Get the X-Y and polar coordinates of every hole on a bolt circle from the diameter, number of holes, start angle and center — with a live plot. For CNC programming, layout and inspection.
X = Cx + (BCD/2)·cos θ, Y = Cy + (BCD/2)·sin θ, with θ stepping by 360°/N from the start angle. Angle is measured counter-clockwise from +X.