[solved] Correct way to make this Arc

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slyde
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Posts: 68
Joined: Sat Nov 18, 2017 2:37 am
Location: Turnip City, Texas

[solved] Correct way to make this Arc

Hi Forum:

I came across some CAD exercises the other day. Being new to CAD, this made me happy. But last night one of them got me. Last piece of the puzzle too! It was a 20 degrees radius arc. I tried all of the arc tools and cldnt make it work. What I ended up doing was making a 20 degrees radius circle and eyeballing it in place, then trimming it. And that's not the way to do it. But I can't figure out how to achieve this arc.

Here's a pic of the exercise, followed by what I did.
Screenshot from 2017-12-09 23-02-15.png (185.38 KiB) Viewed 1188 times
Screenshot from 2017-12-10 07-45-46.png (16.33 KiB) Viewed 1186 times
I'd appreciate someone showing me how to draw in this arc the right way. Thanks.

Slyde
Attachments
ex-5.dxf
Last edited by slyde on Sun Dec 10, 2017 3:49 pm, edited 1 time in total.
Look! It's a bird. No! It's a plane! NO! It's QCAD hotkeys...faster than a possum falling out of a tree!!

OS: Linux Mint 18.3 Sylvia [64-bit]

Clive
Moderator / Drawing Help
Posts: 1329
Joined: Thu Aug 25, 2011 9:28 pm
Location: UK

Re: Correct way to make this Arc

Always look and work with all the geometry information given, in this case circles.

Run the tool and choose the correct circle you need, then break out/trim to suit.
2 Tangents and Radius.jpg (52.99 KiB) Viewed 1182 times

slyde
Full Member
Posts: 68
Joined: Sat Nov 18, 2017 2:37 am
Location: Turnip City, Texas

Re: Correct way to make this Arc

Thank you, Clive. Next cup of coffee's on me
Screenshot from 2017-12-10 08-47-33.png (212.15 KiB) Viewed 1176 times
Slyde
Look! It's a bird. No! It's a plane! NO! It's QCAD hotkeys...faster than a possum falling out of a tree!!

OS: Linux Mint 18.3 Sylvia [64-bit]

Clive
Moderator / Drawing Help
Posts: 1329
Joined: Thu Aug 25, 2011 9:28 pm
Location: UK

Re: [solved] Correct way to make this Arc

Thanks Slyde.

Try these when you have time.
EXERCISE 1.jpg (88.63 KiB) Viewed 1173 times
EXERCISE 2.jpg (111.38 KiB) Viewed 1173 times
EXERCISE 3.jpg (84.33 KiB) Viewed 1173 times
EXERCISE 4.jpg (118.48 KiB) Viewed 1173 times