[Feature Request] Radial array/polar pattern in Sketcher

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Darktrax
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Joined: Sun Oct 19, 2014 11:33 am

Re: [Feature Request] Radial array/polar pattern in Sketcher

Post by Darktrax »

My apologies that I reply to a thread that is months old.

I do perceive the need for a polar array feature withing the sketcher, if only to greatly ease the need to be making many separate repeats of a feature that will be given form when the sketch is padded.

Something as simple as a set of equally sized bolt holes around a common centre. One can laboriously define each hole, and position them. To some degree, one can save effort by making copies, and constraining symmetries. We know that once in the sketch, they instantly appear in the pad.

I am sure there are other ways, but I ran into a tangle of pockets (not wholly successful), and then I tried to make a boolean subtraction of a polar array of cylinders (to make holes), and then I decided I just did not know enough about how best to drive FreeCAD.

Appreciate the power of such a feature when one needs the polar pattern to be rotated some angle about the normal axis. or alter the polar radius. Positioning the holes individually is a chore, even with as few as three or four. The whole reason we have sketches is to be able to put stuff in them instead of having to make external temporary separate objects for boolean operations.

Draft Workbench has such a tool. Is this something one should use the Draft Workbench for?
Bance
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Re: [Feature Request] Radial array/polar pattern in Sketcher

Post by Bance »

Darktrax wrote: Sat Jul 02, 2022 3:28 pm Something as simple as a set of equally sized bolt holes around a common centre.
Make a sketch of one hole then pocket/hole it and use a polar pattern to repeat it.
drmacro
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Re: [Feature Request] Radial array/polar pattern in Sketcher

Post by drmacro »

Darktrax wrote: Sat Jul 02, 2022 3:28 pm ...
Something as simple as a set of equally sized bolt holes around a common centre. One can laboriously define each hole, and position them. To some degree, one can save effort by making copies, and constraining symmetries. We know that once in the sketch, they instantly appear in the pad.
...
In a sketch, it is far more efficient to create the lowest denominator of any symmetry. It is not only easier to view the sketch, but the constraint scheme is easier and faster. It also makes the sketch easier to maintain and update.

Once one part of the symmetry is sketched and then a Pad/Pocket/etc. is perfomed, then the Polar Pattern can be used.

chrisb recounted a lecture from his past: "Concerning usage of simple sketches, there was the 7-7-7 rule from an old Pro/E teacher, saying a sketch should either have 7 elements or have 7 dimensions or take 7 minutes to build."

;)
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."

My beginners, written treatise: Learning FreeCAD
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