using Part WB for creating the inner cylinder, Part Design WB should be used.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Re: Updated: Thread for screw tutorial
Don't know how about, but sometimes I get unwanted behavior from FreeCAD when using previous profile.chrisb wrote: ↑Sat Mar 28, 2020 9:23 pmWe often recommend to minimize the number of dimensional constraints, so I propose this sketch for the section:
Snip macro screenshot-a2eb76.png
It has the additional advantage that it shows directly the important angle of 60° and omitting the obsolete construction line.
For example, the profile shown in threadProfile.png has worked fine for me.
In the image, the arrows point the difference between the two profiles.
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Last edited by jruiz on Sat Apr 04, 2020 2:18 pm, edited 2 times in total.
I have uploaded many FreeCAD video tutorials to my YouTube channel
Re: Updated: Thread for screw tutorial
A simple way I found for cuting the ends of the thread is using a groove:
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I have uploaded many FreeCAD video tutorials to my YouTube channel
Re: Updated: Thread for screw tutorial
Another way of cutting up the thread I like best:
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- Captura de pantalla de 2020-04-04 10-21-11.png (194.76 KiB) Viewed 6566 times
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- Captura de pantalla de 2020-04-04 10-21-32.png (385.43 KiB) Viewed 6566 times
I have uploaded many FreeCAD video tutorials to my YouTube channel
Re: Updated: Thread for screw tutorial
I guess that real life bolts have neither of these, they rather have a 45° chamfer.
It may also be worth a discussion whether in PartDesign additive or subtractive sweeps are better. Most sweeps I see in PartDesign use subtractive. Together with the chamfer that seems to be easier than the additive variant.
Another topic is the inner runout in a partially threaded bolt like the Fasteners ISO4014 bolts.
It may also be worth a discussion whether in PartDesign additive or subtractive sweeps are better. Most sweeps I see in PartDesign use subtractive. Together with the chamfer that seems to be easier than the additive variant.
Another topic is the inner runout in a partially threaded bolt like the Fasteners ISO4014 bolts.
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- Snip macro screenshot-72a167.png (19.6 KiB) Viewed 6540 times
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Re: Updated: Thread for screw tutorial
Ok.
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I have uploaded many FreeCAD video tutorials to my YouTube channel