Boolean Helix Bug

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Outsourced
Posts: 81
Joined: Wed Feb 03, 2021 8:07 am

Boolean Helix Bug

Post by Outsourced »

Hello FC,
Hope you are all well,
OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/Australia (en_AU)

Imagine a Wire-rope hoist drum, You need the grooves to be as close to each other as possible, So I've been experimenting for over a week now on this little chestnut.
https://youtu.be/_VgqQ8U5V8w
Shows the scenario Now matter what (including a Compound) Part Boolean Cut & Part D. Boolean cut. It will not give me the 'w' groove profile obtained when Pitch = rope Dia.
Perhaps this is a bug & needs to be reported?
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Shalmeneser
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Re: Boolean Helix Bug

Post by Shalmeneser »

Video too small !
Pictures ?
FILE ?
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Shalmeneser
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Re: Boolean Helix Bug

Post by Shalmeneser »

Pitch = Radius => usual coplanarity problem
Pitch = Radius + 0.0001 => OK
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Capture du 2021-12-01 23-45-36.png
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chrisb
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Re: Boolean Helix Bug

Post by chrisb »

No need to report. It is known, comes from OCC kernel, and I learned from other users, that at least some of the big boys have similar limitations.
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Outsourced
Posts: 81
Joined: Wed Feb 03, 2021 8:07 am

Re: Boolean Helix Bug

Post by Outsourced »

Hhey thx for the reply,
I did try and upload the file, perhaps the storages is full? its a small file 4.4kb attachment error shown. I did also try that trick with the pitch +0.1mm even but for what ever reason the pitch will not generate below1.25*Rope Dia. Is there some other way I can get the file across?
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Screenshot 2021-12-02 135559.png
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Outsourced
Posts: 81
Joined: Wed Feb 03, 2021 8:07 am

Re: Boolean Helix Bug

Post by Outsourced »

Thx Shalmenser,
Using primitives and a different train of thought I was able to produce the results shown
https://youtu.be/5Vl8jrfHrPU
Frustration there's a bug in part design I imagine the problem may be worse with Multi-start threads in 'Part Design'? -New isn't always better
chrisb
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Re: Boolean Helix Bug

Post by chrisb »

I just tested: I could upload a 400K file. So no problem on this side.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
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