Polar pattern?

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chris s
Posts: 17
Joined: Mon Mar 06, 2017 1:23 pm

Polar pattern?

Postby chris s » Tue May 08, 2018 9:34 pm

I have a part which I want to replicate as a polar pattern, but as it is not a feature on a part I cant use the polar pattern feature or can I?

The part profile was sketched in the YZ plane, then made into a pad. Then I want to replicate it 8 times around the Z axis but cannot find any way to do it.
schupin
Posts: 294
Joined: Sun Jan 21, 2018 1:43 pm

Re: Polar pattern?

Postby schupin » Tue May 08, 2018 9:50 pm

You can certainly do it with the "array" tool in the draft workbench.
dbecad
Posts: 80
Joined: Fri Mar 16, 2018 11:10 pm

Re: Polar pattern?

Postby dbecad » Wed May 09, 2018 12:40 am

chris s wrote:
Tue May 08, 2018 9:34 pm
I have a part which I want to replicate as a polar pattern, but as it is not a feature on a part I cant use the polar pattern feature or can I?
Good day Chris,

That's a good question, I've had various degree of success trying to create a solid from a radial pattern of shapes that should result in a solid. I think the problem is that the Part-design WP tool does not work very well with parallel faces and it will let you do it some time but not consistently. A way to do it is, if you can model the whole external shape first, then carve the repeated holes inside, it should work.

The doc for the tool refers the this limitation on the mirrored feature (https://www.freecadweb.org/wiki/PartDesign_Mirrored)
The Mirrored feature cannot mirror a whole solid body.
It's regrettable that we have to use a tool from another WB and create a mess in the object tree when it would be so nice to just stay in the part-design workflow and have a single body.

Edit:
I made a small test and the polar pattern worked on the whole body. You can change the number of slice from the spreadsheet and the sketch & pattern will follow. So I guess you can try it?

Cheers

====

OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13509 (Git)
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jmaustpc
Posts: 9558
Joined: Tue Jul 26, 2011 6:28 am
Location: Australia

Re: Polar pattern?

Postby jmaustpc » Wed May 09, 2018 3:25 am

chris s wrote:
Tue May 08, 2018 9:34 pm
I have a part which I want to replicate as a polar pattern, but as it is not a feature on a part I cant use the polar pattern feature or can I?

The part profile was sketched in the YZ plane, then made into a pad. Then I want to replicate it 8 times around the Z axis but cannot find any way to do it.
Its really simple, and has been asked numerous times, the intent/purpose of PartDesign WB is to make only single contiguous solids. In the long term the official Assembly workbench would be then used on that solid for things like an Array. However the official Assembly WB does not yet exist.

For an array of a feature of a single solid, you can use PartDesign Pattern features. For example, a pattern of holes in a flange.

For an Array of non-overlapping individual solids, use Draft WB Array tool. If the Array of solids overlap each other then you can set the Draft Array Fuse property to "true" so that the output would be a valid single solid.