That is why I designed this one and had a machinist friend shape it on his CNC mill. The flat area on the base is great for flattening liners, springs, blades, etc. The beveled claw part was shaped to almost sharp and then a 30° angle was ground on the bottom side.
IIRC, the base is unhardened 4140 and the anvil part is O-1 at Rc50. Two socket screws hold it together.
Photo to show size:
I never built it, but planned on converting a claw-hammer to a cutler's anvil. It can be made from stuff laying around most every shop.
1) Get one the many old claw hammers laying around "somewhere" in the shop. You want one with a wooden handle. Remove the handle (if it even has one).
Find a block/plate/disc/piece of steel that weighs around 5 or so pounds. It can be anything from a cube to a barbell weight.
Find a piece of 1" round mild steel at least 6" long (any iron/steel round stock should work).
2) Anneal the head at 1400°F for 30 minutes and let air cool to black.
Grind/cut/shape/forge the old hammer head to get the flat surface, and shape desired
(NOTE: there is no need to remove the old hammer face end unless it creates a problem, or you want clean square corners.)
If you forged it, clean up the socket well.
Drill a 1/4" hardy hole in the anvil top and make the claw groove. Simplest way would be to hammer the caw closed in the shaping steps and then re-cut it with an 1/8" grinding disc.
Re-HT the hammer head at 1600 °F for a 15 minute soak. Quench in medium speed oil. Temper at 400°F for an hour, twice. Clean up on the grinder.
3) Forge the the end of the round bar so it fits the hammer head socket like a handle. When fitted, clean it up on the grinder. It should stick out just a little when snug.
Cut the excess rod off so the anvil will sit at the desired height from the base when assembled.
4) Drill a hole 1/16" less than the size of the round stock in the base plate/block. Grind the round rod with a 220 belt so it has a minute taper and can be driven home tight in the hole. Weld it in place if needed (doubtful). Grind the bottom of the base flat, if needed.
5) Clean up the base and set it on your regular anvil. Place the cutler's anvil on the post and tap down tight with a wooden mallet. Cut/grind/file the exposed shaft to 1/8" proud, and peen it down solid. Start by working the perimeter straight down on the end with the ball end of a 1-pound ball peen. It will enlarge to make the fit perfect. After it is as snug as you want, work the top down with the hammer end a bit. When happy with everything, file/grind the top flat and sand to 400 grit ... Make sure it is flat.
I might make one of these as a WIP thread. I just went out and looked around the shop. Hammer, block of steel, and piece of round WI took less than two minutes to find.
Look at this image and you will easily see where the cutlers anvil is hiding. (NOTE: image is an example, not my actual hammer)
