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AutoCAD problem with getting an arc where I want it.

Anonymous

AutoCAD problem with getting an arc where I want it.

Anonymous
No aplicable

I've attached a screenshot with this post. I'm trying to get the selected arc to begin at the point marked with an X on the vertical line. It needs t be a specific radius, but I do not have a location for the midpoint of the arc to go by. Instead, I need a specific radius with the arc running tangent to the circle on the left. In other words, I need the arc to begin at the X and end tangent to the circle at a specific radius.

 

The problem I am having is that I cannot seem to make the arc tangental to the circle. Does anyone have any suggestions?

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4 Respuestas
Respuestas (4)

Anonymous
No aplicable

Hello,

      Maybe you can try the CIRCLE tool TAN, TAN, RADIUS then TRIM the circle to an arc.  Or OSNAP TANGENT by pressing SHIFT and RIGHTCLICK with an ARC selected may also do the trick.

Dave B.

Arc.png

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Anonymous
No aplicable

Unfortunately I've tried both of those tecniques. The radius I need is 1.1875 in. It needs to intersect with the X. The problem I have is that I do not know the location of the midpoint of the circle or arc. The mid point would depend on the tangental point on the circle already drawn. When I use O-snap, the arc or circle snap to the bottom of the circle for some reason. Tan Tan Radius does the same thing. Any othe suggestions?

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JDMather
Consultant
Consultant

Attach your *.dwg file here and end all doubt.


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Autodesk Inventor 2019 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional


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Kent1Cooper
Consultant
Consultant

See the image.  The white Circle and Line and X along the Line are your initial fixed elements.

 

ArcTanentPt.png

 

Draw a Circle [the green one] with the 2P option, with the 1st point being the left quadrant point of the white Circle, and the 2nd point to the right of there by [since the 2P option defines a diameter] twice your specific radius.  The desired-result Arc will be a portion of that green Circle.  You're going to rotate the green Circle with the center of the white Circle as the rotation base point, so that at any rotation, it will always be tangent to the white Circle.

 

To determine the rotation:  Draw a Circle [the yellow one] with its center at the center of the white Circle, and going through the X spotRotate the green Circle, giving it the center of the white Circle as the rotation base, and using the Reference-direction option.  For the Reference [starting] direction, use from the center of the white Circle to the intersection of the yellow and green Circles [the blue Line], and for the new direction, the X spot [the magenta Line].

 

Use the white Circle and Line as trimming boundaries to Trim the rotated green Circle to the desired-result Arc [the red one].

Kent Cooper, AIA