Create two pads on the side of a cylinder

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meme2704
Posts: 2926
Joined: Sat Apr 01, 2017 2:47 pm
Location: Vosges

Re: Create two pads on the side of a cylinder

Postby meme2704 » Thu Jan 31, 2019 4:28 pm

The tank will be made out of 50mm thick PP sheets.
I am a little skeptical about the mechanical strength of this tanck
you have to be a super specialist to weld PP
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NormandC
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Joined: Sat Feb 06, 2010 9:52 pm
Location: Québec, Canada

Re: Create two pads on the side of a cylinder

Postby NormandC » Thu Jan 31, 2019 5:56 pm

arcol wrote:
Thu Jan 31, 2019 3:23 pm
Well, it is a 4m3 water tank (under the earth surface), but I'm not quite sure the guy well understood my requirements over the phone.
So I want to draw it.
The way you're doing is fine then, it's to give general dimensions and the fabricator will go into the details himself.

arcol wrote:
Thu Jan 31, 2019 3:23 pm
now I'm deep in techdraw tutorials,
my front/left/right views are all rotated in space, so each view looks like a perspective view.
In v0.18, view creation was changed in TechDraw. The view orientation is taken from the orientation in the 3D space. So to generate a top view in TechDraw, you first need to set the top view in the 3D space. It may be possible to change the orientation of the base (principal) view from its properties, but I haven't tried.
arcol
Posts: 221
Joined: Sun Nov 10, 2013 9:02 am

Re: Create two pads on the side of a cylinder

Postby arcol » Thu Jan 31, 2019 7:42 pm

NormandC wrote:
Thu Jan 31, 2019 5:56 pm
The view orientation is taken from the orientation in the 3D space.
Yepp, that was the key issue.

I'm almost done, only the incoming pipe is missing. I can not create it with the sweep tool, freecad just hangs.
Here is the freecad file:
water_tank_wip3.FCStd
(468.31 KiB) Downloaded 10 times
Here is a screenshot about the problematic part:
water_tank_incoming_pipe_todo2.png
water_tank_incoming_pipe_todo2.png (9.73 KiB) Viewed 342 times
chrisb
Posts: 24399
Joined: Tue Mar 17, 2015 9:14 am

Re: Create two pads on the side of a cylinder

Postby chrisb » Thu Jan 31, 2019 11:05 pm

On loading your file I get already lots of errors:

Code: Select all

App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem" thrown
App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem004" thrown
App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem005" thrown
App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem" thrown
App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem004" thrown
App::Document::_RecomputeFeature(): Unknown exception in Feature "ProjItem005" thrown
Gui::Command::activated(0): Unknown C++ exception thrown
If I delete Page the errors vanish.

If I then try to open Sketch008, I get an error message saying that there is a problem with external references. This means you have changed something in an earlier step and the construction of your model is not robust. With the Sketch validation tool I can remove these references, but looking at them makes my FreeCAD crash. Someone should try this with a current daily.
chrisb
Posts: 24399
Joined: Tue Mar 17, 2015 9:14 am

Re: Create two pads on the side of a cylinder

Postby chrisb » Thu Jan 31, 2019 11:15 pm

Finally the crashes vanished :?: .

Your sweep has self intersections. Move the path to the side of the tube, change to round corner transition, and the sweep will succeed.
Attachments
Bildschirmfoto 2019-02-01 um 00.11.15.png
Bildschirmfoto 2019-02-01 um 00.11.15.png (17.9 KiB) Viewed 332 times
chrisb
Posts: 24399
Joined: Tue Mar 17, 2015 9:14 am

Re: Create two pads on the side of a cylinder

Postby chrisb » Thu Jan 31, 2019 11:36 pm

If you change Sketch007 to two concentric circles you get the tube directly.
arcol
Posts: 221
Joined: Sun Nov 10, 2013 9:02 am

Re: Create two pads on the side of a cylinder

Postby arcol » Fri Feb 01, 2019 7:36 pm

chrisb wrote:
Thu Jan 31, 2019 11:36 pm
If you change Sketch007 to two concentric circles you get the tube directly.
If I change the 45 degree line to an arc then it succeeds too:
4m3_szennyviztarolo.png
4m3_szennyviztarolo.png (16.31 KiB) Viewed 314 times
Here is the final freecad file:
water_tank_wip3.FCStd
(469.62 KiB) Downloaded 32 times
arcol
Posts: 221
Joined: Sun Nov 10, 2013 9:02 am

Re: Create two pads on the side of a cylinder

Postby arcol » Fri Feb 01, 2019 7:38 pm

meme2704 wrote:
Thu Jan 31, 2019 4:28 pm
The tank will be made out of 50mm thick PP sheets.
I am a little skeptical about the mechanical strength of this tanck
you have to be a super specialist to weld PP
Well, if you are interested, I can post you some photos, once it is manufactured, which is 6-8 weeks.
kisolre
Posts: 2134
Joined: Wed Nov 21, 2018 1:13 pm

Re: Create two pads on the side of a cylinder

Postby kisolre » Fri Feb 01, 2019 8:06 pm

arcol wrote:
Fri Feb 01, 2019 7:38 pm
Well, if you are interested, I can post you some photos, once it is manufactured, which is 6-8 weeks.
You could post the story here :)
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