100 cad exercises

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bejant
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Re: 100 cad exercises

Postby bejant » Mon Sep 24, 2018 4:01 am

My version of Page 69 is attached, and I've corrected Page 68 version in my last post.

Question: in Tech Draw can I create an angular dimension as shown below:
Page_69.png
Page_69.png (38.17 KiB) Viewed 414 times
^^I added a vertical dimension on the left because I couldn't create the angular dimension.

Screen grab and model:
page_69a.png
page_69a.png (25.69 KiB) Viewed 414 times
page_69.fcstd
(49.83 KiB) Downloaded 18 times
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NormandC
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Re: 100 cad exercises

Postby NormandC » Mon Sep 24, 2018 4:22 am

bejant wrote:
Mon Sep 24, 2018 4:01 am
Question: in Tech Draw can I create an angular dimension as shown below:
Not that I know of. It requires selection of two edges that do not exist... Maybe we could request that it accept three vertices. Maybe first select two outside vertices, last selection to be the tip of the angle.

bejant wrote:
Mon Sep 24, 2018 4:01 am
^^I added a vertical dimension on the left because I couldn't create the angular dimension.
IMO it is a more logical dimension than the angle dimension. I imagine giving the original drawing to an old-school machinist to make the part, I'm willing to bet the very first question they'd ask would be, what's the distance from the Ø 45 mm hole to the top. A nice round 100 degree between side arcs would be meaningless to them. They'd prefer a nice round value for the horizontal dim to the hole! I would also dimension the centre of the side R20 arcs, possibly vertically and horizontally.

But I guess a machinist who works with modern CNC machinery would not mind about it, they'd use a CAM program to generate G-code and that would be it.
schupin
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Re: 100 cad exercises

Postby schupin » Mon Sep 24, 2018 11:16 am

NormandC wrote:
Sun Sep 23, 2018 8:04 pm
But, one thing to decide on: first angle or third angle projection? :twisted:

I'm a North American so of course, first angle is ass-backward to me :lol:
I'm not familiar with this kind of question at all...
I can read a drawing without problem but i'm not a professionnal draughtsman.

For this kind of project (.fcstd + drawings), it will be very important to have people who can control all the drawing to have well polished files.
chrisb
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Re: 100 cad exercises

Postby chrisb » Mon Sep 24, 2018 12:59 pm

schupin wrote:
Mon Sep 24, 2018 11:16 am
For this kind of project (.fcstd + drawings), it will be very important to have people who can control all the drawing to have well polished files.
Of course, but if it's all freely available it must not be perfect in the first go. The exercises are made as good as possible and the best will stay. Sometimes it sure is sensible to have different solutions of the same model.
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bejant
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Re: 100 cad exercises

Postby bejant » Mon Sep 24, 2018 3:12 pm

NormandC wrote:
Mon Sep 24, 2018 4:22 am

bejant wrote: Question: in Tech Draw can I create an angular dimension as shown below:
Not that I know of. It requires selection of two edges that do not exist... Maybe we could request that it accept three vertices.

I asked here:
https://forum.freecadweb.org/viewtopic. ... 86#p258286

and subsequently submitted issue #3613.

blue = edit
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Hannu
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Re: 100 cad exercises

Postby Hannu » Tue Sep 25, 2018 10:25 pm

https://www.dropbox.com/sh/tlrp9oz9vzkb ... gToTa?dl=0

That should be a link to a DropBox dir,
which contains 3D versions of the ten first 2D "drawings" in the 100 exercises book.
/Hannu - some knowledge in many fields ...
- computers, software, electronics, color correct photography,
- mechanics, 3D-printing, lathe, mill, weld -work,
- ISO9000, Deviations & Corrective actions, and a lot more...
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sgrogan
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Re: 100 cad exercises

Postby sgrogan » Tue Sep 25, 2018 10:40 pm

chrisb wrote:
Mon Sep 24, 2018 12:59 pm
Of course, but if it's all freely available it must not be perfect in the first go. The exercises are made as good as possible and the best will stay. Sometimes it sure is sensible to have different solutions of the same model.
Exactly! @WandererFan has been monitoring this thread and merging stuff with the repo https://github.com/FreeCAD/Examples/tre ... dExercises
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NormandC
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Re: 100 cad exercises

Postby NormandC » Sun Sep 30, 2018 8:31 am

schupin wrote:
Mon Sep 24, 2018 11:16 am
NormandC wrote:
Sun Sep 23, 2018 8:04 pm
But, one thing to decide on: first angle or third angle projection? :twisted:

I'm a North American so of course, first angle is ass-backward to me :lol:
I'm not familiar with this kind of question at all...
I can read a drawing without problem but i'm not a professionnal draughtsman.
First-angle projection (in French, called European projection) https://en.wikipedia.org/wiki/Multiview ... projection

Third-angle projection (in French, called American projection) https://en.wikipedia.org/wiki/Multiview ... projection

This can be a source of errors in interpretation, as the orthogonal views from the main view are totally reversed. Which is why a page template should always include the projection symbol to indicate which projection is used. The symbol represents a truncated cone viewed from the front and from the side.
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wieszak17
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Re: 100 cad exercises

Postby wieszak17 » Sun Sep 30, 2018 12:30 pm

Two examples:
Page 73:
page73.png
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fcstd:
page73.fcstd
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Page 83: This is also example how to NOT do dimensions. And few are missing.
page83.png
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fcstd:
page83.fcstd
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wieszak17
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Re: 100 cad exercises

Postby wieszak17 » Sun Sep 30, 2018 12:57 pm

ok, two next:
Page 88: (i need to cheat a little here - outer fillet caused CTD... cheat is in Sketch001 - 9.95mm instead of 10mm)
page88.png
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fcstd:
page88.fcstd
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Page 97:
page97.png
page97.png (27.65 KiB) Viewed 297 times
fcstd:
page97.fcstd
(41 KiB) Downloaded 15 times
OS: Linux
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