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Concentric circles fillet
Hello.
Im new to Autocad.
Im trying to get an arc between some concentric circles.
I tried to use filler but i cant get it to put the arc where i want it..see picture
also i want the arc in the opposite direction so it points upwards not downwards
im not sure the best way to do this if anyone can make a suggestion would be much appreciated/
Thanks
Katelyn
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Hi,
can you please draw an arc manually without an exact FILLET at the position where you want to have it ... and then please upload the dwg-file. Within your screenshot we can't try anything ![]()
May first thought would be to try to start _CIRCLE ==> 2P and use object snap _TAN
- alfred -
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
------------------------------------------------------------------------------------
(not an Autodesk consultant)
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That's a curious situation. The resulting Arc will swing through a little more than 180 degrees, which I think is why Fillet won't put it in facing the way you want, even with a larger radius that would move it closer to where you want it.
FILLET as before, using increasingly larger radii [you may need to increase in very small increments] until you get the location relative to the two Circles where you want it. Then draw another ARC with the Center/Start/End option sequence, Osnapping to the Fillet-result Arc's center for the center of the new one, and its endpoints for the start and end. Erase the Fillet-result Arc.
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First off, the circles are not concentric. To be so they would all have their center points coincident.
Given two circles and a desired fillet radius there are potentially eight different arcs that could be added as a fillet between the two circles. The AutoCAD fillet command will only give you two of these. The circle TTR option (tangent- tangent-radius) will give you all eight.
The image below left shows the two results you can get with fillet. The right image shows the results with circle-TTR after trimming. I suggest you use circle -TTR and then trim to get the desired result.
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hi
thank you for your help.
I tried circle TTR and that seemed to work quite well.
I am trying to achieve the above drawing and still quite cant get it right.
Ive also uploaded the dwg file in my response above
any other suggestions would be great
Regards
Katelyn
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This drawing demos one possible procedure. See if it helps.
************************************************************
May your cursor always snap to the location intended.
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After calculating the circle diameters
5 circles on Construction
4 small circles on CirclesConst TTR Radius 12.5
Trim the CirclesConst to the circles to leave the arcs
MIRROR arcs to other side
BOUNDARY 8 times on Final layer
dave
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You can't use the mirror command on the circles as they are currently drawn because the center points aren't aligned vertically. The lower circle quadrant points aren't at the same coordinate either and I assume they are supposed to be.
Accuracy is important when learning CAD so turn on your OSNAPs if you aren't using them. I have End, Midpoint, Center, Node and Quadrant on all the time. I don't use Near very often since it is random and usually not where I want my placement and Perpendicular may also be near a point when I really want a different snap point.
Misaligned quadrants
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