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by hammax
Mon Aug 17, 2020 7:43 am
Forum: Forum in Deutsch
Topic: 3D Kontur auf Flächen projizieren
Replies: 1
Views: 233

Re: 3D Kontur auf Flächen projizieren

... die CADler sind eher visuell orientiert.
Bildchen oder Modell wäre eine gute Inspiration!
Außerdem ist hier schon ein Workflow beschrieben:
https://forum.freecadweb.org/viewtopic. ... 43#p376430
by hammax
Sun Aug 16, 2020 2:13 pm
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 14
Views: 1218

Re: Help in designing an Archimedes Wind Turbine

... totally easy = click on Array and hit the Space bar. This way you can visualize or hide every item. That's one of the reasons why I am using PartWB preferably. In PartDesignWB you always must obey and follow the hierarchical sequence. https://forum.freecadweb.org/viewtopic.php?f=13&t=34432&p=424...
by hammax
Sun Aug 16, 2020 8:11 am
Forum: Forum in Deutsch
Topic: Prob. mit Strömungssimulation
Replies: 35
Views: 2645

Re: Prob. mit Strömungssimulation

... zirkular bewegte Strömung in CFD. https://forum.freecadweb.org/viewtopic.php?f=3&t=49371 Axial durchströmter Rotor der "blumigen" Bauweise => war mir zunächst aerodynamisch eher suspekt. Aber die geometrische Konstruktion bietet zahlreiche Varianten und Alternativen. Um für die Blattform sowas w...
by hammax
Fri Aug 14, 2020 7:06 am
Forum: Forum in Deutsch
Topic: Grafik aus CorelDraw X7
Replies: 9
Views: 541

Re: Grafik aus CorelDraw X7

... versuch's mal mit der etwas einfacher handlebaren PartWB:
Import_SVG.PNG
Import_SVG.PNG (19.22 KiB) Viewed 474 times
by hammax
Thu Aug 13, 2020 7:03 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 14
Views: 1218

Re: Help in designing an Archimedes Wind Turbine

... I see in the linked website some CFD pictures of this "Archimedes" blade. I also made a very quick and dirty trial to check the unfolding and bending of the blade with cardboard. A disc with diameter 440mm cut into half could do it. The axle is an aluminum pipe with a square cross section able t...
by hammax
Tue Aug 11, 2020 1:18 pm
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 14
Views: 1218

Re: Help in designing an Archimedes Wind Turbine

... my estimation is:
unrolling the blade gives a regular disc. Maybe some sector must be cut out => better not after some finetuning.
A simple part in aluminum with some bolts and a pipe as axle.
3 blades.


ArchWindTurbine_5.PNG
ArchWindTurbine_5.PNG (42.5 KiB) Viewed 660 times
by hammax
Tue Aug 11, 2020 8:44 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 14
Views: 1218

Re: Help in designing an Archimedes Wind Turbine

... which way does the wind come from?


ArchWindTurbine_4.PNG
ArchWindTurbine_4.PNG (45.85 KiB) Viewed 713 times
by hammax
Tue Aug 11, 2020 6:33 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 14
Views: 1218

Re: Help in designing an Archimedes Wind Turbine

... having some doubt concerning the aerodynamic efficiency of that prop,
here is a possible design method in FC.

ArchWindTurbine_3.PNG
ArchWindTurbine_3.PNG (49.47 KiB) Viewed 762 times
by hammax
Mon Aug 10, 2020 4:13 pm
Forum: Forum in Deutsch
Topic: Bastel mal wieder
Replies: 13
Views: 1330

Re: Bastel mal wieder

... ich habe mir gerade den Teil des Videos von Min 9 bis 49 reingezogen. Mechanik-Vorlesungs-Reminiszenzen von vor 50 Jahren kamen wieder hoch. Und der Respekt vor den mehr oder weniger neuen Entwicklungen. Man sieht und bestaunt ja mittlerweile dank Internet viele dieser Beispiele in Bildform. Dam...
by hammax
Sun Aug 09, 2020 6:47 am
Forum: Help on using FreeCAD
Topic: Scaling in the Image Workbench
Replies: 4
Views: 160

Re: Scaling in the Image Workbench

... scaling pictures is rather empirical by making an overlay sketch to get distances.
Calculate the scaling factor and multiply XSize and YSize with it.

ScalePNG.PNG
ScalePNG.PNG (69.09 KiB) Viewed 108 times

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