33 dash machine turning size

What size are the machine swirls on a 33 dash? Anyone ever tried to match the factory look? If so, how did you do it? Dennis
 
this is a `32 instrument panel that i restored sometime ago. originally these panels were nickel plated, engine turned and then chrome plated. and that`s where the trouble starts- engine turning nickel is difficult the nickel wants to "smear" instead of "cut.
 

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FWIW I have always had great results with the Cratex abrasive sticks, but I never did anything nickel plated. I worked with an old German toolmaker years ago and when I showed him something I had damascened he said the old world method was olive oil and an abrasive powder used with a length of dowel rod. I wonder if that might help with the nickel.
 
Did this type of design Swirls; in school,years ago, we used a dowel 1/4", 3/8", or the size wanted , dipped in a small amount of oil,; dipped into the abrasive material;( grinding dust from the bench grinder,)or other abrasive material,Silica sand; from the hobby shop , a bit of oil wiped on the metal surface to be designed, worked quite well; but the trick was to get the swirls in a straight line, best to practice on a bit of scrap material first, OMHO..
 
If you have a mill you can mount the part to be turned count the turns to make the patern spaced,took about an hour to do My 33
 
you did a nice job on your turned instrument panel, by laying out the alignement marks was the key to a good job well done. Harold central coast Ca.
 
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