Suppose we want to cast an aluminum circular disc assembly with dimensions below. Each individual disc is 1" thick. Using NRL method, what should be the riser dimensions if a D:H = 1:1 is to be used. Using the computed riser dimensions, will shrinkage defects be predicted by the J.B. Caine method?

Question 1: What are the riser dimensions using the NRL method with a D:H = 1:1 ratio?

The riser dimensions should match the diameter of the disc, which is equal to the thickness (1") for a D:H ratio of 1:1, resulting in a riser that is 1" in diameter and 1" in height.

---

Question 2: Will shrinkage defects be predicted by the J.B. Caine method using the computed riser dimensions?

Yes, the J.B. Caine method predicts shrinkage defects if the riser does not provide sufficient metal to compensate for shrinkage during solidification; thus, further analysis of the specific casting conditions is necessary to confirm.