Hi Anthony

In response to your request for help on relief carving I
have the following suggestions for you.

1. use a 2" or better gage slab for your sub base. Apply
   a thin layer of plaster into which you set the
   carving piece . Now you got your self a sturdy
   reinforcement which is able to absorb vibration and
   shock from your mallet/ air tool.

2. Use a rubber or wood mallet for the hand work this
   further dampens the impact of your strokes . This
   method is typical for the marble /lime stone carving.
   Do not try to work your piece in  sand .  This is
   guarantied to fail since the marble will travel on
   this sub base. Sand sub bases do however have its
   place in a different application.

3. SHARP TOOLS ONLY !!!!!!!  How sharp do people ask me
   often. Well if you can slice into wood its perfect.
   Use a green wheel to sharpen carbide tipped tools.

All the best 
Reto Marti Stone Sculptor /Stone
Mason


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