Figure 1. The disk is placed on locator pins as shown.


Figure 4. Each disk is represented by the average flatness (table 3), which gives the values for the recommended depth of cut.


Figure 2. Diagram of the measurements shown in table 1.


Table 4. Minimum and Maximum Flatness (in um) of Each Disk


Acknowledgements


Figure 3. Schematic diagram represents the values of Ra, Rz, and Flatness.


Experimental data found that for the industrially shot-blast, green sand disks it would be recommended to maintain a roughing cut of at least 0.037” (0.95mm from table 4). This means that even if a homogenous microstructure could be produced as-cast, using a fixed geometric dimension and tol- erancing targets will not improve position definition for the drag surface.


International Journal of Metalcasting/Winter 10


The author wishes to thank Defense Logistics Agency and Advanced Technology Institute for supporting the work under the castings for improved Defense Readiness Program. Thanks to William Peach and Jared Teague for guidance and support. Also thanks to faculty advisor Dr. Von Richards.


REFERENCES


1. ISO 8062-3:2007, Geometrical product specifications- Dimensional and geometrical tolerances for moulded parts- Part 3: General dimensional and geometrical tolerances and machining allowances for castings.


2. ASME Y14.43M-2003, Dimensioning and Tolerancing Principals For Gauges and Fixtures.


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