Hi

I am trying to find equation for the radius for the arcs in the drawing(all arcs have equal radius). I also require an equation to work out half the chord length of the first arc. The height of the arc are fixed at 120mm. The first and and third arcs are both tangent to the second arc.

I am trying to machine this pattern on a CNC and require it parametric. So the machine will work out the pattern if the length changes.

Thanks in advance

Liam