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Draw Negative of Arc?


CraigC

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If this is 2D (and maybe even 3D), you can use the Fillet tool.

 

Alternatively,  do a 2-step process to make a "cutting shape".  Since the positive arc is much easier to draw, Draw a slightly bigger than needed square or rectangle and draw the arc on top. Select both and Clip Surface. This will give you the "negative" shape you are looking for. Place this shape over your rafter and Clip Surface again (if you have more than one, you probably want to duplicate your "cutting shape" first so you don't have to recreate it).

 

If you are in 3D, you can do basically the same thing, but after you make the negative shape, extrude it. You can make it way over length so it is easier to align with your 3D rafter. Then select the 3D cutting shape and the rafter and Subtract Solids.

 

And there are probably several other easier ways that I am not thinking of right now.

 

Ask again if these are not clear enough.

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Craig,

   Alternately, you can use the Reshape Tool, 3rd option - Change Vertex Mode, assuming as Pat did that this is a 2D Polygon.

 

1) Select the polygon, and double click on the Reshape Tool. This opens up the Fillet Settings dialogue box. (You can also click on the last icon on the far right – Reshape Tool Preferences.)  Set the radius to the width of your rafter. 

2082062682_ReshapeToolicon.thumb.png.3a42663f83fee722ad81f08f69f7f13f.png      801100081_FilletSettings.thumb.png.0a50c38f9d14134f476d8cbd7d1af8a0.png

 

2) Select the Change Vertex Mode (1st group), and the Fillet (Circular Arc) Point Mode (2nd group).

573686813_ReshapeToolOptions.thumb.png.d1c464a58a92afe09552063c4311f194.png

 

3) Click on the vertex to modify. In your example, it's the lower left vertex. (Ignore my units, it's just an example. Use your rafter width instead.)

Rafter.thumb.png.b37dad80272e38a0b035c4d393b0aa5f.png

 

 

Pat's right, there are other ways, but easier is a judgement call. Pick one you like and keep going. 

 

HTH,

Raymond

 

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