Trying to get my head around datum planes. I have created two one normal and is positioned along the mid point of the cylinder, the centred along the axis of origin of the cylinder circumference.
I am trying to use a subtractive primitive to remove a section of the cylinder based on these two datum plane however the result if not what I am expecting and appears to remove the whole cylinder, not just a 100mm section using the 100mm subrtractive cube used.
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13509 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 0258808ccb6ba3bd5ea9312f79cd023f1a8671b7
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/Australia (en_AU)
Self centre a primitive to a Datum Plane
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Self centre a primitive to a Datum Plane
- Attachments
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- datum_use3.png (131.59 KiB) Viewed 1870 times
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- datum_use1.png (244.08 KiB) Viewed 1873 times
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- datum_use.png (180.44 KiB) Viewed 1873 times
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- datum_use.FCStd
- (11.14 KiB) Downloaded 67 times
Re: Self centre a primitive to a Datum Plane
I have problems editing/viewing your model, exact analysis has to follow. Here my guess:
The subtracitive box has no connection to the DatumPlanes, so you don't need them.
The box cuts a piece in the middle of your pad, which would yield two solids. This is not allowed in PartDesign, so one of them is suppressed.
The subtracitive box has no connection to the DatumPlanes, so you don't need them.
The box cuts a piece in the middle of your pad, which would yield two solids. This is not allowed in PartDesign, so one of them is suppressed.
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Re: Self centre a primitive to a Datum Plane
"The box cuts a piece in the middle of your pad, which would yield two solids. This is not allowed in PartDesign, so one of them is suppressed."chrisb wrote: ↑Sun Apr 22, 2018 9:36 am I have problems editing/viewing your model, exact analysis has to follow. Here my guess:
The subtracitive box has no connection to the DatumPlanes, so you don't need them.
The box cuts a piece in the middle of your pad, which would yield two solids. This is not allowed in PartDesign, so one of them is suppressed.
I think this may be my problem. I did not know that PartDesign doesn't allow two solids
I'm a little unsure what you mean by "The subtracitive box has no connection to the DatumPlanes, so you don't need them."
When I created the subrtactive box I chose to use attachment to DatumPlane and DatumPlane001?
Re: Self centre a primitive to a Datum Plane
Ok, I see. I had problems with viewing the details of your file and still have them when I try to change something.
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DeepSOIC
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Re: Self centre a primitive to a Datum Plane
I have them too.
There is something horrily broken about Box:
Code: Select all
>>> App.ActiveDocument.Box.Placement
Placement [Pos=(-2.5e+099,-5e+099,-2.5e+099), Yaw-Pitch-Roll=(153.435,-3.18055e-015,65.9052)]
EDIT: Ah, I see how. It happens when you use Inertial CS attachment on datum plane. Datum plane is internally infinite, and this bogus result is the outcome.
Re: Self centre a primitive to a Datum Plane
Ok NormanC , thank you will do so.
Re: Self centre a primitive to a Datum Plane
The Download page refers to 0.17.13519. Also, the linux appimage is still at .13509. Is that correct?
Re: Self centre a primitive to a Datum Plane
Both are correct. Three days ago Normand was correct as well.
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