Longitudinal cut in rotational shape

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Milos
Posts: 9
Joined: Wed Nov 24, 2021 11:20 am

Longitudinal cut in rotational shape

Post by Milos »

I am a complete beginner working with FreeCAD. I need to design a guide wheel for the old dishwasher (no spare part available). Creating a basic rotary shape was not a problem. I created a 2D model and let this shape rotate. But I would need to cut longitudinal slits in this unit at 60 degrees. What is the optimal procedure?
TIA
Milos
TheMarkster
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Re: Longitudinal cut in rotational shape

Post by TheMarkster »

Now that your first post has been approved you may attach your file and images showing the part you wish to create. Longitudinal cuts in a rotational shape isn't really good enough as a description, at least not for me.
Milos
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Joined: Wed Nov 24, 2021 11:20 am

Re: Longitudinal cut in rotational shape

Post by Milos »

Thanks for your reply. I have included hand sketch of final shape. In red are cuts in rotational part that I aim at. Real dimensions of the wheel before cuts are in FCStd file (also included).
TIA
Milos
Attachments
KOLECKO_SE_ZLABKEM_ROTACE.FCStd
(16.02 KiB) Downloaded 17 times
WHEEL_DISHMACHINE.pdf
(239.85 KiB) Downloaded 28 times
TheMarkster
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Re: Longitudinal cut in rotational shape

Post by TheMarkster »

Make a sketch on the xy plane with a rectangle for the cut and do a pocket. Just do one of them. Then select the pocket and make a polar pattern with 6 elements.
Snip macro screenshot-c6a690.png
Snip macro screenshot-c6a690.png (78.36 KiB) Viewed 1671 times
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Shalmeneser
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Re: Longitudinal cut in rotational shape

Post by Shalmeneser »

:idea:
Attachments
KOLECKO_SE_ZLABKEM_ROTACE_SHALM.FCStd
(16.47 KiB) Downloaded 18 times
Milos
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Joined: Wed Nov 24, 2021 11:20 am

Re: Longitudinal cut in rotational shape

Post by Milos »

Thanks for the hint. However I have more basic problem:
I have created Datum Plane and put an rectangle on it. I cannot set active corner points either for their invisibility or after tilting the plane I can see all edges and red points in cornes without making the points "active" (green) for setting dimensions and symmetry. Neither works an alternative when I created in sketch an rectagle on xy (z=0) - I can see the rectagle in the hole only.

I have played number of tutorials, but the majority of them were leaving fine control behind the scene (I have "retrieved" click "m" for changing the shape in multiline, spacebar for hiding,... )

Sorry for very basic details, but without "fine grained" info I could not find the proper path.

TIA
Miloš
Attachments
HIDDEN_RECTANGLE.jpg
HIDDEN_RECTANGLE.jpg (88.95 KiB) Viewed 1491 times
chrisb
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Re: Longitudinal cut in rotational shape

Post by chrisb »

A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
Milos
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Joined: Wed Nov 24, 2021 11:20 am

Re: Longitudinal cut in rotational shape

Post by Milos »

I have created final shape as depicted in picture FINAL_SHAPE.jpg (included). However there are some remnants from original 2D boundary and DatumPlane. Are these relevant in preparation for printing (slising)? How can I rid off these part of design? I am including the FCStd file for more details (KOLECKO_SE_ZAREZY_F.FCStd).
Is there any procedure how to validate final model?

TIA
Miloš
Attachments
KOLECKO_SE_ZAREZY_F.FCStd
(96.19 KiB) Downloaded 19 times
FINAL_SHAPE.jpg
FINAL_SHAPE.jpg (45.49 KiB) Viewed 1399 times
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Shalmeneser
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Re: Longitudinal cut in rotational shape

Post by Shalmeneser »

Your DatumPlane has neither Map Mode nor Support. (so it is not just on the face !)

Seam line is normal.
Attachments
Capture du 2021-11-29 22-59-41.png
Capture du 2021-11-29 22-59-41.png (30.68 KiB) Viewed 1371 times
KOLECKO_SE_ZAREZY_F_SHALM.FCStd
(47.26 KiB) Downloaded 13 times
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Shalmeneser
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Re: Longitudinal cut in rotational shape

Post by Shalmeneser »

:idea:
Attachments
KOLECKO_SE_ZAREZY_F_SHALMv2.FCStd
(54.93 KiB) Downloaded 16 times
Capture du 2021-11-29 23-12-53.png
Capture du 2021-11-29 23-12-53.png (27.2 KiB) Viewed 1356 times
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