I am a figurative marble sculptor. I have been using the Cuturi air hammer line for 20 years. I learned about it from the 70-year-old artisani in Italy who have been sculpting for major studios all their lives.* They use Cuturi because they stand up to 40 hour weeks, for decades. So, that’s what I got. I have tried some others, and they worked OK, but nothing was better and it has withstood the test of time since I have been using mine for a long time.
Cuturi air hammers come in different sizes (different size pistons) and two types. The roughing hammers take larger chisels shaft diameters. The finish hammers take smaller chisel shaft diameters. Depending on your needs, you will probably want a large, medium, and small hammer for roughing, and then a medium and small for finish work. If you don’t use a diamond bladed saw for the initial stage of the rough (getting rid of big chunks of stone), you may want the largest air hammer for your initial rough but it’s very heavy and exhausting to use.
Generally, I use carbide tipped chisels which can be purchased commercially. However, for finish work, the last two finishing stages are done with chisels made by a blacksmith out of steel. (The retired Italian blacksmith who made my set of steels complained that he has a hard time finding quality steel for chisels anymore.) The carbides are sharpened on a grinder. The steels are sharpened on a stone. (Nothing fancy, a nearby flat rock will do.) The roughing Cuturi hammers are best with carbide chisels. The larger finishing hammer can use both. The smaller finishing hammer is only used with steel.
You can see examples of my work.
*Sadly, when you buy a marble sculpture by a famous artist, it is not unlikely that they have never touched the stone. They send a model to one of the major studios in Pietrasanta, Italy and the artisani there copy the model into stone, often enlarging it and adding important details. Sometimes they just get a hand sketch or a short description to work from. They get paid a fairly low hourly wage, then the sculpture gets crated by a guy who has been doing it all his life, shipped to a New York gallery, and someone pays six figures for it.