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Making angles same
rune_thorsen
Member Posts: 7 ✭
Hi, as a newbie I can't figure out how to constrain two (or more) angles to be equale.
E.G. I have an angle set to 12 degrees. I want to constrain other angles to be identical so if I change the 'master' angle to 10 degrees they will follow and become 10 degrees. (Not having to change manually all values)
E.G. I have an angle set to 12 degrees. I want to constrain other angles to be identical so if I change the 'master' angle to 10 degrees they will follow and become 10 degrees. (Not having to change manually all values)
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Best Answers
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RK
OS Professional Posts: 16 PRO
You can use variables to define the angle and then use that variable whenever you dimension an angle. This is a link for webinar on variables: https://www.onshape.com/videos/webinar-variables-in-onshape-july-19-2016.
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RK
OS Professional Posts: 16 PRO
You can set lines as equal because they are entities you can pick. Angle is not an entity by itself, it is only a measurement between 2 entities. Therefore, to set angles as equal, we need dimensions. Variables & equations are very handy when you have to deal with dimensions.
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Answers
What I expected to set angle dimensions as driven and be able to apply an equal constraint among them.
Conclusion, you have to workaround not being able to set angles to equal as you would set line lengths to equal.
At the risk of kicking a dead thread…
Draw two centerpoint arcs where you would expect the angular dimension callouts to be. Set them as 'construction', then set their radii equal to each other. Draw construction lines between the endpoints of each of these arcs, then set their length equal to each other. you now have two equal-radius arcs with equal distances between their endpoints, thus their angles will be equal.
If you have right angled triangles then you only need to create a perpendicular segment that's connects to the hypotenuse and is the same distance from the point of the angle you're trying to make equal on both triangles. In this example the triangle on the left has the shorter of two opposite edges so the measurement is from the angle (the top point of the triangle) to the right angle. On the right-hand triangle you see an additional construction line that is the same distance down from the top angle's point. You make those lines (in this case I needed to draw a second construction line from the angle to the vertex of the perpendicular line) euqal with one another and then you make the length of those perpendicular lines an equal constraint as well. This forces the angles to be the same.