Recently I was asked if I could engrave some text into an old horseshoe. I would use a 3/8" solid carbide bevel end mill (about 120 degrees or so-makes nice engraved text) on my heavy duty Taig benchtop CNC mill. Overall depth would probably be no more than 0.050".
My main question is that I know that horseshoes are forged, not machined. What kind of steel are they made of and, more importantly, are they too hard to successfully machine/engrave? Does the forging process, particularly hand forging rather than drop forging, affect the hardness? I know they can be filed somewhat, but I would appreciate some advice from someone who has done/tried this or similar before.
Thanks in advance for any suggestions, woodworker88