The Mount Speed siltstone, has quite a nice grain pattern and I like the colour. Cuts fine with the diamond saw, dia. burrs and carbide burrs, if a bit slow smooth. I’ve learnt if you chisel hard on or near the grain angle it will split. As I have experience with cutting wheels and burrs it seems a bit unneccesary to learn to chisel. Maybe. We’ll wait on that.
Being too hot to work outside meant I could draw up the disc from a marble slab, and today I cut the design in. Using carbide burrs in the flex shaft, seems to work fine and now I’ve even cut out the centre hole. Not real quick but no hassle and carbide cuts fine, with good control.Water running over to keep the dust down, and there’s lots of it. Looking foreward to this, as the marble gets thin it becomes translucent. The light coming through is great.
The sandstone is showing me how diamond cutting wheels can be used on their side,a little, to shape and they leave a smoother surface than the cup grinding wheels. I’m going to try and get a 50mm wheel soon for the diegrinder or straight drill(stronger if slower).Some offcuts were left sitting in water over the hot days, and now they crumble fairly easily. SO the sculpture is soaking in water to see if it carves easier.

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