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Figures (7)

1
1

In the center is the polished stainless steel mandrel. At the bottom is the mandrel with its nickel plate. At the top is the cylinder of nickel removed from the mandrel.

2
2

The nickel cone is still mounted on its arbor while being ground to a cylinder of two different diameters.

3
3

Many small external grooves are required. The part is shown with dividing head and carboloy end mill.

5
5

The completed cone still has the cylindrical outside resting on V-blocks ready for grinding half away.

6
6

The bottom half is still resting on the V-blocks. The pencil is pointing to the wax that filled the inside to protect it during the grinding process.

7
7

Because it is impossible to properly coat the internal surfaces, two exact halves were made. When assembled a very accurate complete internal cone was achieved.

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