Creation of additivepipe fails

[MIKE_BRANDT]

i have been having trouble with additive pipe also
i am making a model of a bottle cap with 2 thread starts
when i do a polar array to get the second thread, made with an additive pipe, the thread turns inside out and becomes a subtractive element

tried multiple combinations of boollion and cuts

i remembered in the 90dys in cad-key, that i had to make the outline of my extrusion in a continuous series with the beginning of one segment connecting to the end of the previous line

i did this in a clockwise direction i think cadkey needed a counterclockwise loop but that was a long time ago
this seems to take care of the problem

i hope this helps


spiel check takes care of most problems but i cant always tell

[MIKE_BRANDT]

Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.1.29410 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Curves 0.5.12
  * Help 1.0.3

and
OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 2022.1112.26244 +5306 (Git)
Build type: Release
Branch: LinkDaily
Hash: c64e4a49244a1c0ce9fd6455d18aa919d0db9c80
Python version: 3.8.10
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.6.2
Locale: English/United States (en_US)


i had the same problem with both veersions

[chrisb]

I have split this from the other topic which just happened to have the same title.

Without the file it is hard to say anything about the cause of the fail.

[MIKE_BRANDT]

i asked about this problem in
disappearing polar array earlier this week

the solution given was to build up the polar array piece by piece
which seemed to work until i added on more features.

i went back to pounding my head against the wall and came up with keeping the sketch profile tail to tip. which calmed down the model
i also made up a helix from 30 deg arc segments but this did not seem to correct the problem but i left it in because of laziness.


the final model is to large to attach 3944kb

[MIKE_BRANDT]

disapearing polar array

this is the the original file that i made that had the problem

[drmacro]

I prefer to start with the less esoteric portions first and build on them. In this case, I rotated Sketch002 away from the base plane by 10 degrees to get the seam line out of the way of later features.

I used Check Geometry on each feature as I built it to confirm the result was valid. The final solid passes geo check with BOP turned on.

[MIKE_BRANDT]

where do find check geometry

[chrisb]

where do find check geometry

In the wiki, where it's always worth looking: Part CheckGeometry.