How to draw these circles

[jeffK9B4B]

Morning all

For the sake of not going mad, can someone please assist me with this exercise?

I only have one dimension, and its driving me banana's trying to work out how to do the intersect points and dimension it up.

it looks like an eclipse with 7 points of intersection from the circles.

Any advise greatly appreciated.

Kind Regards

JM

[leeminardi · Accepted solution]

There are several ways to create the shape.  I think the easiest is to create an arc or circle and polar array it for 7 items.

Use rotate or align to get one of the lobes straight down. Trim as necessary and measure the distance that needs to be 100 and use the actual value to determine a scale factor and  then scale the geometry.

[imadHabash · Accepted solution]

Hi,

Click on below image to see how exact you can draw 7 attached tangent circles to get 7 petals.I used commands ( Array (Polar) / Draw Circle / Explode / Extrim / Scale (Reference) and Dimension )

[Kent1Cooper · Accepted solution]

This was my approach:
Draw a 7-sided POLYGON [red] of any size with a horizontal edge at the top [several ways to accomplish that], and two horizontal LINEs [magenta] off two of its corners:

SCALE the arrangement using the Reference option -- the Reference distance is the distance between the magenta Lines, and the target distance is your 100 units.  ERASE the magenta Lines.  Draw two LINEs [green] between opposite midpoints and corners.

Draw a CIRCLE [yellow] using the Tangent/tangent/radius option, tangent to the green Lines, and at any radius [this happens to be 50 units].

Draw a LINE [white] from point A to point B, and EXTEND it if necessary to point C on the yellow Circle [if the Circle is smaller, that Line's outer intersection with it is point C].

SCALE the Circle, using point A as the base, and again with the Reference option -- A to C is the Reference distance, A to B is the target:

TRIM the outboard part off the yellow Circle; ARRAY the resulting Arc in Polar fashion 7 times around point A; draw a CIRCLE [cyan] centered at point A with its radius taken PERrpendicular to any of the yellow Arcs; ERASE the white and green lines and the red Polygon.

[richard_387 · Accepted solution]

I also started with a seven sided polygon, scaled to suit the given dimension.

I then drew a perpendicular bisector to one side. I then drew a circle, using the three point option, through each end of one of the sides and tangential to perpendicular bisector. I drew the rest of the circles using the circle just drawn as the tangent point.

The central circle I also drew with the 3 point option.

[Washingtonn · Accepted solution]

Another method - scaling using the ALIGN commend.

[dbroad]

My take:  1) Draw circle. 2) Polar array circle.  3)Draw line from array center. 4)Edit array (size part and trim). 5)Erase line. 6)Draw center circle.  7)Draw line for reference scaling. 8)Reference scale.