Question

A acceleration of 75g is used to produce a part in true centrifugal casting and the part has an inner diameter of 250 mm, outer diameter of 350 mm and length of 8 m. The rotational speed of the mold in RPM is

• A. 11.1
• B. 573.2
• C. 668.76
• D. 802.5

Answer 1

The correct option is C 668.76

$a=\overline{r}{\omega }^2\text{75g}=\frac{0.25+0.35}{4}\times {\omega }^2\omega =\text{70 rad/s}\text{N}=\frac{70\times 60}{2\pi }$

N = 668.7 rpm