Applying the Draft operation in Part Design WB removes a face.

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PeterVG
Posts: 7
Joined: Thu Nov 11, 2021 10:48 am

Applying the Draft operation in Part Design WB removes a face.

Post by PeterVG »

Cut_Grip.FCStd
Cut Grip
(29.59 KiB) Downloaded 12 times
OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: Dutch/Belgium (nl_BE)

See attached project file. All operations are done in the Part Design WB in order to make use of the Draft operation (see screen print 3).

Screen print 1: 2 sketches. Sketch 1, the one with the drill hole, is in the YZ plane and symmetrically padded. Sketch 2 is in the XY plane and padded normally.

Screen print 2: boolean cut operation

Screen print 3: result after the Draft operation (reverse pull direction checked) on both sides. This side is OK.

Screen print 4: the other side is not OK. The face has disappeared and the drill hole has been closed.

It would be great if someone could contribute to one of the following questions:
1) Is the disappearance of the face due to wrong manipulation? What would be the correct approach?
2) Is there an alternative operation in other WB's?
3) Keep it as is but restore the face (and open the drill hole). How do I do this.

Thanks.
PeterVG
Posts: 7
Joined: Thu Nov 11, 2021 10:48 am

Re: Applying the Draft operation in Part Design WB removes a face.

Post by PeterVG »

Initial Situation
Initial Situation
ScreenPrint01.png (171.69 KiB) Viewed 718 times
Cut Operation
Cut Operation
ScreenPrint02.png (177.92 KiB) Viewed 718 times
OK
OK
ScreenPrint03.png (327.4 KiB) Viewed 701 times
NOK
NOK
ScreenPrint04.png (317.77 KiB) Viewed 718 times
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Shalmeneser
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Re: Applying the Draft operation in Part Design WB removes a face.

Post by Shalmeneser »

* Boolean ???
* PartDesign_Draft is prone to problem
Attachments
Cut_Grip_SHALM.FCStd
(18.59 KiB) Downloaded 17 times
Capture.PNG
Capture.PNG (18.07 KiB) Viewed 691 times
chrisb
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Re: Applying the Draft operation in Part Design WB removes a face.

Post by chrisb »

Draft is problematic with holes. You could make the draft before making the hole with another pocket though. Draft is still affected by the topological naming problem, so it is better to use a pocket instead. It is recommended anyway to use the simplest tool possible, and the simplest PartDesign features are Pads and Pockets.

Edit: Added the file.
Attachments
Cut_Grip_cb.FCStd
(21.05 KiB) Downloaded 12 times
SnipScreenshot-2b185d.png
SnipScreenshot-2b185d.png (7.04 KiB) Viewed 668 times
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PeterVG
Posts: 7
Joined: Thu Nov 11, 2021 10:48 am

Re: Applying the Draft operation in Part Design WB removes a face.

Post by PeterVG »

Hello Shalmeneser,

Thank you for your attachment. I studied it. The Pocket operation works much nicer than the boolean Cut. Thanks for the tip.

The screen print shows 2 objects from a much bigger project where the Part Design WB Draft operation has been successful. So I didn't expect a problem in using the Draft once more.
I don't understand the triangle like lines in your screen print. Can you please explain what you did to succeed in drafting both faces?
Probably due to the Pocket operation the Draft operation doesn't work at all on your file/object.

Thank you.

Successful Draft operation
Successful Draft operation
ScreenPrint05.png (106.63 KiB) Viewed 665 times
PeterVG
Posts: 7
Joined: Thu Nov 11, 2021 10:48 am

Re: Applying the Draft operation in Part Design WB removes a face.

Post by PeterVG »

Hello chrisb,

Thank you. I studied your file. Very nice solution indeed!
You are right about the holes. Without holes the Draft operation works fine.
It is bizarre though that in my big project the Draft works as expected, including the holes (see screen print previous post). Maybe it is because these objects were in the XY plane whereas here it is in the YZ plane.

Thanks.

Without drill holes
Without drill holes
ScreenPrint06.png (178.23 KiB) Viewed 645 times
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Shalmeneser
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Re: Applying the Draft operation in Part Design WB removes a face.

Post by Shalmeneser »

PeterVG wrote: Fri Nov 26, 2021 12:24 pm The Pocket operation works much nicer than the boolean Cut. Thanks for the tip.
Boolean operations are seldom used.
.
.
I don't understand the triangle like lines in your screen print. Can you please explain what you did to succeed in drafting both faces?
The lines are from the sketch (select and space-bar to show).
I've done the same than ChrisB but in 2 sketches (not wanting to modify too much your sketch).
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Shalmeneser
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Re: Applying the Draft operation in Part Design WB removes a face.

Post by Shalmeneser »

:oops: I've downloaded the bad file !
Here the right file.
Attachments
Cut_Grip_SHALM.FCStd
(30.97 KiB) Downloaded 11 times
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