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clarkwr1  
#1 Posted : Thursday, July 20, 2017 7:20:13 AM(UTC)
clarkwr1

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How do you draw this arc.
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jdi000  
#2 Posted : Thursday, July 20, 2017 7:38:12 AM(UTC)
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Hello

Are you tracing this from a picture or do you have dimensions available?

Regards

Jason
Windows 10, Win 7
clarkwr1  
#3 Posted : Thursday, July 20, 2017 8:09:05 AM(UTC)
clarkwr1

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the dimensions don't really matter. Just draw two circles and try to get the tangent arc to go to the outside as depicted.
L. Banasky  
#4 Posted : Thursday, July 20, 2017 12:39:49 PM(UTC)
L. Banasky

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I don't really know an easy way in ViaCad. We need to add tan,tan,radius to the circle menu
for our Wish List. AutoCAD has had it for decades.
For your drawing I would trace and scale a known dimension.
I know this video won't help, but shows tan,tan, radius.

http://www.screencast.com/t/UqK0rJWTCYx

Here's a link to a traced arc.

http://www.screencast.com/t/N6Sg6Fpqp8


Larry

Edited by user Thursday, July 20, 2017 1:14:32 PM(UTC)  | Reason: Not specified

rokoko  
#5 Posted : Thursday, July 20, 2017 1:30:44 PM(UTC)
rokoko

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you can try a solution with one guide line and the three tangent circle tool

finally you can trim the resulting circle

Edited by user Thursday, July 20, 2017 1:38:25 PM(UTC)  | Reason: Not specified

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viacad pro 10 powerpack, viacad pro 9 german, mac os 10.8, 10.9
24c  
#6 Posted : Friday, July 21, 2017 7:04:35 AM(UTC)
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..or you can use the Tangents Points Arc tool, twice over to do the same.

1. Draw two circles
2. Draw line, at a tangent off one of the circles, or either perpendicular from a radius
3. Use the Tangent arc tool and create an arc that meets virtually at a tangent on the second circle (I'm sure I can set this to snap by altering something in the preferences)

If you're not happy with this, then create a tangent line off the second circle and use the Tangent Points Arc tool to work back to the first one, and it'll be a little closer to a tangential curve.
Admittedly a fudge, and probably not quite precise enough, but it works OK for me.

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