A tapered thread with more problems

SupDoc · Post by **SupDoc** » Tue Dec 10, 2019 6:58 pm

As you can see from the image, after doing the sweep with the triangle, and applying the Boolean cut operation - the cut only removed the left half of the triangle. Any idea what is going on, and how to fix this?

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.4 (GitTag)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

SupDoc · Post by **SupDoc** » Tue Dec 10, 2019 7:01 pm

Adding the file.

Rana · Post by **Rana** » Tue Dec 10, 2019 7:19 pm

You are adding thread on tapered surface .

Your triangle profile is in tapered surface, modify it to go out of tapered surface to see the cut properly(correctly). Hope this helps.

SupDoc · Post by **SupDoc** » Tue Dec 10, 2019 9:14 pm

That did the trick! Thanks,Rana.

papyblaise · Post by **papyblaise** » Tue Dec 10, 2019 9:21 pm

Manage 0.3mm to right for the sketch of the cylinder , or to left for the triangle , and all is perfect , especialy for the begening of the thread to the chanfer

Post by **chrisb** » Tue Dec 10, 2019 9:31 pm

If you work in PartDesign, you should use a PartSesign subtractive pipe to create the thread.

SupDoc · Post by **SupDoc** » Tue Dec 10, 2019 10:07 pm

I fixed the taper problem, as you can see from trans_to_fittings2 and got exactly the threads I wanted. However, when I added a fillet to the outer radius and a small cylinder to the outer rim, everything changed & I lost my threads.

It did tell me that I was working with an inactive form. What does that mean & how do I fix that?

Where did my threads go & how do I get them back?

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.4 (GitTag)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

freedman · Post by **freedman** » Wed Dec 11, 2019 6:29 am

I have found it's best to add the thread instead of trying to cut it out. I also added a starter to the thread. I changed many dims so this is an example.

papyblaise · Post by **papyblaise** » Wed Dec 11, 2019 7:19 am

erase Cut , do the small Pad , the chanfer , and finish by Cut , if you need add some other op , allway finish by Cut

Post by **chrisb** » Wed Dec 11, 2019 7:22 am

I joined your two topics. Please create new topics for new questions or issues and reuse existing if you add contributions to them.

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