An arc of specific lenght.

[Anonymous]

Hi,

the following problem: i'm drawing an arc and i have to specify the lenght not the arc angle. How to do it?

[TheCADWhisperer]

Are you familiar with using Parameters?

What is your intended Arc_length?

What is your intended Arc_radius?

[HughesTooling]

You can use radians to calculate the length with (ArcLengh/ArcRad)*rad, units for the parameter need to be degrees. One warning, Fusion has a nasty bug if you use a parameter drive an angle dimension in a sketch. If you modify the angle from say 45° past 180° the dimension flips, now if you try going back to 45° the angle will be 180° out, see screencast below.

Mark

[Anonymous]

Thank you for the tip. I have to say that this is not an easy way:) I can see the area for improvement here: while drawing the arc a pop menu can appear and one can choose the way the arc is created. Could you put it to the "to do list"? 

[HughesTooling]

@Anonymous There are several on the ideastation for arc length and for splines. Here's one you can vote up.

Mark

[JDMather]

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@Anonymous wrote:

.... I have to say that this is not an easy way...

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Full featured professional design programs like Autodesk Inventor or SolidWorks have this functionality built in.

If you are a student - you can download Autodesk Inventor Professional from http://www.autodesk.com/edcommunity for FREE.

[Anonymous]

Yeah i know Inventor exists but as i'm not a student its price is waaaaaay too high for people like me - i'm using it for personal purpouses only i my home shop.

You said that pro CAD software have the ability in question built in. To be honest we are not talking about rocket science here:) It is VERY SIMPLE tool and it seems VERY BASIC. So IMHO "buy Inventor or Solidworks" argument is strange:)