Hi @luizdecastro1981,

If the angular division of the big circle is 1.5 degrees the the angular division of the small one should be 4.5 degrees. But you don’t need to plot so many points. I did it with an angle of 4 degrees on the large circle and 12 degrees on the small one.

Once divided, here’s what I did:

**Group** the small circle, its dividing lines and its point.

If a line

*a* is aligned with line

*b*, then

**move** the small circle, from

*c*, to

*d*. You may need to zoom in and you will need to use

**osnaps** to the end of each line.

**Rotate** the small circle, with the rotation centre at

*d* and entering an angle of 16 degrees (i.e. the sum of the division angles 4 and 12), so as to align line

*e* with line

*f*.

Place a new

**point** at the position of the grouped point, again using osnaps (to the point).

Repeat until you have all points then use

**Curve through points** (_CurveThruPt) to draw the epitrochoid through them.

Epitrochoid3.3dm (85.6 KB)

Regards

Jeremy