I just created a Solid using Solid > > Revolution. But I want each ring in my part to have an angle of 15 degrees with the horizon. How can I do this? Just note that I don't mean to rotate this spring 15 degrees.
Parham Pourzeynali To achieve a spiral where each ring forms a 15-degree angle with the horizontal in your 3D model, you need to adjust the pitch relative to the diameter. Imagine a point on the circumference of your spiral with a diameter and pitch. The relationship between the pitch and the diameter is such that the tangent of the angle (15 degrees) equals the pitch divided by twice the diameter. Using the tangent value for 15 degrees, which is approximately 0.2679, you can calculate the pitch as roughly 0.5358 times the diameter. Therefore, for a given diameter, the pitch should be 0.5358 times that diameter. By setting the pitch according to the above relationship, each ring in your spiral will have the desired 15-degree angle with the horizontal.