topic Re: placing an arc in AutoCAD Forum

placing an arc

Anonymous — Fri, 05 Oct 2018 13:55:10 GMT

I want to place an arc tangent to a circle, touch the endpoint of a line and specify the radius. I cannot figure out how to do so. Can anyone help?

Re: placing an arc

GrantsPirate — Fri, 05 Oct 2018 14:24:58 GMT

"A picture is worth a 1000 words." Post what you have so the solutions you get will make sense.

Re: placing an arc

dbroad — Fri, 05 Oct 2018 15:03:48 GMT

Won't fillet work?

Re: placing an arc

Anonymous — Fri, 05 Oct 2018 15:19:36 GMT

nope.

Re: placing an arc

Kent1Cooper — Fri, 05 Oct 2018 15:58:35 GMT

In this illustration, the original Circle and Line are in white. Draw a Circle using the TTR option, tangent to the original Circle and Line and at your desired radius [dashed yellow]. Offset the original Circle using the Through option, through the desired endpoint of the Line [dashed blue]. Rotate the [dashed] yellow Circle about the Center of the white Circle, using the Reference option, with the Reference direction being dashed green [to the intersection of Offset dashed-blue Circle and TTR dashed-yellow Circle], and the new direction being the cyan [to the desired endpoint of the Line] -- solid yellow is the resulting position. Trim the solid yellow Circle to an Arc as appropriate.

Re: placing an arc

Anonymous — Thu, 11 Oct 2018 13:30:56 GMT

Please try this attachment. I am new to this and dont know how to take a screenshot. Sorry for the delay.

Re: placing an arc

leeminardi — Thu, 11 Oct 2018 14:23:21 GMT

Let's assume the radius of the arc you want to create is R. Given the white circle and line create a concentric circle with a radius of the white circle + R yielding the red circle.

Create a circle of radius R at the end of the line (green circle).

Create a circle centered at the intersection of the red and green circles yielding the yellow circle and trim.

Note, there are two solutions represented by the two intersections of the red and green circles.

BTW, To do a screen capture you can use the Print Screen button on your keyboard to capture the entire screen or Alt-Print Screen to capture the active window. Better yet is to use the Windows 10 Snipping Tool. Just do a search for it.

Re: placing an arc

Anonymous — Thu, 11 Oct 2018 15:09:18 GMT

Thank You, that did it.