Help with polar pattern

[grumpyPandou]

Hi everybody,

I am new to this forum and I'd like some help on a basic project. I am using a 0.17 version of Freecad (cf bottom). I know it's not the last release, have started to download the newest but my connection is very, very slow... I have search the forum but don't find my answer, to be honest there's a lot of topics to deal with.

So my problem :

I'd like to do this :



I designed this :



And I don't know how to copy the selected part to have the expected result.

I was thinking polar pattern but I have to choose a part and I cannot have all of them copied :



As you can see in the screenshot I tried to made a second body but the result is worse.

So, I imagine the answer is not that complex but cannot find it.

I really hope you will able to help me.

Thanks.

--------
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13541 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: French/France (fr_FR)

[jmaustpc]

Hello, welcome to FreeCAD.

my connection is very, very slow...

I know the feeling, I have had a few connection problems and slow downs over the last few weeks, I assume due to the massive increase in Internet traffic due to all the corona virus lock downs around the world. i see you are French, i am on the other side of the planet in the Australian outback.

So my problem :

I am using a 0.17 version of Freecad

your problem is very old obsolete software, the function you want did not exist back then.

from memory, to get that to work properly you need a recent snap shot release of FreeCAD 0.19, the last release version 0.18 is now rather old, you will find 0.19 is in good condition now, almost at next release quality and will have many bug fixes passed 0.18.

Jim

[kisolre]

My guess is not proper constrained central tube -probably slight shift towards rectangular pad, which makes the first pad to succeed but the polar one fails. Hard to tell without a file.

[jmaustpc]

My guess is not proper constrained central tube -probably slight shift towards rectangular pad, which makes the first pad to succeed but the polar one fails. Hard to tell without a file.

Quite likely, but my point is that he is trying to do a polar pattern feature with a feature that has two components, (a Pad and a Pocket), that was not supported back in 0.17.

Also it looks like he is trying to make an array of separate solids rather than an intersecting Pattern feature defining a single contiguous solid within a single Body, note he has two Bodies, it seems like the centre part is in one Body and he is trying to Pattern using a secomd body rather than a feature of the first body hence trying to create an array of separate solids,

As you say, without the file its hard to be complete and accurate.

But I am also saying this just from memory ... the extra functionality may well have been added earlier than 0.19...

[chrisb]

The possibility to select more than one feature was already available, although it was one of the most cumbersome selection mechanisms I've ever seen. I think it is still the same in 0.18, it was only recently improved in 0.19.
Documented by NormandC: https://forum.freecadweb.org/viewtopic. ... 10#p178410

[openBrain]

Indeed with older versions of FreeCAD, it can be simpler to polar pattern each feature separately.
But I guess Jim caught the biggest problem. The centre Pad is in a different Body, thus the pattern, despite it seems to be physically bound by the hollow cylinder, is actually several separate solids which is forbidden.

[papyblaise]

In fact you must draw all part in the same body in V17 too
don't forget "Refine =true if you want a compact part whithout separate lines

[grumpyPandou]

Thank you all for your answers.

I see the version is probably an answer so I am downloading the 0.19.

Foir information the central tube is well constraint and in my first attempt I had all in one body. I was able to polar each item seperately but there were approximations that make the result bad (for exemple the hole in branches not centered).

I give you news with the last version.

Thank you again for the answers.

[grumpyPandou]

Ok, I finally manage to make my Polar thank to the link of chrisb.

I join the file this time to help you. Because I have now an error I don't understand :



When making a fillet on edges, it works for some but not for two...

I tried in one operation (the screenshot) or several on each edge and I get the same error...

Also I updated Freecad.

Thank you for your help.

OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.20477 (Git)
Build type: Release
Branch: master
Hash: 7d8ab175a68e476427e6e337fe3099b52da49dc8
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: French/France (fr_FR)

[chrisb]

If you zoom in on the right upper corner of the selection ...

Bildschirmfoto 2020-04-12 um 20.07.33.png (38.98 KiB) Viewed 1021 times

... you see that from the first source part the borders are not really aligned, that is the reason for the failure:

Bildschirmfoto 2020-04-12 um 20.10.34.png (30.41 KiB) Viewed 1021 times

It comes from the way you cut the slope.