100 cad exercises

[bejant]

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 (38.17 KiB) Viewed 324 times

^^I added a vertical dimension on the left because I couldn't create the angular dimension.

Screen grab and model:

page_69a.png (25.69 KiB) Viewed 324 times

page_69.fcstd

(49.83 KiB) Downloaded 13 times

OS: Ubuntu 18.04.1 LTS
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.18.14790 (Git)
Build type: Release
Branch: master
Hash: 3c048904ffa2372c4670344a33664764fce33fc8
Python version: 2.7.15rc1
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

[NormandC]

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.

^^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]

But, one thing to decide on: first angle or third angle projection?

I'm a North American so of course, first angle is ass-backward to me

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]

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.

[bejant]

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

[Hannu]

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.

[sgrogan]

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

[NormandC]

But, one thing to decide on: first angle or third angle projection?

I'm a North American so of course, first angle is ass-backward to me

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.

[wieszak17]

Two examples:
Page 73:

page73.png (35.63 KiB) Viewed 211 times

fcstd:

page73.fcstd

(48.42 KiB) Downloaded 16 times

Page 83: This is also example how to NOT do dimensions. And few are missing.

page83.png (43.33 KiB) Viewed 211 times

fcstd:

page83.fcstd

(179.37 KiB) Downloaded 12 times

[wieszak17]

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 (38.06 KiB) Viewed 207 times

fcstd:

page88.fcstd

(241.57 KiB) Downloaded 10 times

Page 97:

page97.png (27.65 KiB) Viewed 207 times

fcstd:

page97.fcstd

(41 KiB) Downloaded 11 times

OS: Linux
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.14573 (Git)
Build type: Unknown
Branch: master
Hash: fbcecfb139c5ef295e54ea3d6f19251f0baf0f8b
Python version: 2.7.13
Qt version: 4.8.7
Coin version: 3.1.3
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)