Creation of spiral sketch to part

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holland237
Posts: 2
Joined: Mon May 29, 2023 8:12 am

Creation of spiral sketch to part

Post by holland237 »

Good morning,

I am trying to create a spiral part from a sketch, but seem to be doing something wrong since when i try to extrude my sketch it doesn't work. I've attached the software details and screenshot of what my sketch looks like - i'm trying to extrude this in the z-direction into a tube like part. I think it may be to do with the geometry being several lines, but i don't know- sometimes i receive the error 'wire is not closed'. I created my spiral 'sketch' in part>create primitives and then the spiral option, but i beleive i need to turn the lines into a suitable sketch before i can proceed. I receive the message ' selected object must belong to an active body - consider using a shapebinder', so i guess i must have to first create a body.....but i'd like to request some assistance on how do i access the option to sketch the spiral? In summary, i think i have some of these steps in the wrong order but can't figure out where i've gone wrong..... Thank you for any tips you can offer!

Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.2.29603 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United Kingdom (en_GB)
Attachments
Spiral sketch_290523.PNG
Spiral sketch_290523.PNG (32.71 KiB) Viewed 518 times
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NewJoker
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Posts: 3017
Joined: Sun Oct 11, 2020 7:49 pm

Re: Creation of spiral sketch to part

Post by NewJoker »

Can you share the .FCStd file ?
Bance
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Posts: 4186
Joined: Wed Feb 11, 2015 3:00 pm
Location: London

Re: Creation of spiral sketch to part

Post by Bance »

Is this what you are trying to do?
Attachments
overlap cyl.FCStd
(24.84 KiB) Downloaded 7 times
roll.png
roll.png (44.28 KiB) Viewed 491 times
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papyblaise
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Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: Creation of spiral sketch to part

Post by papyblaise »

it is a process worthy of alchemy:
you create your 2 concentric spirals, they are B-splines Draft Wb
you go to Draft Wb, you transform each spiral into a sketch with the tool provided for this purpose
you go to Sketch Wb and you fuse the 2 sketches
you go to PartDesign, create a body and slip this last sketch into it, you open it and close the 2 ends with a constrained line at the 2 ends to have a closed sketch
you can extrude (Pad)
Note, you can stay in Sketch Wb and extrude in Part Wb
Attachments
spiral pin.FCStd
(37.12 KiB) Downloaded 7 times
spiral pin.JPG
spiral pin.JPG (45.46 KiB) Viewed 463 times
holland237
Posts: 2
Joined: Mon May 29, 2023 8:12 am

Re: Creation of spiral sketch to part

Post by holland237 »

Wow...!
Thanks for the quick responses everyone! I've followed the steps and have created the part as you have it on your screens.....thanks again this is very helpful!
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